CN108359976A - A method of for reducing laser melting coating alumina base composite coating crackle - Google Patents
A method of for reducing laser melting coating alumina base composite coating crackle Download PDFInfo
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- CN108359976A CN108359976A CN201810314074.0A CN201810314074A CN108359976A CN 108359976 A CN108359976 A CN 108359976A CN 201810314074 A CN201810314074 A CN 201810314074A CN 108359976 A CN108359976 A CN 108359976A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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Abstract
The invention discloses a kind of methods for reducing laser melting coating alumina base composite coating crackle, and laser melting coating powder is preset in matrix surface, laser melting coating is carried out under argon atmosphere, obtain the alumina base composite coating that thickness is 0.3 0.6mm；Including：Substrate pretreated, configuration laser melting coating powder, fore-put powder and laser melting coating process；Laser melting coating powder is by mass percentage：Al2O356 72%, TiO214 18%, WC10 30%, wherein Al2O3Granularity is 20 50 μm, and laser melting coating power is 1000 2000W；The present invention forms good metallurgical binding by the way that appropriate WC, obtained alumina base composite coating dense structure, uniform and flawless is added with metal base；And process control easy to automate, it is efficient, pollution-free and at low cost, there is ideal engineering application value.
Description
Technical field
The invention belongs to laser melting and coating technique fields, are related to one kind and are split for reducing laser melting coating alumina base composite coating
The method of line.
Background technology
Laser melting and coating technique is widely used in the table of metal and alloy because of its processing time is short, flexibility and performance accuracy height
Face is modified and the directly manufacture and reparation of complex parts.But though the local heating of laser beam can preferably keep base material
Property, but many defects such as crackle, stomata and coarse columnar grain etc. are easy tod produce during laser cladding forming, and due to
Laser melting coating is the process of a rapid heating and cooling, and cooling velocity is too fast will to cause coating to generate larger residual stress, processed
These residual stress and defect seriously affect the mechanical property of drip molding in journey, even result in the macroscopic view cracking of drip molding.
In the prior art, the Chinese patent of publication number 106048599A discloses the crackle of laser cladding forming metal parts
Control method improves cladding forming tissue, reduction and the technique for eliminating crackle by introducing ultrasonic vibration, and cladding layer material is
Co-based alloy powder Ni60, basis material are 45 steel, using 3KW crossing currents CO2Laser carries out laser melting coating, draws in forming process
Enter ultrasonic vibration installation, vibration frequency 25KHz；Ni base composite coating prepared by this method is needed without apparent crackle to molten
Pond temperature carries out closed-loop control and introduces ultrasonic vibration, is affected by extraneous factor in cladding process.Publication number
The Chinese patent of 105506615A discloses a kind of incident angle control laser cladding coating microstructure by changing laser
And the method for fire check sensibility.In laser cladding process, rotating laser head, changing laser incident angle makes Pool and temperature
Degree field changes, and microstructure, the orientation of growth and the anti-crack splitting resistance of cladding coating is caused to change, this method behaviour
Make simple but higher to the required precision of laser incident angle.
Invention content
It is a kind of for reducing laser melting coating alumina base present invention aims in view of the above shortcomings of the prior art, providing
The method of composite coating crackle.
To realize the above-mentioned technical purpose, the present invention adopts the following technical scheme that：
A method of for reducing laser melting coating alumina base composite coating crackle, laser melting coating powder being preset in base
Body surface face carries out laser melting coating under argon atmosphere, obtains alumina base composite coating；Including：Substrate pretreated, configuration swash
Light cladding powder, fore-put powder and laser melting coating process；The laser melting coating powder is by mass percentage：Al2O356-
72%, TiO214-18%, WC10-30%, wherein Al2O3Granularity is 20-50 μm；And the laser melting coating power is 1000-
The thickness of 2000W, the alumina base composite coating are 0.3-0.6mm.
In some preferred embodiments, the thickness of above-mentioned alumina base composite coating is 0.4-0.6mm；More preferably
, the thickness of the alumina base composite coating is 0.5mm.
Further, described matrix is Ti-6Al-4V (TC4) alloy sheets.
Further, the laser melting coating powder passes through ball milling Style of mixing powder；Wherein, ratio of grinding media to material 10:1, Ball-milling Time
For 3h, rotating speed 300rpm.
Further, the fore-put powder process is：Laser melting coating powder after ball milling is pressed into quality volume with binder
Than for (9-14):3-7 (g/mL) is mixed, and described matrix surface, smooth compacting and vacuum are evenly applied to after stirring evenly
Drying；The coating layer thickness is 0.8-1mm.In some preferred embodiments, bonding agent is cellulose acetate and dipropyl
Keto-alcohol is 1 by mass volume ratio:The mixture of 25 (g/mL), and the diacetone alcohol is to analyze pure AR.
Further, the laser melting and coating process is：Using IPG-YLS-5000 type optical fiber lasers, laser melting coating power
Conveying speed for 1500-2000W, sweep speed 600mm/min, defocusing amount 60mm, the argon gas is 5L/min, purity
It is 99.99%.
Compared with prior art, the beneficial effects of the present invention are：
One, it is nano level ball milling mixing powder using granularity, by the way that appropriate WC is added, obtained alumina base is compound
Coating structure densification, uniform and flawless, good metallurgical binding is formed with metal base.
Two, compared with prior art, the method for the present invention can effectively improve the hardness of coating, and can effectively reduce coating and split
Line, whole process control easy to automate is efficient, pollution-free and at low cost, has ideal engineer application valence
Value.
Description of the drawings
Fig. 1 is the SEM photograph of laser melting coating alumina base composite coating cross section in embodiment 6.
Specific implementation mode
With reference to specific embodiment, the present invention is further explained.
Comparative example
Laser melting coating side is used on Ti-6Al-4V (TC4) the titanium alloy sheets surface of 60 (length) × 60 (width) × 10 (thickness) mm
Method prepares alumina base composite coating, is as follows：
1, titanium alloy sheet surface activation process
Polishing roughening treatment is carried out with 100# coarse sandpapers to the titanium alloy sheet surface that thickness is 10mm or uses sand-blasting machine
Surface sand-blasting process removes surface oxide layer and spot, to enhance the combination of titanium alloy surface and alumina base composite cladding layer,
Then it is cleaned with alcohol and acetone, is dried in drying box.
2, laser melting coating powder is prepared
Laser melting coating powder is prepared by following mass percents：80%Al2O3, 20%TiO2, mixed-powder is in the ball mill
Ball milling 3 hours.
3, fore-put powder
Above-mentioned mixed-powder is preset to using fore-put powder method on substrate, the technique of fore-put powder method is as follows：It will mixing
Powder is mixed into paste with bonding agent, after being mixed evenly, is coated uniformly on the surface for waiting for cladding workpiece, carries out compacting and table
Face physics is smooth, and coating thickness 0.8-1mm is finally dried in vacuum drying chamber.
4, laser melting coating prepares alumina base composite coating
The titanium alloy handled well is placed on Laser platform, starts robot and controls laser melting coating, wherein laser melting coating
Technological parameter is：Fibre laser power is 1000W, sweep speed 600mm/min, defocusing amount 60mm, argon gas conveying speed
For 5L/min, alumina base composite coating is obtained.
By test, above-mentioned alumina base composite coating macroscopically has more fine cracks, coating layer thickness 0.2-
0.4mm, coating structure is coarse, has increased number of stomata and crackle, average hardness 684.5HV0.3, the hardness with titanium alloy substrate
380HV0.3Compared to higher.
Embodiment 1
The present embodiment is essentially identical with comparative example, except that laser melting coating powder is by mass percentage in the present embodiment
It is calculated as：Al2O372%, TiO218%, WC10%, wherein Al2O3Granularity is 20-50 μm.Compared with comparative example, in embodiment 1
The WC of addition 10%, for the alumina base composite coating of preparation macroscopically without apparent crackle, coating structure is uniform, withe crystalline substance group occurs
It knits, stomata and crackle significantly reduce, and coating average hardness is 1099.6HV0.3。
Embodiment 2
The present embodiment is substantially the same manner as Example 1, except that laser melting coating powder presses quality percentage in the present embodiment
Than being calculated as：Al2O364%, TiO216%, WC20%, wherein Al2O3Granularity is 30 μm.Compared with comparative example, add in embodiment 2
20% WC, the alumina base composite coating of preparation is added macroscopically to be molded preferably, coating structure refinement, isometric crystalline tissue density
Increase, pore-free, almost eliminate crackle, coating average hardness is 1132.8HV0.3, compared with matrix, hardness improves about 2
Times.
Embodiment 3
The present embodiment is substantially the same manner as Example 1, except that laser melting coating powder presses quality percentage in the present embodiment
Than being calculated as：Al2O356%, TiO214%, WC30%, wherein Al2O3Granularity is 50 μm.Compared with comparative example, add in embodiment 3
30% WC, the alumina base composite coating of preparation is added macroscopically to be molded preferably, coating structure more refines, but a little gas occurs
Hole, without apparent crackle, coating average hardness is 1203.8HV0.3。
Embodiment 4
The present embodiment is essentially identical with comparative example, except that laser power is 1500W in the present embodiment, other experiments
Condition is identical.Compared with comparative example, laser power is 1500W in embodiment 4, and the alumina base composite coating of preparation macroscopically has
More tiny crackle, coating layer thickness 0.3-0.5mm, coating structure refinement have a little stomata and crackle, coating average hardness
For 818.1HV0.3, compared with matrix, hardness improves about 1 times.
Embodiment 5
The present embodiment is substantially the same manner as Example 1, except that laser power is 1500W, other realities in the present embodiment
It is identical to test condition.Compared with comparative example, laser power is 1500W in embodiment 5, and the alumina base composite coating of preparation is macroscopically
Crackle significantly reduces, and withe crystalline substance occurs in coating, and tissue more refines, and has a little stomata and a small amount of crackle, coating average hardness to be
1163.7HV0.3。
Embodiment 6
The present embodiment is substantially the same manner as Example 2, except that laser power is 1500W, other realities in the present embodiment
It is identical to test condition.Compared with comparative example, laser power is 1500W in embodiment 6, and the alumina base composite coating of preparation is macroscopically
Flawless, the isometric crystalline tissue density of coating increase, and structure refinement, pore-free and crackle, coating average hardness are
1205.1HV0.3。
Embodiment 7
The present embodiment is substantially the same manner as Example 3, except that laser power is 1500W, other realities in the present embodiment
It is identical to test condition.Compared with comparative example, laser power is 1500W in embodiment 7, and the alumina base composite coating of preparation is macroscopically
Without apparent crackle, coating structure more refines, and eliminates stomata and crackle, and coating average hardness is 1277.9HV0.3。
Embodiment 8
The present embodiment is essentially identical with comparative example, except that laser power is 2000W in the present embodiment, other experiments
Condition is identical.Compared with comparative example, laser power is 2000W in the present embodiment, and the alumina base composite coating of preparation is macroscopically
There is a small amount of tiny crackle, coating layer thickness 0.4-0.6mm occurs that a small amount of withe is brilliant, and tissue more refines in coating, has a little
Crackle and stomata, coating average hardness are 1048.1HV0.3。
Embodiment 9
The present embodiment is substantially the same manner as Example 1, except that laser power is 2000W, other realities in the present embodiment
It is identical to test condition.Compared with comparative example, laser power is 2000W, the alumina base composite coating macroscopic view of preparation in the present embodiment
The morning apparent crackle, coating withe is crystalline, and tissue density increases, and structure refinement has a little crackle and stomata, coating average hardness
For 1213.5HV0.3, compared with matrix, hardness improves more than 2 times.
Embodiment 10
The present embodiment is substantially the same manner as Example 2, except that laser power is 2000W, other realities in the present embodiment
It is identical to test condition.Compared with comparative example, laser power is 2000W, the alumina base composite coating macroscopic view of preparation in the present embodiment
Upper flawless, Forming Quality is preferable, and the isometric crystalline tissue density of coating increases, structure refinement, eliminates crackle, and coating is average hard
Degree is 1298.5HV0.3, compared with matrix, hardness improves more than 2 times.
Embodiment 11
The present embodiment is substantially the same manner as Example 3, except that laser power is 2000W, other realities in the present embodiment
It is identical to test condition.Compared with comparative example, laser power is 2000W, the alumina base composite coating macroscopic view of preparation in the present embodiment
Upper flawless, coating structure more refine, and eliminate crackle, and coating average hardness is 1344.0HV0.3, compared with matrix, hardness
It improves more than 2 times.
Technical scheme of the present invention and advantageous effect is described in detail in embodiment described above, it should be understood that
Above is only a specific embodiment of the present invention, it is not intended to restrict the invention, it is all to be done in the spirit of the present invention
Any modification and improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for reducing laser melting coating alumina base composite coating crackle, which is characterized in that by laser cladding powder
Body is preset in matrix surface, and laser melting coating is carried out under argon atmosphere, obtains alumina base composite coating；Including：Matrix is pre-
Processing, configuration laser melting coating powder, fore-put powder and laser melting coating process；The laser melting coating powder is by mass percentage
For：Al2O356-72%, TiO214-18%, WC10-30%, wherein the Al2O3Granularity is 20-50 μm；And the laser
Cladding power is 1000-2000W, and the thickness of the alumina base composite coating is 0.3-0.6mm.
2. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as described in claim 1 exist
In the thickness of the alumina base composite coating is 0.4-0.6mm.
3. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as claimed in claim 2 exist
In the thickness of the alumina base composite coating is 0.5mm.
4. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as described in claim 1 exist
In described matrix is Ti-6Al-4V (TC4) alloy sheets.
5. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as described in claim 1 exist
In the laser melting coating powder passes through ball milling Style of mixing powder；Wherein, ratio of grinding media to material 10:1, Ball-milling Time 3h, rotating speed are
300rpm。
6. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as described in claim 1 exist
In the fore-put powder process is：It is evenly applied to after laser melting coating powder after ball milling is mixed evenly with binder
Described matrix surface, smooth compacting and vacuum drying.
7. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as claimed in claim 6 exist
In the mass volume ratio of the laser melting coating powder and binder is (9-14):3-7.
8. a kind of method for being used to reduce laser melting coating alumina base composite coating crackle as claimed in claims 6 or 7, feature
It is, the bonding agent is that mass volume ratio is 1:25 cellulose acetate and the mixture of diacetone alcohol, and two acetone
Alcohol is to analyze pure AR.
9. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as described in claim 1 exist
In the coating layer thickness is 0.8-1mm.
10. a kind of method for reducing laser melting coating alumina base composite coating crackle, feature as described in claim 1 exist
In the laser melting and coating process is：Using IPG-YLS-5000 type optical fiber lasers, laser melting coating power is 1500-2000W,
Sweep speed is 600mm/min, defocusing amount 60mm, and the conveying speed of the argon gas is 5L/min, purity 99.99%.
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Cited By (2)
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| CN110405407A (en) * | 2019-08-13 | 2019-11-05 | 黄山学院 | A kind of novel restorative procedure of mold and device |
| CN112979348A (en) * | 2021-02-26 | 2021-06-18 | 深圳陶陶科技有限公司 | Structural color ceramic and preparation method and application thereof |
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| CN110405407A (en) * | 2019-08-13 | 2019-11-05 | 黄山学院 | A kind of novel restorative procedure of mold and device |
| CN112979348A (en) * | 2021-02-26 | 2021-06-18 | 深圳陶陶科技有限公司 | Structural color ceramic and preparation method and application thereof |
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