Preparation method of graphite-ball-enhanced aluminium-based composite material with high heat-conductivity isotropy

An aluminum-based composite material and a composite material technology are applied in the field of graphite ball-aluminum-based composite materials and their preparation, which can solve the problems of high anisotropy of thermal conductivity, achieve low thermal expansion performance, simple and reliable preparation method, and thermal conductivity. Good rate isotropy

Inactive Publication Date: 2018-11-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the thermal conductivity of traditional NGAMC or PGAMC composite material has high anisotropy, provide a kind of high thermal conductivit...

Method used

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  • Preparation method of graphite-ball-enhanced aluminium-based composite material with high heat-conductivity isotropy
  • Preparation method of graphite-ball-enhanced aluminium-based composite material with high heat-conductivity isotropy

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Preparation of graphite ball-aluminum matrix composite material at 450 °C

[0019] The graphite balls with an average particle size of 50 μm and the aluminum powder with an average particle size of 48 μm were mechanically mixed according to the set volume ratio, and mixed on a mixer for 6 hours.

[0020] The mechanically mixed powder is loaded into a Φ10mm graphite mold for spark plasma sintering, the sintering pressure is 30MPa, the temperature is raised to 200°C for 5-10 minutes, and the graphite ball-aluminum matrix composite material is obtained by cooling to room temperature with water cooling in the furnace.

Embodiment 2

[0021] Example 2: Preparation of graphite ball-aluminum matrix composite material at 500 °C

[0022] Graphite balls with an average particle size of 50 μm and pure aluminum powders with an average particle size of 48 μm were mechanically mixed according to the set volume ratio, and mixed on a mixer for 6 hours.

[0023] The mechanically mixed powder is loaded into a Φ10mm graphite mold for spark plasma sintering, the sintering pressure is 30MPa, the temperature is raised to 350°C for 5-10 minutes, and the graphite ball-aluminum matrix composite material is obtained by cooling to room temperature with water cooling in the furnace.

Embodiment 3

[0024] Example 3: Preparation of graphite ball-aluminum matrix composite material at 550 °C

[0025] Graphite balls with an average particle size of 50 μm and pure aluminum powders with an average particle size of 48 μm were mechanically mixed according to the set volume ratio, and mixed on a mixer for 6 hours.

[0026] The mechanically mixed powder is loaded into a Φ10mm graphite mold for spark plasma sintering, the sintering pressure is 30MPa, the temperature is raised to 400°C for 5-10 minutes, and the graphite ball-aluminum matrix composite material is obtained by cooling to room temperature with water cooling in the furnace.

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Abstract

The invention discloses a preparation method of a graphite-ball-enhanced aluminium-based composite material with high heat-conductivity isotropy, and belongs to the field of metal materials. The aluminium-based composite material contains the following components according to volume fraction: 40%-80% of pure-aluminium powder and 20%-60% of graphite ball. The production process comprises the following steps: firstly mixing the pure-aluminium powder and the graphite ball powder according to corresponding volume-fraction proportion, then placing the mixed powder into a graphite mold together to carry out spark plasma sintering, and thus obtaining the graphite-ball-aluminium-based composite material with high volume fraction, high heat conductivity, high density and approximate isotropy. The preparation method disclosed by the invention has the beneficial effects that the prepared graphite-ball-aluminium-based composite material with high heat conductivity and approximate isotropy is highin density and uniform in tissue distribution, and can realize large-batch production, low production cost and high practical level. The heat conductivity of the aluminium-based composite material isapproximately isotropic, and can reach 227.61W.m<-1>.k<-1> in the X and Y directions and 187.27W.<-1>.k<-1> in the Z direction. The heat expansion coefficient fluctuates between 6.4-10.6*10-6K<-1> under the room-temperature condition and the density can reach more than 98%.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a graphite ball-aluminum matrix composite material (SphericalGraphite-Aluminum Matrix Composites, SGAMC) and a preparation method thereof. Background technique [0002] It can exhibit efficient thermal conductivity in the direction of the graphite basal plane, and the theoretical thermal conductivity is as high as 2000W m -1 ·K -1 . In the direction perpendicular to the graphite sheets, the van der Waals forces between the graphite sheets are combined together, and the theoretical spacing between the sheets is much larger than the spacing between adjacent carbon atoms in the graphite sheet Therefore, the scattering effect of phonon propagation in the direction perpendicular to the graphite sheet is large, and the thermal conductivity is low, and the theoretical value is only 6W m -1 ·K -1 . [0003] Natural graphite is highly anisotropic, and its thermal conductivity in the...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C21/00B22F3/105
CPCB22F3/105B22F2003/1051C22C1/05C22C21/00C22C32/0084
Inventor 何新波王旭磊潘彦鹏吴茂曲选辉
Owner UNIV OF SCI & TECH BEIJING
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