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CN104651678A - Aluminum alloy explosion suppression material and preparation method thereof - Google Patents

Aluminum alloy explosion suppression material and preparation method thereof Download PDF

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Publication number
CN104651678A
CN104651678A CN201510029441.9A CN201510029441A CN104651678A CN 104651678 A CN104651678 A CN 104651678A CN 201510029441 A CN201510029441 A CN 201510029441A CN 104651678 A CN104651678 A CN 104651678A
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China
Prior art keywords
aluminum alloy
explosion suppression
suppression material
blank
alloy
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CN201510029441.9A
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Chinese (zh)
Inventor
吴汉忠
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HUZHOU YANGXI ALUMINUM Co Ltd
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HUZHOU YANGXI ALUMINUM Co Ltd
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Priority to CN201510029441.9A priority Critical patent/CN104651678A/en
Publication of CN104651678A publication Critical patent/CN104651678A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses an aluminum alloy explosion suppression material, which comprises the following chemical components in percentage by weight: 0.5%-1% of copper, 5%-8% of silicon, 0.5%-1% of magnesium, 0.01%-0.1% of zinc, 0.1%-0.8% of manganese, 0.1%-0.5% of iron, 0.01%-0.07% of titanium, 0.01%-0.05% of nickel, 0.01%-0.05% of chromium and the balance of aluminum. Through reasonable metal proportion, excellent electrical conductivity and thermal conductivity, and corrosion resistance are achieved; and the aluminum alloy explosion suppression material is high in strength, and light in weight, and can be applied to the explosion suppression material instead of an existing material.

Description

A kind of aluminum alloy explosion suppression material and preparation method thereof
Technical field
The present invention relates to aluminum products, more specifically, relate to a kind of aluminum alloy explosion suppression material and preparation method thereof.
Background technology
Aluminium is element distributed more widely, and in the earth's crust, content is only second to oxygen and silicon, is that in metal, content is the highest.Fine aluminium density is lower, is 2.7 g/cm 3, have good heat conduction, electroconductibility (being only second to Au, Ag, Cu), ductility is good, plasticity is high, can carry out various mechanical workout.The chemical property of aluminium is active, and rapid oxidation forms one deck densification, firmly oxide film in atmosphere, thus has good solidity to corrosion.But the intensity of fine aluminium is low, only have the various aluminium alloys that just can obtain doing structure materials'use by alloying.
Aluminium alloy take aluminium as the alloy general name of base.Main alloy element has copper, silicon, magnesium, zinc, manganese, and secondary alloying element has nickel, iron, titanium, chromium, lithium etc.Aluminium alloy density is low, but strength ratio is higher, close to or exceed high-quality steel, plasticity is good, can be processed into various section bar.Especially aluminium alloy replaces steel casting to alleviate structural weight, so the good and requirement that is lightweight aluminium alloy of exploitation over-all properties increases day by day.
Along with social economy and scientific and technical development, the application of inflammable and explosive class I liquid I in each field is more and more, more and more wider.These inflammable and explosive class I liquid Is distinct, some has severe corrosive.Such as, the methyl alcohol developed in recent years, ethanol petrol are used widely in life, but methyl alcohol may produce reaction (CH in production and accumulating 3oH+O 2→ HCOOH+H 2o), be oxidized the organic acids such as the formic acid of generation and corrosion is caused to long period of soaking metal explosion-suppressing material surface in a liquid.And surface be corroded after explosion-suppressing material, its heat conduction, conductivity all will reduce greatly, can produce chip and aluminium rust, thus cause block oil line pipe.Therefore, the erosion resistance how strengthening explosion-suppressing material is very necessary.
Summary of the invention
The object of the invention is to, a kind of aluminium alloy is provided, there is excellent electroconductibility and thermal conductivity, and erosion resistance, and intensity is high, quality is light, indeformable aluminium alloy, and current material can be replaced to be used for block blast-proof materials.
First the present invention provides a kind of aluminum alloy explosion suppression material, it is characterized in that, the chemical composition of described aluminium alloy is, by weight percentage: copper 0.5%-1%, silicon 5%-8%, magnesium 0.5%-1%, zinc 0.01%-0.1%, manganese 0.1%-0.8%, iron 0.1%-0.5%, titanium 0.01%-0.07%, nickel 0.01%-0.05%, chromium 0.01%-0.05%, all the other are aluminium.
Be made up of the alloy foil net after joint-cutting also expansion, there is netted or cellular vesicular structure.
A kind of preparation method of above-mentioned aluminum alloy explosion suppression material is further provided, it is characterized in that,
S1. by each metal simple-substance mixing post-heating to 720 ~ 750 DEG C, make whole metal become liquid, and keep this temperature 1 ~ 1.5 hour, make each metal be dispersed in melting liquid phase;
S2. in described step (1), form blank with ingot casting after nitrogen and hexachloroethane refinery by de-gassing between liquid soak, 430 ~ 480 DEG C of insulations 24 hours, make its homogenizing;
S3. by described blank milling face;
S4., at 380 ~ 400 DEG C, blank is rolled into thickness is 6 ~ 6.5mm, width is the aluminum alloy blank of 40 ~ 900mm;
The aluminum alloy blank that described step S4 obtains is rolled into alloy foil by S5;
S6, by after the alloy foil joint-cutting shaping of described step S5 gained, draws in the net to expand to aluminum foil web; This aluminum foil web is folded shaping, obtains netted explosion-suppressing material.
In described S2, the purity of nitrogen is for being more than or equal to 99.999%, and is less than 100%.
The thickness of the alloy foil in described S5 is 0.03 ~ 0.08mm, width is 40 ~ 900mm.
Slot length in described S6 is 10 ~ 15mm, and adjacent joint-cutting spacing is 1 ~ 3mm and 2 ~ 6mm.
The netted explosion-suppressing material of described S6 cuts shaping, and winding makes cylindricality, rectangle or spherical explosion-suppressing material.
The invention has the advantages that:
1. in aluminium element, mainly with the addition of the element silicon of rational proportion, improve electroconductibility and the thermal conductivity of aluminium alloy, and with the addition of the alloying elements such as rational copper, silicon, magnesium, zinc, manganese, iron, titanium, nickel, chromium, improve the intensity of aluminium alloy and toughness and erosion resistance, aluminium alloy quality of the present invention is light, there is excellent over-all properties, current material can be replaced to be used for the aspects such as machinofacture, Transport Machinery, power machine and aircraft industry, alleviate structural weight and reach more than 50%.
2. because product of the present invention has feature that is anticorrosive, high strength, therefore, this product does not produce chip as during explosion-suppressing material, indeformable, is particularly useful for the safety precaution of the larger flammable and combustible liquids container containing of corrodibility and sledge-borne type refueling station storage tank.
3. aluminium alloy of the present invention is containing Al, Zn, Mg, Cu, Si, Mn, Ti element, these elements interact, make the present invention not only have common datonation-inhibition metallic substance conduction, good heat conductivity, the advantage that specific surface area is large, has feature that is anticorrosive, high strength simultaneously.
Embodiment
The present invention is further described below in conjunction with specific embodiment.Unless stated otherwise, the present invention adopts reagent, equipment and method are conventional commercial reagent, equipment and the conventional method used of the art.
Embodiment 1
A kind of aluminum alloy explosion suppression material, the composition that described aluminium alloy comprises and weight percent are: copper 0.5%, silicon 6%, magnesium 0.6%, zinc 0.01%, manganese 0.1%, iron 0.1%, titanium 0.01%, nickel 0.01%, chromium 0.01%, and all the other are aluminium 92.62% and inevitable impurity 0.04%.
Concrete steps are as follows:
(1) each metal simple-substance of above-mentioned weight ratio is placed in melting furnace, mixing post-heating to 750 DEG C, makes whole metal become liquid, and keep this temperature 1 hour, make each metal be dispersed in melting liquid phase;
(2) in step (1), be more than or equal to 99.999% by purity between liquid soak and be less than 100% nitrogen and hexachloroethane refinery by de-gassing after ingot casting formed blank, 480 DEG C insulation 24 hours, make its homogenizing.
(3) by blank milling face.
(4) by the blank behind milling face 430 DEG C of insulations after 1 hour, room temperature shrend, at 400 DEG C, to be rolled into blank with hot rolls that thickness is 6.5mm, width is the aluminum alloy blank of 900mm; And by this blank 120 DEG C of constant temperature 10 hours, 180 DEG C of constant temperature 10 hours.
After tested, the density of described aluminium alloy is 3.55kg/cm 3, fusing point is 600 DEG C, and perveance is 25m/ Ω * mm 2, at 25 DEG C, thermal conductivity is 170W/M.k, and tensile strength is 690MPa, and unit elongation is 11%.
(5) the aluminum alloy blank cold rolling mill that step (4) obtains is become thickness is 0.08mm, width is the alloy foil of 900mm.
(6) by the alloy foil of step (5) gained through the shaping of grooving machine joint-cutting, slot length is 15mm, and adjacent joint-cutting spacing is 3mm and 6mm; Then, launch with net puller, expand to aluminum foil web; This aluminum foil web is folded shaping, obtains netted block blast-proof materials.
Embodiment 2
A kind of aluminum alloy explosion suppression material, the composition that described aluminium alloy comprises and weight percent are: copper 0.55%, silicon 6.5%, magnesium 0.5%, zinc 0.01%, manganese 0.1%, iron 0.1%, titanium 0.01%, nickel 0.01%, chromium 0.01%, and all the other are aluminium 92.18% and inevitable impurity 0.03%.
Concrete steps are as follows:
(1) each metal simple-substance of above-mentioned weight ratio is placed in melting furnace, mixing post-heating to 750 DEG C, makes whole metal become liquid, and keep this temperature 1 hour, make each metal be dispersed in melting liquid phase;
(2) in step (1), be more than or equal to 99.999% by purity between liquid soak and be less than 100% nitrogen and hexachloroethane refinery by de-gassing after ingot casting formed blank, 480 DEG C insulation 24 hours, make its homogenizing.
(3) by blank milling face.
(4) by the blank behind milling face 430 DEG C of insulations after 1 hour, room temperature shrend, at 400 DEG C, to be rolled into blank with hot rolls that thickness is 6.5mm, width is the aluminum alloy blank of 900mm; And by this blank 120 DEG C of constant temperature 10 hours, 180 DEG C of constant temperature 10 hours.
After tested, the density of described aluminium alloy is 3.55kg/cm 3, fusing point is 600 DEG C, and perveance is 26m/ Ω * mm 2, at 25 DEG C, thermal conductivity is 180W/M.k, and tensile strength is 600MPa, and unit elongation is 9%.
(5) the aluminum alloy blank cold rolling mill that step (4) obtains is become thickness is 0.08mm, width is the alloy foil of 900mm.
(6) by the alloy foil of step (5) gained through the shaping of grooving machine joint-cutting, slot length is 15mm, and adjacent joint-cutting spacing is 3mm and 6mm; Then, launch with net puller, expand to aluminum foil web; This aluminum foil web is folded shaping, obtains netted block blast-proof materials.

Claims (7)

1. an aluminum alloy explosion suppression material, it is characterized in that, the chemical composition of described aluminium alloy is, by weight percentage: copper 0.5%-1%, silicon 5%-8%, magnesium 0.5%-1%, zinc 0.01%-0.1%, manganese 0.1%-0.8%, iron 0.1%-0.5%, titanium 0.01%-0.07%, nickel 0.01%-0.05%, chromium 0.01%-0.05%, all the other are aluminium.
2. aluminum alloy explosion suppression material according to claim 1, is characterized in that, is made up, has netted or cellular vesicular structure of the alloy foil net after joint-cutting also expansion.
3. a preparation method for aluminum alloy explosion suppression material according to claim 1, is characterized in that,
S1. by each metal simple-substance mixing post-heating to 720 ~ 750 DEG C, make whole metal become liquid, and keep this temperature 1 ~ 1.5 hour, make each metal be dispersed in melting liquid phase;
S2. in described step (1), form blank with ingot casting after nitrogen and hexachloroethane refinery by de-gassing between liquid soak, 430 ~ 480 DEG C of insulations 24 hours, make its homogenizing;
S3. by described blank milling face;
S4., at 380 ~ 400 DEG C, blank is rolled into thickness is 6 ~ 6.5mm, width is the aluminum alloy blank of 40 ~ 900mm;
S5. the aluminum alloy blank that described step S4 obtains is rolled into alloy foil;
S6. by after the alloy foil joint-cutting shaping of described step S5 gained, draw in the net to expand to aluminum foil web; This aluminum foil web is folded shaping, obtains netted explosion-suppressing material.
4. the preparation method of the aluminum alloy explosion suppression material according to claims 3, is characterized in that, in described S2, the purity of nitrogen is for being more than or equal to 99.999%, and is less than 100%.
5. the preparation method of the aluminum alloy explosion suppression material according to claims 3, is characterized in that, the thickness of the alloy foil in described S5 is 0.03 ~ 0.08mm, width is 40 ~ 900mm.
6. the preparation method of the aluminum alloy explosion suppression material according to claims 3, is characterized in that, the slot length in described S6 is 10 ~ 15mm, and adjacent joint-cutting spacing is 1 ~ 3mm and 2 ~ 6mm.
7. the preparation method of the aluminum alloy explosion suppression material according to claims 3, is characterized in that, the netted explosion-suppressing material of described S6 cuts shaping, and winding makes cylindricality, rectangle or spherical explosion-suppressing material.
CN201510029441.9A 2015-01-21 2015-01-21 Aluminum alloy explosion suppression material and preparation method thereof Pending CN104651678A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104894439A (en) * 2015-06-25 2015-09-09 潘应生 Chromium-aluminum alloy and preparation method thereof
CN105925850A (en) * 2015-12-31 2016-09-07 洛阳神佳窑业有限公司 Explosion-proof material
CN105925851A (en) * 2015-12-31 2016-09-07 洛阳神佳窑业有限公司 Explosion-proof material with reasonable proportion
CN105936993A (en) * 2015-12-31 2016-09-14 洛阳神佳窑业有限公司 Novel explosion-proof material
CN106271094A (en) * 2015-06-08 2017-01-04 中国兵器工业第五二研究所 A kind of method that cut alloy foil prepares explosion-suppressing material
WO2017000602A1 (en) * 2015-06-30 2017-01-05 比亚迪股份有限公司 Aluminum alloy and preparation method and use thereof
CN107299265A (en) * 2017-06-22 2017-10-27 合肥佳洋电子科技有限公司 A kind of security protection conductive material and preparation method thereof
CN107488797A (en) * 2017-09-08 2017-12-19 常州可赛成功塑胶材料有限公司 A kind of preparation method of aluminum titanium alloy explosion-suppressing material
CN111411269A (en) * 2020-05-22 2020-07-14 中泰民安防爆科技股份有限公司 Acid and alkali corrosion resistant alloy explosion-proof material
CN112342443A (en) * 2020-10-21 2021-02-09 山东隆泰石油装备有限公司 Barrier explosion-proof material and manufacturing process thereof
CN112775299A (en) * 2020-12-18 2021-05-11 江苏本安环保科技有限公司 Aluminum alloy barrier explosion-proof material and pressing die and pressing method thereof
CN112852254A (en) * 2020-12-30 2021-05-28 镇江市润发铝业有限公司 High-strength corrosion-resistant composite aluminum foil and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005002465A (en) * 2003-05-16 2005-01-06 Mitsubishi Alum Co Ltd Aluminum alloy sheet for high strength cap, and its production method
CN1904103A (en) * 2006-08-02 2007-01-31 王季庄 Production method of explosion inhibiting material
CN101144132A (en) * 2007-10-10 2008-03-19 江苏安普特防爆材料有限公司 Obstruct explosion-proof material and manufacturing technique thereof
CN101906561A (en) * 2010-02-02 2010-12-08 北京福吉长安防爆材料有限责任公司 Anti-explosion material and manufacturing method thereof
CN103540811A (en) * 2013-10-17 2014-01-29 常熟市良益金属材料有限公司 Aluminum alloy

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005002465A (en) * 2003-05-16 2005-01-06 Mitsubishi Alum Co Ltd Aluminum alloy sheet for high strength cap, and its production method
CN1904103A (en) * 2006-08-02 2007-01-31 王季庄 Production method of explosion inhibiting material
CN101144132A (en) * 2007-10-10 2008-03-19 江苏安普特防爆材料有限公司 Obstruct explosion-proof material and manufacturing technique thereof
CN101906561A (en) * 2010-02-02 2010-12-08 北京福吉长安防爆材料有限责任公司 Anti-explosion material and manufacturing method thereof
CN103540811A (en) * 2013-10-17 2014-01-29 常熟市良益金属材料有限公司 Aluminum alloy

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106271094A (en) * 2015-06-08 2017-01-04 中国兵器工业第五二研究所 A kind of method that cut alloy foil prepares explosion-suppressing material
CN104894439A (en) * 2015-06-25 2015-09-09 潘应生 Chromium-aluminum alloy and preparation method thereof
CN106319296A (en) * 2015-06-30 2017-01-11 比亚迪股份有限公司 Aluminum alloy and preparation method and application thereof
WO2017000602A1 (en) * 2015-06-30 2017-01-05 比亚迪股份有限公司 Aluminum alloy and preparation method and use thereof
CN105936993A (en) * 2015-12-31 2016-09-14 洛阳神佳窑业有限公司 Novel explosion-proof material
CN105925851A (en) * 2015-12-31 2016-09-07 洛阳神佳窑业有限公司 Explosion-proof material with reasonable proportion
CN105925850A (en) * 2015-12-31 2016-09-07 洛阳神佳窑业有限公司 Explosion-proof material
CN107299265A (en) * 2017-06-22 2017-10-27 合肥佳洋电子科技有限公司 A kind of security protection conductive material and preparation method thereof
CN107488797A (en) * 2017-09-08 2017-12-19 常州可赛成功塑胶材料有限公司 A kind of preparation method of aluminum titanium alloy explosion-suppressing material
CN111411269A (en) * 2020-05-22 2020-07-14 中泰民安防爆科技股份有限公司 Acid and alkali corrosion resistant alloy explosion-proof material
CN111411269B (en) * 2020-05-22 2021-03-16 中泰民安防爆科技股份有限公司 Acid and alkali corrosion resistant alloy explosion-proof material
CN112342443A (en) * 2020-10-21 2021-02-09 山东隆泰石油装备有限公司 Barrier explosion-proof material and manufacturing process thereof
CN112775299A (en) * 2020-12-18 2021-05-11 江苏本安环保科技有限公司 Aluminum alloy barrier explosion-proof material and pressing die and pressing method thereof
CN112852254A (en) * 2020-12-30 2021-05-28 镇江市润发铝业有限公司 High-strength corrosion-resistant composite aluminum foil and preparation method thereof

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Application publication date: 20150527