CN100575522C - Heat conductive magnesium alloy and preparation method thereof - Google Patents
Heat conductive magnesium alloy and preparation method thereof Download PDFInfo
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- CN100575522C CN100575522C CN200710121458A CN200710121458A CN100575522C CN 100575522 C CN100575522 C CN 100575522C CN 200710121458 A CN200710121458 A CN 200710121458A CN 200710121458 A CN200710121458 A CN 200710121458A CN 100575522 C CN100575522 C CN 100575522C
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Abstract
A kind of heat conductive magnesium alloy and preparation method thereof, the component content of this magnesium alloy is: the content of Zn is 1.5～11wt%, and the content of Cu is 0.5～5wt%, and the content of Mn is 0.15～1wt%, and the content of Ag is 0.1～2.5wt%, all the other are Mg.With pure Mg ingot, pure Zn ingot, electrolytic copper, electrolytic manganese or Cu-Mn master alloy, pure Ag ingot or Mg-Ag master alloy is raw material, pure magnesium ingot fusing, alloying; Make foundry goods, carry out solution treatment, ageing treatment; Or make billet, and carry out homogenizing thermal treatment, adopt rolling, extruding, drawing or forging process deformation processing to become sheet material, tubing, section bar, bar, wire rod or various forging, ageing treatment.Magnesium alloy of the present invention is under 20 ℃ of conditions, and thermal conductivity is greater than 120W. (m.K)
-1, tensile strength greater than 340MPa, yield strength greater than 320MPa.Can be as the power supply in the aerospace, the heat-removal system structured material of electron device.
Description
Technical field
The present invention relates to a kind of heat conductive magnesium alloy and preparation method thereof, belong to metal material field.
Background technology
The heat-removal system structured material of the power supply in the aerospace, electron device had both required good heat conductivility, must have also simultaneously that density is little, intensity is high.Therefore, high strength, high heat conductive magnesium alloy have important application background.
The thermal conductivity of pure magnesium is 1.55W. (m.K)
-1, intensity is approximately about 10MPa; After the alloying, intensity increases substantially, and thermal conductivity significantly reduces.For example according to U.S.'s magnesium and alloy handbook (ASM Specialty Handbook:Magnesium and magnesiumAlloys), contain the magnesium alloy AZ81 of aluminium, zinc, its tensile strength is 275Mpa, the thermal conductivity 20 ℃ the time is 51.1W. (m.K)
-1Magnesium-rare earth WE43, its intensity is 250Mpa, the thermal conductivity 20 ℃ the time is 51.3W. (m.K)
-1The magnesium alloy ZE41 that contains zinc, rare earth, its tensile strength is 205Mpa, the thermal conductivity 20 ℃ the time is 123.1W. (m.K)
-1The magnesium alloy ZC63 that contains zinc, copper, its tensile strength is 210Mpa, the thermal conductivity 20 ℃ the time is 122W. (m.K)
-1The magnesium alloy QE22 of argentiferous, rare earth, its tensile strength is 260Mpa, the thermal conductivity 20 ℃ the time is 113W. (m.K)
-1
Present existing magnesium alloy, thermal conductivity high such as ZE41, QE22, its intensity is all less than 265Mpa; And intensity higher such as AZ81, WE43, its thermal conductivity is all less than 55W. (m.K)
-1
Summary of the invention
The purpose of this invention is to provide a kind of thermal conductivity and intensity all than higher magnesium alloy, this magnesium alloy materials is under 20 ℃ of conditions, and thermal conductivity is greater than 120W. (m.K)
-1, tensile strength greater than 340Mpa, yield strength greater than 320Mpa.Can be as the power supply in the aerospace, the heat-removal system structured material of electron device.
Another object of the present invention provides a kind of thermal conductivity and intensity all than the preparation method of higher magnesium alloy.
For achieving the above object, the present invention takes following technical scheme:
A kind of heat conductive magnesium alloy, the component content of this magnesium alloy is: the content of Zn is 1.5～11wt%, and the content of Cu is 0.5～5wt%, and the content of Mn is 0.15～1wt%, and the content of Ag is 0.1～2.5wt%, all the other are Mg.
In heat conductive magnesium alloy of the present invention, the content of described Zn is preferably 3.5～6.5wt%.
In heat conductive magnesium alloy of the present invention, the content of described Cu is preferably 2～3.5wt%.
In heat conductive magnesium alloy of the present invention, the content of described Mn is preferably 0.3～0.75wt%.
In heat conductive magnesium alloy of the present invention, the content of described Ag is preferably 0.5～1.5wt%.
A kind of method for preparing heat conductive magnesium alloy of the present invention, this method comprises the steps:
(1), be raw material with pure magnesium ingot, pure Zn ingot, electrolytic copper, electrolytic manganese or Cu-Mn master alloy, pure Ag ingot or Mg-Ag master alloy, get the raw materials ready by the weight percent of the composition of above-mentioned magnesium alloy;
(2), with whole pure magnesium ingots with as far as possible closely mode pile up in the fusion crucible in smelting furnace, fusing fully under the protection of shielding gas, the magnesium melt temperature is controlled at 680～800 ℃, the scum silica frost of molten surface is cleaned out, feed shielding gas to smelting furnace;
(3), preheating oven is warmed up to 160～580 ℃, pure Zn ingot, electrolytic copper, electrolytic manganese or Cu-Mn master alloy, pure Ag ingot or Mg-Ag master alloy put into add charging basket, adding charging basket is that soft steel or high chromium steel are made, be thick with a large amount of apertures on it, above-mentioned raw materials is put into preheating oven together with the charging basket that adds that holds these raw materials, be preheating to 100～580 ℃;
(4), pure Zn ingot, electrolytic copper, electrolytic manganese or Cu-Mn master alloy with after the preheating, pure Ag ingot or Mg-Ag master alloy submerge in the magnesium melt together with the charging basket that adds that holds these raw materials, is convenient to the dissolving and the diffusion of Zn, electrolytic copper, electrolytic manganese or Cu-Mn master alloy, Ag or Mg-Ag master alloy;
(5), the magnesium melt temperature is controlled at 720～800 ℃, after treating that Zn, electrolytic copper, electrolytic manganese or Cu-Mn master alloy, Ag or Mg-Ag master alloy dissolve fully, taking-up adds charging basket, 730～800 ℃ of insulations 10～60 minutes, all alloying elements is evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, according to the composition of sample and content decision reinforced adjustment the whether, reaches the composition and the content of magnesium alloy of the present invention until the magnesium alloy liquation;
(6), the magnesium alloy liquation is poured in the permanent mold casting mould of abundant preheating or the sand mold casting mould and is frozen into foundry goods; Perhaps the magnesium alloy liquation is poured in extrusion casting machine or the pressure die-casting machine in batches extrusion casting or be cast into foundry goods according to casting weight; Perhaps adopt low-pressure casting process that casting of magnesium alloy is caused foundry goods;
(7), the foundry goods of above-mentioned steps preparation is carried out solution treatment, its solution treatment process is foundry goods to be heated to 350～500 ℃, insulation 3～30 hours, hardening;
(8), the foundry goods after the solution treatment is carried out ageing treatment, its timeliness treating processes is that foundry goods was heated to 155～235 ℃, insulation 2～36 hours.
The method for preparing heat conductive magnesium alloy of the present invention includes fusion process and last handling process, wherein, last handling process can be divided into two kinds: a kind of is that the foundry goods after the cast is carried out aftertreatment, another kind is that the billet after the cast is carried out aftertreatment, therefore, because of different last handling processes, the method for preparing heat conductive magnesium alloy of the present invention also is divided into two kinds, and the method for aforesaid preparation heat conductive magnesium alloy of the present invention is wherein a kind of, is the method for first kind of heat conductive magnesium alloy of the present invention.Second kind of method for preparing heat conductive magnesium alloy of the present invention is:
A kind of method for preparing heat conductive magnesium alloy of the present invention, wherein, step (1)-(5) of the fusion process and the method for first kind of heat conductive magnesium alloy of the present invention are identical, the Therefore, omited, its step (6)-(8) are:
(6), the magnesium alloy liquation is poured into is frozen into the billet of using for follow-up deformation processing in the permanent mold casting mould of abundant preheating or the sand mold casting mould, perhaps the magnesium alloy liquation is transported in the crystallizer, carry out continuous or semicontinuous casting, be prepared into the billet of using for follow-up deformation processing;
(7), the billet with the above-mentioned steps preparation carries out homogenizing thermal treatment, its homogenizing heat treatment process is that billet is heated to 350～500 ℃, is incubated 3～30 hours, directly adopt rolling, extruding, drawing or forging process deformation processing to become sheet material, tubing, section bar, bar, wire rod or various forging then, promptly adopt extruding or drawing process that the billet deformation processing is become bar or wire rod, or billet is processed into sheet material with rolling deformation, or adopt crimp that billet is processed into tubing or section bar, or adopt forging press that billet is forged into forging;
(8), sheet material, tubing, section bar, bar, wire rod or various forging that deformation processing is become carry out ageing treatment, its timeliness treating processes is that sheet material, tubing, section bar, bar, wire rod or various forging were heated to 155～235 ℃, insulation 2～36 hours.
In the method for preparation heat conductive magnesium alloy of the present invention; in described step (2); during pure magnesium ingot melts under the protection of shielding gas; be evenly to sprinkle SULPHUR POWDER in crucible bottom and pure magnesium ingot surface; the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion, and is with crucible cover that crucible is airtight, heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots, open crucible cover again.Wherein the consumption of SULPHUR POWDER can roughly be estimated as follows: the oxidizing fire reaction of sulphur is S+O
2=SO
2, the nucleidic mass of S and O
2Molecular weight all be 32, promptly material equates with the oxygen level in the external space in the consumption of SULPHUR POWDER and the crucible; Oxygen accounts for 1/5 greatly in air, and density of air is approximately 1 grams per liter: for example the space beyond the material is 200 liters in the crucible, and wherein oxygen is 40 liters, i.e. 40 grams, so the consumption of SULPHUR POWDER are 40 grams.In addition, the oxygen of small amount of residual or sulphur can be ignored the influence of magnesium alloy smelting.In actually operating,, calculate the space beyond the material in the crucible, and, calculate oxygen weight and SULPHUR POWDER weight according to the space beyond the material in the crucible according to the volume of crucible and the cumulative volume of pure magnesium ingot.
In the method for preparation heat conductive magnesium alloy of the present invention, in described step (2), the shielding gas that feeds to smelting furnace is preferably and contains 0.2～0.5 volume %SF
6N
2Be designated hereinafter simply as shielding gas (0.2～0.5%SF
6+ N
2).
Advantage of the present invention is: magnesium alloy of the present invention is under 20 ℃ of conditions, and thermal conductivity is greater than 120W. (m.K)
-1, tensile strength greater than 350Mpa, yield strength greater than 320Mpa.Can be as the power supply in the aerospace, the heat-removal system structured material of electron device.
Embodiment
Embodiment 1:1000 kilogram Mg-1.5Zn-5Cu-1Mn-2.5Ag heat conductive magnesium alloy (promptly the component content of this magnesium alloy is: 1.5wt%Zn, 5wt%Cu, 1wt%Mn, 2.5wt%Ag, surplus is Mg) and the plate rolling preparation method.
1, pure Zn ingot, electrolytic copper, Cu-Mn master alloy, the preheating of pure Ag ingot
Adopt preheating oven that 15 kilograms of pure Zn ingots, 40 kilograms of electrolytic coppers, 20 kilograms of Cu-50Mn master alloys (promptly the component content of this master alloy is: 50wt%Mn, surplus are Cu), 25 kilograms of pure Ag ingots are preheating to 550～580 ℃, wherein pure Zn ingot, electrolytic copper, Cu-50Mn master alloy, pure Ag ingot all are contained in and add in the charging basket, and above-mentioned raw materials is put into the preheating oven preheating together with the charging basket that adds that holds these raw materials.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
2, pure magnesium ingot fusing
With whole 900 kilograms of pure magnesium ingots with as far as possible closely mode pile up in fusion crucible, evenly sprinkle some SULPHUR POWDER in crucible bottom and pure magnesium ingot surface, the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion.With crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots; the magnesium melt temperature is controlled at 680～800 ℃; open crucible cover; the scum silica frost of molten surface is cleaned out, fed shielding gas (0.2～0.5%SF to smelting furnace
6+ N
2);
3, alloying
Pure Zn ingot after the preheating, electrolytic copper, Cu-50Mn master alloy, pure Ag ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that pure Zn ingot, electrolytic copper, Cu-Mn master alloy, pure Ag ingot dissolve fully, taking-up adds charging basket, 750～780 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, if composition and content are defective, the adjustment of can feeding in raw material is until qualified;
4, billet casting
With the melt transfer pump magnesium alloy liquation is transported in the crystallizer, carries out semicontinuous casting, be prepared into the billet of plate rolling processing usefulness.
5, homogenizing thermal treatment, plate rolling deformation processing and ageing treatment
The billet of above-mentioned steps preparation is carried out homogenizing thermal treatment, exactly billet is heated to 450～500 ℃, is incubated 26～30 hours, billet rolling deformation after directly adopting plate mill with homogenizing thermal treatment after coming out of the stove is processed into sheet material, then this sheet material is carried out ageing treatment, ageing treatment is heated to this sheet material 215～235 ℃ exactly, is incubated 2～5 hours.
Have following performance after Mg-1.5Zn-5Cu-1Mn-2.5Ag magnesium alloy process homogenizing of the present invention thermal treatment, plate rolling distortion and the ageing treatment: under 20 ℃ of conditions, thermal conductivity is approximately 125W. (m.K)
-1, tensile strength is that 360～370Mpa, yield strength are 320～330Mpa.
Embodiment 2:1000 kilogram Mg-11Zn-0.6Cu-0.15Mn-0.1Ag heat conductive magnesium alloy (promptly the component content of this magnesium alloy is: 11wt%Zn, 0.6wt%Cu, 0.15wt%Mn, 0.1wt%Ag, surplus is Mg) and the diecast parts preparation method.
1, pure Zn ingot, electrolytic copper, electrolytic manganese, the preheating of Mg-Ag master alloy
Adopt preheating oven that 110 kilograms of pure Zn ingots, 6 kilograms of electrolytic coppers, 1.5 kilograms of electrolytic manganeses, 5 kilograms of Mg-20Ag master alloys (promptly the component content of this master alloy is: 20wt%Ag, surplus are Mg) are preheating to 120～160 ℃, wherein pure Zn ingot, electrolytic copper, electrolytic manganese, Mg-Ag master alloy all are contained in and add in the charging basket, and above-mentioned raw materials is put into the preheating oven preheating together with the charging basket that adds that holds these raw materials.Add charging basket and adopt No. 20 thick boiler sheets of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
2, pure magnesium ingot fusing
With whole 877.5 kilograms of pure magnesium ingots with as far as possible closely mode pile up in fusion crucible, evenly sprinkle some SULPHUR POWDER in crucible bottom and pure magnesium ingot surface, the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion.With crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots; the magnesium melt temperature is controlled at 680～800 ℃; open crucible cover; the scum silica frost of molten surface is cleaned out, fed shielding gas (0.2～0.5%SF to smelting furnace
6+ N
2);
3, alloying
Pure Zn ingot after the preheating, electrolytic copper, electrolytic manganese, Mg-20Ag master alloy are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that pure Zn ingot, electrolytic copper, electrolytic manganese, Mg-Ag master alloy dissolve fully, taking-up adds charging basket, again 750～780 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt: afterwards, cast spectrum sample, carry out on-the-spot sample analysis, if composition and content are defective, the adjustment of can feeding in raw material is until qualified;
4, casting forming
Above-mentioned magnesium alloy melt temperature is controlled at 680～700 ℃, and is incubated; According to casting weight, with the melt quantitative shifting pump magnesium alloy liquation is poured in the pressure chamber of cold-chamber die casting machine in batches, be cast into foundry goods.
5, thermal treatment
Thermal treatment comprises solution treatment and ageing treatment; Solution treatment is exactly that foundry goods with above-mentioned steps die casting was heated to 350～380 ℃, insulation 25～28 hours, hardening; Then the foundry goods after the solution treatment is carried out ageing treatment, ageing treatment is heated to foundry goods 155～175 ℃ exactly, is incubated 32～36 hours.
Have following performance after Mg-11Zn-0.6Cu-0.15Mn-0.1Ag magnesium alloy process die cast of the present invention and the thermal treatment: under 20 ℃ of conditions, thermal conductivity is approximately 120W. (m.K)
-1, tensile strength is that 340～350Mpa, yield strength are greater than 320～325Mpa.
Embodiment 3:1000 kilogram Mg-3.5Zn-3.5Cu-0.3Mn-0.5Ag (promptly the component content of this magnesium alloy is: 3.5wt%Zn, 3.5wt%Cu, 0.3wt%Mn, 0.5wt%Ag, surplus is Mg) heat conductive magnesium alloy and bar, tubing, section bar or wire rod extruding production.
1, pure Zn ingot, electrolytic copper, Cu-Mn master alloy, the preheating of pure Ag ingot
Adopt preheating oven that 35 kilograms of pure Zn ingots, 32 kilograms of electrolytic coppers, 6 kilograms of Cu-50Mn master alloys (promptly the component content of this master alloy is: 50wt%Mn, surplus are Cu), 5 kilograms of pure Ag ingots are preheating to 260～360 ℃, wherein pure Zn ingot, electrolytic copper, Cu-50Mn master alloy, pure Ag ingot all are contained in and add in the charging basket, and above-mentioned raw materials is put into the preheating oven preheating together with the charging basket that adds that holds these raw materials.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
2, pure magnesium ingot fusing
With whole 922 kilograms of pure magnesium ingots with as far as possible closely mode pile up in fusion crucible, evenly sprinkle some SULPHUR POWDER in crucible bottom and pure magnesium ingot surface, the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion.With crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots; the magnesium melt temperature is controlled at 680～800 ℃; open crucible cover; the scum silica frost of molten surface is cleaned out, fed shielding gas (0.2～0.5%SF to smelting furnace
6+ N
2);
3, alloying
Pure Zn ingot after the preheating, electrolytic copper, Cu-50Mn master alloy, pure Ag ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that pure Zn ingot, electrolytic copper, Cu-Mn master alloy, pure Ag ingot dissolve fully, taking-up adds charging basket, 750～780 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, if composition and content are defective, the adjustment of can feeding in raw material is until qualified;
4, billet casting
The magnesium alloy liquation is poured into the billet that is frozen in the permanent mold casting mould of abundant preheating for follow-up crimp processing usefulness with the melt transfer pump.
5, the homogenizing thermal treatment of billet; The crimp processing of bar, tubing, section bar or wire rod and timeliness are handled
The billet of above-mentioned steps preparation is carried out homogenizing thermal treatment, exactly billet is heated to 410～430 ℃, is incubated 10～15 hours, bar, tubing, section bar or wire rod are processed in billet crimp after directly adopting extrusion machine with homogenizing thermal treatment after coming out of the stove, then this bar, tubing, section bar or wire rod are carried out ageing treatment, ageing treatment is heated to this bar, tubing, section bar or wire rod 180～200 ℃ exactly, is incubated 5～6 hours.
Mg-3.5Zn-3.5Cu-0.3Mn-0.5Ag magnesium alloy of the present invention is through homogenizing thermal treatment, and have following performance after bar, tubing, section bar or wire rod crimp processing and the ageing treatment: under 20 ℃ of conditions, thermal conductivity is approximately 127W. (m.K)
-1, tensile strength is that 350～355Mpa, yield strength are 320～325Mpa.
Embodiment 4:1000 kilogram Mg-4Zn-2Cu-0.75Mn-1.5Ag (promptly the component content of this magnesium alloy is: 4wt%Zn, 2wt%Cu, 0.75wt%Mn, 1.5wt%Ag, surplus is Mg) heat conductive magnesium alloy and part forging preparation method thereof.
1, pure Zn ingot, electrolytic copper, electrolytic manganese, the preheating of pure Ag ingot
Adopt preheating oven that 40 kilograms of pure Zn ingots, 20 kilograms of electrolytic coppers, 7.5 kilograms of electrolytic manganeses, 15 kilograms of pure Ag ingots are preheating to 260～360 ℃, wherein pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot all are contained in and add in the charging basket, and above-mentioned raw materials is put into the preheating oven preheating together with the charging basket that adds that holds these raw materials.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
2, pure magnesium ingot fusing
With whole 917.5 kilograms of pure magnesium ingots with as far as possible closely mode pile up in fusion crucible, evenly sprinkle some SULPHUR POWDER in crucible bottom and pure magnesium ingot surface, the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion.With crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots; the magnesium melt temperature is controlled at 680～800 ℃; open crucible cover; the scum silica frost of molten surface is cleaned out, fed shielding gas (0.2～0.5%SF to smelting furnace
6+ N
2);
3, alloying
Pure Zn ingot after the preheating, electrolytic copper, electrolytic manganese, pure Ag ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot dissolve fully, taking-up adds charging basket, 750～780 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, if composition and content are defective, the adjustment of can feeding in raw material is until qualified;
4, billet casting
The magnesium alloy liquation is poured into the billet that is frozen in the sand mold casting mould for follow-up forging deformation processing usefulness with the melt transfer pump.
5, homogenizing thermal treatment, the processing of part forging deformation and ageing treatment
The billet of above-mentioned steps preparation is carried out homogenizing thermal treatment, exactly billet is heated to 435～460 ℃, is incubated 15～17 hours, billet forging deformation after directly adopting forging press with homogenizing thermal treatment after coming out of the stove is processed into part, then this part is carried out ageing treatment, ageing treatment is heated to this part 190～210 ℃ exactly, is incubated 7～9 hours.
Have following performance after Mg-4Zn-2Cu-0.75Mn-1.5Ag magnesium alloy process homogenizing of the present invention thermal treatment, the processing of part forging deformation and the ageing treatment: under 20 ℃ of conditions, thermal conductivity is approximately 125W. (m.K)
-1, tensile strength is that 355～365Mpa, yield strength are 325～335Mpa.
Embodiment 5:1000 kilogram Mg-4.5Zn-2.5Cu-0.5Mn-1Ag (promptly the component content of this magnesium alloy is: 4.5wt%Zn, 2.5wt%Cu, 0.5wt%Mn, 1wt%Ag, surplus is Mg) heat conductive magnesium alloy and bar or wire rod extruding and drawing preparation method.
1, pure Zn ingot, electrolytic copper, electrolytic manganese, the preheating of pure Ag ingot
Adopt preheating oven that 45 kilograms of pure Zn ingots, 25 kilograms of electrolytic coppers, 5 kilograms of electrolytic manganeses, 10 kilograms of pure Ag ingots are preheating to 260～360 ℃, wherein pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot all are contained in and add in the charging basket, and above-mentioned raw materials is put into the preheating oven preheating together with the charging basket that adds that holds these raw materials.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
2, pure magnesium ingot fusing
With whole 915 kilograms of pure magnesium ingots with as far as possible closely mode pile up in fusion crucible, evenly sprinkle some SULPHUR POWDER in crucible bottom and pure magnesium ingot surface, the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion.With crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots; the magnesium melt temperature is controlled at 680～800 ℃; open crucible cover; the scum silica frost of molten surface is cleaned out, fed shielding gas (0.2～0.5%SF to smelting furnace
6+ N
2);
3, alloying
Pure Zn ingot after the preheating, electrolytic copper, electrolytic manganese, pure Ag ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot dissolve fully, taking-up adds charging basket, 750～780 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, if composition and content are defective, the adjustment of can feeding in raw material is until qualified;
4, billet casting
The magnesium alloy liquation is poured into the billet that is frozen in the permanent mold casting mould of abundant preheating for follow-up crimp processing usefulness with the melt transfer pump.
5, homogenizing thermal treatment, bar or wire rod extruding are handled with drawing deformation processing and timeliness
The billet of above-mentioned steps preparation is carried out homogenizing thermal treatment, exactly billet is heated to 425～450 ℃, is incubated 10～15 hours, bar or wire rod are processed in billet crimp after directly adopting extrusion machine with homogenizing thermal treatment after coming out of the stove, and then adopt cold drawing bench that this bar or wire rod are carried out drawing deformation to be processed into littler bar of diameter or wire rod, at last this bar or wire rod are carried out ageing treatment, ageing treatment is heated to this bar or wire rod 180～200 ℃, is incubated 5～6 hours exactly.
Have following performance after Mg-4.5Zn-2.5Cu-0.5Mn-1Ag heat conductive magnesium alloy process homogenizing of the present invention thermal treatment, bar or wire rod extruding and drawing deformation processing and the ageing treatment: under 20 ℃ of conditions, thermal conductivity is approximately 123W. (m.K)
-1, tensile strength is that 380～400Mpa, yield strength are 370～390Mpa.
Embodiment 6:1000 kilogram Mg-6.5Zn-3Cu-0.6Mn-0.5Ag (promptly the component content of this magnesium alloy is: 6.5wt%Zn, 3wt%Cu, 0.6wt%Mn, 0.5wt%Ag, surplus is Mg) heat conductive magnesium alloy and and extrusion casting part preparation method thereof.
1, pure Zn ingot, electrolytic copper, electrolytic manganese, the preheating of pure Ag ingot
Adopt preheating oven that 65 kilograms of pure Zn ingots, 30 kilograms of electrolytic coppers, 6 kilograms of electrolytic manganeses, 5 kilograms of pure Ag ingots are preheating to 260～360 ℃, wherein pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot all are contained in and add in the charging basket, and above-mentioned raw materials is put into the preheating oven preheating together with the charging basket that adds that holds these raw materials.Add charging basket and adopt No. 20 thick boiler sheets of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
2, pure magnesium ingot fusing
With whole 894 kilograms of pure magnesium ingots with as far as possible closely mode pile up in fusion crucible, evenly sprinkle some SULPHUR POWDER in crucible bottom and pure magnesium ingot surface, the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion.With crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots; the magnesium melt temperature is controlled at 680～800 ℃; open crucible cover; the scum silica frost of molten surface is cleaned out, fed shielding gas (0.2～0.5%SF to smelting furnace
6+ N
2);
3, alloying
Pure Zn ingot after the preheating, electrolytic copper, electrolytic manganese, pure Ag ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot dissolve fully, taking-up adds charging basket, 750～780 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, if composition and content are defective, the adjustment of can feeding in raw material is until qualified;
4, extrusion casting is shaped
Above-mentioned magnesium alloy melt temperature is controlled at 680～700 ℃, and is incubated; According to casting weight, with the melt quantitative shifting pump magnesium alloy liquation is poured in the pressure chamber of extrusion casting machine in batches, extrusion casting becomes foundry goods.
5, thermal treatment
Thermal treatment comprises solution treatment and ageing treatment; Solution treatment is exactly that foundry goods with above-mentioned steps extrusion casting was heated to 395～420 ℃, insulation 27～29 hours, hardening; Then the foundry goods after the solution treatment is carried out ageing treatment, ageing treatment is heated to foundry goods 165～180 ℃ exactly, is incubated 32～36 hours.
Have following performance after Mg-6.5Zn-3Cu-0.6Mn-0.5Ag magnesium alloy process extrusion casting moulding of the present invention and the thermal treatment: under 20 ℃ of conditions, thermal conductivity is approximately 121W. (m.K)
-1, tensile strength is that 340～350Mpa, yield strength are 320～325Mpa.
Embodiment 7:1000 kilogram Mg-5Zn-3.5Cu-0.4Mn-0.5Ag (promptly the component content of this magnesium alloy is: 5wt%Zn, 3.5wt%Cu, 0.4wt%Mn, 0.5wt%Ag, surplus is Mg) heat conductive magnesium alloy and and low-pressure casting part preparation method thereof.
1, pure Zn ingot, electrolytic copper, electrolytic manganese, the preheating of pure Ag ingot
Adopt preheating oven that 50 kilograms of pure Zn ingots, 35 kilograms of electrolytic coppers, 4 kilograms of electrolytic manganeses, 5 kilograms of pure Ag ingots are preheating to 260～360 ℃, wherein pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot all are contained in and add in the charging basket, and above-mentioned raw materials is put into the preheating oven preheating together with the charging basket that adds that holds these raw materials.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
2, pure magnesium ingot fusing
With whole 906 kilograms of pure magnesium ingots with as far as possible closely mode pile up in fusion crucible, evenly sprinkle some SULPHUR POWDER in crucible bottom and pure magnesium ingot surface, the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion.With crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots; the magnesium melt temperature is controlled at 680～800 ℃; open crucible cover; the scum silica frost of molten surface is cleaned out, fed shielding gas (0.2～0.5%SF to smelting furnace
6+ N
2);
3, alloying
Pure Zn ingot after the preheating, electrolytic copper, electrolytic manganese, pure Ag ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that pure Zn ingot, electrolytic copper, electrolytic manganese, pure Ag ingot dissolve fully, taking-up adds charging basket, 750～780 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, if composition and content are defective, the adjustment of can feeding in raw material is until qualified;
4, low-pressure casting is shaped
With the melt transfer pump magnesium alloy liquation of above-mentioned steps melting is transferred in the crucible of air injection machine holding furnace, the magnesium alloy melt temperature is controlled at 680～700 ℃, and is incubated, low-pressure casting becomes foundry goods.
5, thermal treatment
Thermal treatment comprises solution treatment and ageing treatment; Solution treatment is exactly that foundry goods with the above-mentioned steps low-pressure casting was heated to 435～460 ℃, insulation 28～30 hours, hardening; Then the foundry goods after the solution treatment is carried out ageing treatment, ageing treatment is heated to foundry goods 165～180 ℃ exactly, is incubated 32～36 hours.
Have following performance after Mg-5Zn-3.5Cu-0.4Mn-0.5Ag magnesium alloy process low-pressure casting moulding of the present invention and the thermal treatment: under 20 ℃ of conditions, thermal conductivity is approximately 121W. (m.K)
-1, tensile strength is that 340～350Mpa, yield strength are 320～325Mpa.
Claims (9)
1, a kind of heat conductive magnesium alloy is characterized in that: the component content of this magnesium alloy is: the content of Zn is 1.5～11wt%, and the content of Cu is 0.5～5wt%, and the content of Mn is 0.15～1wt%, and the content of Ag is 0.1～2.5wt%, and all the other are Mg.
2, heat conductive magnesium alloy according to claim 1 is characterized in that: the content of described Zn is 3.5～6.5wt%.
3, heat conductive magnesium alloy according to claim 1 and 2 is characterized in that: the content of described Cu is 2～3.5wt%.
4, heat conductive magnesium alloy according to claim 3 is characterized in that: the content of described Mn is 0.3～0.75wt%.
5, heat conductive magnesium alloy according to claim 4 is characterized in that: the content of described Ag is 0.5～1.5wt%.
6, a kind of method for preparing heat conductive magnesium alloy, this method comprises the steps:
(1), be raw material with a kind of in a kind of and pure Ag ingot in pure magnesium ingot, pure Zn ingot, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy and the Mg-Ag master alloy, get the raw materials ready by the weight percent of the composition of the described magnesium alloy of claim 1;
(2), pure magnesium ingot is piled up in the fusion crucible in smelting furnace, fusing fully is controlled at 680～800 ℃ with the magnesium melt temperature under the protection of shielding gas, the scum silica frost of molten surface is cleaned out, and fed shielding gas to smelting furnace;
(3), preheating oven is warmed up to 160～580 ℃, a kind of and pure Ag ingot in pure Zn ingot, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy and a kind of the putting in the Mg-Ag master alloy are added charging basket, adding charging basket is that soft steel or high chromium steel are made, be thick with a large amount of apertures on it, above-mentioned raw materials is put into preheating oven together with the charging basket that adds that holds these raw materials, be preheating to 100～580 ℃;
(4), a kind of in a kind of and pure Ag ingot in pure Zn ingot, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy after the preheating and the Mg-Ag master alloy submerged in the magnesium melt together with the charging basket that adds that holds these raw materials, be convenient to a kind of and Ag in Zn, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy and a kind of dissolving and the diffusion in the Mg-Ag master alloy;
(5), the magnesium melt temperature is controlled at 720～860 ℃, after treating that a kind of and Ag in Zn, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy and Mg-Ag master alloy dissolve fully, taking-up adds charging basket, 750～860 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, according to the composition of sample and content decision reinforced adjustment the whether, reaches the composition and the content of the described magnesium alloy of claim 1 until the magnesium alloy liquation;
(6), the magnesium alloy liquation is poured in the permanent mold casting mould of preheating or the sand mold casting mould and is frozen into foundry goods; Perhaps the magnesium alloy liquation is poured in extrusion casting machine or the pressure die-casting machine in batches extrusion casting or be cast into foundry goods according to casting weight; Perhaps adopt low-pressure casting process that the magnesium alloy liquation is cast as foundry goods;
(7), the foundry goods of above-mentioned steps preparation is carried out solution treatment, its solution treatment process is foundry goods to be heated to 350～500 ℃, insulation 3～30 hours, hardening;
(8), the foundry goods after the solution treatment is carried out ageing treatment, its timeliness treating processes is that foundry goods was heated to 155～235 ℃, insulation 2～36 hours.
7, a kind of method for preparing heat conductive magnesium alloy, this method comprises the steps:
(1), be raw material with a kind of in a kind of and pure Ag ingot in pure magnesium ingot, pure Zn ingot, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy and the Mg-Ag master alloy, get the raw materials ready by the weight percent of the composition of the described magnesium alloy of claim 1;
(2), pure magnesium ingot is piled up in the fusion crucible in smelting furnace, fusing fully is controlled at 680～800 ℃ with the magnesium melt temperature under the protection of shielding gas, the scum silica frost of molten surface is cleaned out, and fed shielding gas to smelting furnace;
(3), preheating oven is warmed up to 160～580 ℃, a kind of and pure Ag ingot in pure Zn ingot, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy and a kind of the putting in the Mg-Ag master alloy are added charging basket, adding charging basket is that soft steel or high chromium steel are made, be thick with a large amount of apertures on it, above-mentioned raw materials is put into preheating oven together with the charging basket that adds that holds these raw materials, be preheating to 100～580 ℃;
(4), a kind of in a kind of and pure Ag ingot in pure Zn ingot, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy after the preheating and the Mg-Ag master alloy submerged in the magnesium melt together with the charging basket that adds that holds these raw materials, be convenient to a kind of and Ag in Zn, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy and a kind of dissolving and the diffusion in the Mg-Ag master alloy;
(5), the magnesium melt temperature is controlled at 720～860 ℃, after treating a kind of and Ag and a kind of dissolving fully in the Mg-Ag master alloy in Zn, electrolytic copper, electrolytic manganese and the Cu-Mn master alloy, taking-up adds charging basket, 750～860 ℃ of insulations 10～60 minutes, all alloying elements are evenly distributed in the magnesium melt again; Afterwards, cast spectrum sample carries out on-the-spot sample analysis, according to the composition of sample and content decision reinforced adjustment the whether, reaches the composition and the content of the described magnesium alloy of claim 1 until the magnesium alloy liquation;
(6), the magnesium alloy liquation is poured into is frozen into the billet of using for follow-up deformation processing in the permanent mold casting mould of preheating or the sand mold casting mould, perhaps the magnesium alloy liquation is transported in the crystallizer, carry out continuous or semicontinuous casting, be prepared into the billet of using for follow-up deformation processing;
(7), the billet with the above-mentioned steps preparation carries out homogenizing thermal treatment, its homogenizing heat treatment process is that billet is heated to 350～500 ℃, is incubated 3～30 hours, directly adopt rolling, extruding, drawing or forging process deformation processing to become sheet material, tubing, section bar, bar, wire rod or various forging then, promptly adopt extruding or drawing process that the billet deformation processing is become bar or wire rod, or billet is processed into sheet material with rolling deformation, or adopt crimp that billet is processed into tubing or section bar, or adopt forging press that billet is forged into forging;
(8), sheet material, tubing, section bar, bar, wire rod or various forging that deformation processing is become carry out ageing treatment, its timeliness treating processes is that sheet material, tubing, section bar, bar, wire rod or various forging were heated to 155～235 ℃, insulation 2～36 hours.
8, according to claim 6 or the 7 described methods that prepare heat conductive magnesium alloy; it is characterized in that: in described step (2); pure magnesium ingot melts under the protection of shielding gas; be evenly to sprinkle SULPHUR POWDER in crucible bottom and pure magnesium ingot surface; the amount of SULPHUR POWDER can all change into sulfurous gas with the oxygen in the crucible after with oxidizing fire and be as the criterion; with crucible cover that crucible is airtight; heat temperature raising; make the fusing fully under the remaining protection of nitrogen gas of sulfurous gas and burning back of whole pure magnesium ingots, open crucible cover again.
9, the method for preparing heat conductive magnesium alloy according to claim 8 is characterized in that: in described step (2), the shielding gas that feeds to smelting furnace is for containing 0.2～0.5 volume %SF
6N
2
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| CN103981415B (en) * | 2014-05-09 | 2016-06-15 | 曹帅 | A kind of high damping magnesio noiseless alloy and preparation method thereof |
| CN106756366B (en) * | 2017-01-23 | 2018-05-08 | 重庆大学 | A kind of preparation method of high-strength high-plasticity magnesium zinc-manganese yittrium alloy |
| CN107164676B (en) * | 2017-05-12 | 2018-06-19 | 重庆大学 | A kind of Low-cost wrought magnesium alloy with less anisotropy and preparation method thereof |
| CN107164672B (en) * | 2017-05-18 | 2019-10-22 | 万丰奥特控股集团有限公司 | A kind of super-high heat-conductive magnesium alloy |
| GB2583482A (en) | 2019-04-29 | 2020-11-04 | Univ Brunel | A casting magnesium alloy for providing improved thermal conductivity |
| CN111455244B (en) * | 2020-04-24 | 2021-07-20 | 山西恒镁新材料科技有限公司 | Magnesium alloy |
| CN113881879A (en) * | 2021-09-27 | 2022-01-04 | 中北大学 | Preparation method of magnesium-zinc alloy plate |
| CN114459849B (en) * | 2021-12-22 | 2023-08-25 | 西南交通大学 | Preparation method and test method of high-strength rare earth magnesium alloy |
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