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A kind of preparation method of aluminum carbon composite material

A technology of aluminum-carbon composite material and aluminum alloy powder, which is applied in the field of preparation of aluminum-carbon composite material, can solve problems such as not being well realized, and achieve the effects of short residence time at high temperature, avoiding harmful interface reactions, and improving preparation efficiency.

Active Publication Date: 2017-08-15
SUZHOU ALOME SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process is used to prepare aluminum-carbon composite materials. Although the performance of the prepared composite material is relatively excellent, it is not well realized. It can not only solve the interface performance, but also realize the continuity of the process.

Method used

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  • A kind of preparation method of aluminum carbon composite material
  • A kind of preparation method of aluminum carbon composite material
  • A kind of preparation method of aluminum carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing an aluminum-carbon composite material, specifically comprising the following steps:

[0030] 1) Mix 40g of pure aluminum powder with a particle size of 30 microns and 0.2g of stearic acid as a process control agent, and use a planetary ball mill for pre-milling. The ball-to-material ratio used for pre-milling is 10 / 1, and the speed is 200 rpm / minute, ball milling time 1 hour, made flake pure aluminum powder;

[0031] 2) The flaky pure aluminum powder obtained in step 1), 0.33g of process control agent stearic acid and 26.7g of natural flake graphite (provided by Qingdao Jinrilai Graphite Co., Ltd.) with a diameter of 300 microns and a thickness of 5 microns were three Those who mix, adopt planetary ball mill to carry out ball milling, the ball material ratio that adopts during ball milling is 10 / 1, rotating speed 300 revs / min, ball milling time 2 hours, make composite powder;

[0032] 3) Encapsulate the prepared composite powder in a metal slee...

Embodiment 2

[0034] Example 2 The difference between this example and Example 1 is that the mass of the graphite sheet in step 2 is 0.40g (1% by mass), and the process control agent stearic acid is 0.2g, so that the thermal conductivity of the composite material is 150W / mK, the coefficient of thermal expansion is 18×10 -6 m / K.

Embodiment 3

[0035] Example 3 The difference between this example and Example 1 is that the mass of the graphite sheet in step 2) is 40g, the process control agent stearic acid is 0.4g, and the thermal conductivity of the composite material obtained is 270W / mK, and the thermal expansion coefficient is 7 ×10 -6 m / K.

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Abstract

The invention discloses an aluminum-carbon composite material and a preparation method thereof. The preparation method comprises the following steps of 1, mixing pure aluminum powder or aluminum alloy powder and a process control agent and carrying out pre-ball-milling to obtain flake-like pure aluminum powder or aluminum alloy powder, 2, mixing the flake-like pure aluminum powder or aluminum alloy powder obtained by the step 1 and graphite flakes, adding a process control agent into the mixture and carrying out ball milling to obtain composite powder, 3, packaging the composite powder in a metal sleeve, preheating the composite powder to a temperature of 400-620 DEG C and carrying out rolling to obtain an aluminum-carbon composite material blank, and 4, removing the metal sleeve and burr to obtain a desired product, wherein a mass ratio of the pure aluminum powder or aluminum alloy powder to the graphite flakes is 0.25-99. The preparation method realizes continuity, improves directional distribution of carbon in an aluminum-based composite material and greatly improves production efficiency. The prepared aluminum-carbon composite material has high heat conductivity, a low thermal expansion coefficient, machinability and a wide application prospect.

Description

technical field [0001] The invention relates to a preparation process of a composite material, in particular to a preparation method of an aluminum-carbon composite material. Background technique [0002] Aluminum-carbon composite material has the advantages of light weight, high thermal conductivity, and low thermal expansion coefficient. It is an excellent packaging material that can be used in high-tech fields such as computers, avionics, and military communications. For composite materials, the better the performance of the reinforcement, the better the performance of the composite material. Among them, graphite flakes have a layered structure, and the thermal diffusivity in the layer direction is very low, and the thermal conductivity of pyrolytic graphite flakes is even negative. What is more excellent is that the thermal conductivity of graphite flakes in the layer direction is very high, and ordinary graphite flakes can also Reach 1600-2000W / mK. Studies have shown ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C21/00
Inventor 陈明海童伟姚争争李清文徐文雷
Owner SUZHOU ALOME SCI & TECH
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