CN103343274B - High-thermal-conductivity graphite-aluminium strengthens aluminum graphite composite and preparation technology thereof - Google Patents
High-thermal-conductivity graphite-aluminium strengthens aluminum graphite composite and preparation technology thereof Download PDFInfo
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- CN103343274B CN103343274B CN201310313695.4A CN201310313695A CN103343274B CN 103343274 B CN103343274 B CN 103343274B CN 201310313695 A CN201310313695 A CN 201310313695A CN 103343274 B CN103343274 B CN 103343274B
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Abstract
The present invention relates to a kind of high-thermal-conductivity graphite-aluminium and strengthen aluminum graphite composite and preparation method thereof; this matrix material is made up of diamond, flake graphite and aluminum or aluminum alloy; described adamantine volume fraction is 21% ~ 41%; the volume fraction of flake graphite is 32 ~ 65%, and all the other are aluminum or aluminum alloy.(1) diamond particles and flake graphite are mixed obtain mixed powder; (2) in mixed powder, add polyvinyl alcohol solution (PVA) stir, suppressed preform method; (3) prefabricated section preheating and binder removal in a mold; (4) aluminum or aluminum alloy in crucible heat fused to 700-900 DEG C, then by aluminum or aluminum alloy melt cast in mould; (5) adopt hydropress to apply axle pressure, force aluminum or aluminum alloy melt infiltration to enter hole in prefabricated section; (6) cooling and demolding, takes out matrix material.Compared with prior art, gained matrix material of the present invention has high thermal conductivity, obtains higher mechanical property simultaneously.
Description
Technical field
The invention belongs to field of compound material, especially relate to a kind of high-thermal-conductivity graphite-aluminium and strengthen aluminum graphite composite and preparation technology thereof.
Background technology
Along with the continuous increase of electronics thermal power densities, the heat management of power device proposes new requirement to heat sink material.For high-power component, traditional heat sink material can not meet the demands.The development in recent years graphitized alumina based composites that gets up has high heat conduction, low bulk, low-density feature, in high-performance thermal management materials, illustrate huge advantage.
Flake graphite, owing to having high thermal conductivity and lower price, becomes the desirable feedstock preparing high-heat-conductive composite material.Powder metallurgic method and liquid phase Pressure Infiltration are the common methods of preparation graphitized alumina based composites.The people such as the Thomas Hutsch of Fraunhofer institute of Germany are at document " Innovative Metal-Graphite Composites as Thermally Conducting Materials.Proceedings of the Powder Metallury World Congress & Exibition.PM2010, Florence, Italy 10-14.October 2010, vol.5, pp.361-368 " in describe and adopt powder metallurgy SPS spark sintering to prepare graphite-metal matrix material, wherein the thermal conductivity of the graphite REINFORCED Al Si25Cu4.5Mg1 matrix material of 50% graphite volume fraction is 300W/mk, but it is low that the shortcoming of the method is prepared matrix material density.Low density not only makes high thermal conductivity not give full play to, and also reduces the mechanical property of material.The people such as the R.Prieto of especially big of Spain's Ali's bank describe the aluminum graphite composite that gas pressure infiltration has prepared silicon-carbide particle hybrid buildup in document " Thermal conductivity of graphite flakes-SiC particles/metal composites.Composite:Part A; vol.42; 2011, pp.1970-1977. ".The aluminum graphite composite prepared of the method when flake graphite volume fraction up to 90%, thermal conductivity only has 368W/mk, silicon carbide add the raising limiting heat conductivity.This is because in gas pressure infiltration process, carbonization Silicified breccias liquid Long contact time under the high temperature conditions, easily there is surface reaction in aluminium carbide and aluminium, at silicon-carbide particle Surface Creation aluminium carbide, thus reduce the thermal conductivity of silicon carbide/aluminum substrate, thus reduce the heat conductivility of composites.In order to meet the application requiring of aluminum graphite composite at field of radiating, how to give full play to the high thermal conductivity of matrix material, obtain higher mechanical property becomes problem demanding prompt solution simultaneously.
Summary of the invention
The object of the invention is to solve the not high problem do not given full play to Presence of an interface reaction reduction heat conductivility of existing aluminum graphite composite density, strengthen aluminum graphite composite and preparation technology thereof with the high-thermal-conductivity graphite-aluminium obtaining high comprehensive performance.
Object of the present invention can be achieved through the following technical solutions: a kind of high-thermal-conductivity graphite-aluminium strengthens aluminum graphite composite; it is characterized in that; this matrix material is made up of diamond, flake graphite and aluminum or aluminum alloy; described adamantine volume fraction is 21% ~ 41%; the volume fraction of flake graphite is 32 ~ 65%, and all the other are aluminum or aluminum alloy.
Described aluminium alloy comprises AlSi
7mg
0.3, AlSi
12.
High-thermal-conductivity graphite-aluminium strengthens a preparation method for aluminum graphite composite, and it is characterized in that, the method comprises the following steps:
(1) diamond particles and flake graphite are mixed obtain mixed powder;
(2) in mixed powder, add polyvinyl alcohol solution (PVA) stir, suppressed preform method;
(3) prefabricated section preheating and binder removal in a mold;
(4) aluminum or aluminum alloy in crucible heat fused to 700-900 DEG C, then by aluminum or aluminum alloy melt cast in mould;
(5) adopt hydropress to apply axle pressure, force aluminum or aluminum alloy melt infiltration to enter hole in prefabricated section;
(6) cooling and demolding, takes out matrix material.
Described in step (1), the diameter of diamond particles is 1 ~ 80 micron, and the diameter of flake graphite is 10 ~ 600 microns.
Described in step (2), the add-on of polyvinyl alcohol solution is the 3wt% of mixed powder, and churning time is 1 hour.
Described in step (3), preheating temperature is 500 DEG C, insulation 1h.
Described in step (5), axle pressure is 50 ~ 100MPa, keeps pressure 15 seconds.
Compared with prior art, the present invention improves heat conductivility and the mechanical property of matrix material by introducing diamond particles in aluminum graphite composite, adopts PVA to prepare prefabricated section, carries out extrusion casting subsequently and prepare matrix material.Wherein, adopt PVA to prepare prefabricated section and have certain bonding strength, solve the problem that delamination splitting occurs when suppressed preform method for diamond particles and flake graphite; Extrution casting technique (keeping pressure 15 seconds) is fast adopted to replace the gas pressure infiltration needing infiltration time a few hours, significantly shorten diamond and aluminium liquid duration of contact at high temperature, inhibit adamantine graphite transition, thus make matrix material obtain high thermal conductivity.Because diamond has very high intensity and hardness, the introducing of diamond particles substantially increases the mechanical property of material, thus solves the difficult problem of aluminum graphite composite due to the not enough work in-process easy fracture of physical strength.This Novel diamond confusion strengthens aluminum graphite composite and has high heat conduction and high mechanical property simultaneously concurrently, has greatly expanded the application prospect of aluminum graphite composite in field of heat management.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
The volume fraction 31% of diamond particles in diamond particles hybrid buildup aluminum graphite composite, the volume fraction 48% of flake graphite, all the other are rafifinal.Its preparation process is: diamond particles and flake graphite in mixer are carried out mechanical stirring by (1) in mass ratio at 1: 1, until mix, wherein the diameter of diamond particles is 10 microns, and the diameter of flake graphite is 500 microns; (2) in mixed powder, add the polyvinyl alcohol solution (PVA) of 3wt.%, then stir 1 hour, then mixed powder is put into mould inner pressure and make prefabricated section; (3) prefabricated section is heated to 500 DEG C in a mold and is incubated 1h, carries out binder removal; (4) aluminum or aluminum alloy heat fused to 800 DEG C in crucible, by aluminum or aluminum alloy melt cast in mould; (5) adopt hydropress to apply the axle pressure of 60MPa, force aluminum or aluminum alloy melt infiltration to enter hole in prefabricated section, keep pressure 15 seconds; (6) cooling and demolding, takes out matrix material.The performance test results: thermal conductivity 580W/ (mK), bending strength is 120MPa.
Embodiment 2
The volume fraction 21% of diamond particles in diamond particles hybrid buildup aluminum graphite composite, the volume fraction 65% of flake graphite, all the other are aluminium alloy AlSi
7mg
0.3.Its preparation process is: diamond particles and flake graphite in mixer are carried out mechanical stirring by (1) in mass ratio at 1: 2, until mix, wherein the diameter of diamond particles is 20 microns, and the diameter of flake graphite is 200 microns; (2) in mixed powder, add the polyvinyl alcohol solution (PVA) of 3wt.%, then stir 1 hour, then mixed powder is put into mould inner pressure and make prefabricated section; (3) prefabricated section is heated to 500 DEG C in a mold and is incubated 1h, carries out binder removal; (4) aluminum or aluminum alloy heat fused to 760 DEG C in crucible, by aluminum or aluminum alloy melt cast in mould; (5) adopt hydropress to apply the axle pressure of 80MPa, force aluminum or aluminum alloy melt infiltration to enter hole in prefabricated section, keep pressure 15 seconds; (6) cooling and demolding, takes out matrix material.The performance test results: thermal conductivity 462W/ (mK), bending strength is 84MPa.
Embodiment 3
The volume fraction 41% of diamond particles in diamond particles hybrid buildup aluminum graphite composite, the volume fraction 32% of flake graphite, all the other are aluminium alloy AlSi
12.Its preparation process is: diamond particles and flake graphite in mixer are carried out mechanical stirring by (1) in mass ratio at 2: 1, until mix, wherein the diameter of diamond particles is 50 microns, and the diameter of flake graphite is 400 microns; (2) in mixed powder, add the polyvinyl alcohol solution (PVA) of 3wt.%, then stir 1 hour, then mixed powder is put into mould inner pressure and make prefabricated section; (3) prefabricated section is heated to 500 DEG C in a mold and is incubated 1h, carries out binder removal; (4) aluminum or aluminum alloy heat fused to 780 DEG C in crucible, by aluminum or aluminum alloy melt cast in mould; (5) adopt hydropress to apply the axle pressure of 50MPa, force aluminum or aluminum alloy melt infiltration to enter hole in prefabricated section, keep pressure 15 seconds; (6) cooling and demolding, takes out matrix material.The performance test results: thermal conductivity 425W/ (mK), bending strength is 173MPa.
Embodiment 4
The diameter of the diamond particles adopted is 1 micron, and the diameter of flake graphite is 10 microns.
Axle pressure is 50MPa, keeps pressure 15 seconds.All the other are with embodiment 1.
Embodiment 5
The diameter of the diamond particles adopted is 80 microns, and the diameter of flake graphite is 600 microns.
Axle pressure is 100MPa, keeps pressure 15 seconds.All the other are with embodiment 1.
Claims (6)
1. high-thermal-conductivity graphite-aluminium strengthens a preparation method for aluminum graphite composite, and it is characterized in that, the method comprises the following steps:
(1) diamond particles and flake graphite are mixed obtain mixed powder;
(2) in mixed powder, add polyvinyl alcohol solution stir, suppressed preform method;
(3) prefabricated section preheating and binder removal in a mold;
(4) aluminum or aluminum alloy in crucible heat fused to 700-900 DEG C, then by aluminum or aluminum alloy melt cast in mould;
(5) adopt hydropress to apply axle pressure, force aluminum or aluminum alloy melt infiltration to enter hole in prefabricated section;
(6) cooling and demolding, takes out matrix material;
This matrix material is made up of diamond, flake graphite and aluminum or aluminum alloy, and described adamantine volume fraction is 21% ~ 41%, and the volume fraction of flake graphite is 32 ~ 65%, and all the other are aluminum or aluminum alloy.
2. a kind of high-thermal-conductivity graphite-aluminium according to claim 1 strengthens the preparation method of aluminum graphite composite, and it is characterized in that, described aluminium alloy comprises AlSi
7mg
0.3, AlSi
12.
3. high-thermal-conductivity graphite-aluminium according to claim 1 strengthens the preparation method of aluminum graphite composite, and it is characterized in that, described in step (1), the diameter of diamond particles is 1 ~ 80 micron, and the diameter of flake graphite is 10 ~ 600 microns.
4. high-thermal-conductivity graphite-aluminium according to claim 1 strengthens the preparation method of aluminum graphite composite, and it is characterized in that, described in step (2), the add-on of polyvinyl alcohol solution is the 3wt% of mixed powder, and churning time is 1 hour.
5. high-thermal-conductivity graphite-aluminium according to claim 1 strengthens the preparation method of aluminum graphite composite, and it is characterized in that, described in step (3), preheating temperature is 500 DEG C, insulation 1h.
6. high-thermal-conductivity graphite-aluminium according to claim 1 strengthens the preparation method of aluminum graphite composite, and it is characterized in that, described in step (5), axle pressure is 50 ~ 100MPa, keeps pressure 15 seconds.
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| CN111235420A (en) * | 2020-01-16 | 2020-06-05 | 西北工业大学 | Method for improving interlayer arrangement uniformity of flake graphite aluminum-based composite material by adding copper-plated aluminum sheet |
| CN114934221B (en) * | 2022-05-24 | 2023-04-07 | 江苏大学 | Graphite flake reinforced aluminum-based composite material and preparation method thereof |
| CN114855021B (en) * | 2022-05-26 | 2022-12-30 | 山东省科学院新材料研究所 | Preparation method of fullerene raw ash modified diamond/aluminum composite material |
| CN115572875B (en) * | 2022-10-14 | 2023-07-07 | 长飞光纤光缆股份有限公司 | Preparation method of diamond reinforced graphite aluminum high-heat-conductivity composite material |
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| CN1944698A (en) * | 2006-10-24 | 2007-04-11 | 北京科技大学 | Super high heat conduction, low heat expansion coefficient composite material and its preparing method |
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