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Method for preparing graphite whisker reinforced aluminum matrix composite material

A technology of graphite whisker and composite material, which is applied in the field of high thermal conductivity graphite whisker reinforced aluminum matrix composite material and its preparation, achieves the effects of low thermal expansion coefficient, low production cost and simple production equipment

Inactive Publication Date: 2012-07-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the interface bonding problem of graphite whisker / aluminum composite material

Method used

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  • Method for preparing graphite whisker reinforced aluminum matrix composite material
  • Method for preparing graphite whisker reinforced aluminum matrix composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, put graphite whiskers into 20% NaOH solution and boil for 15 minutes to remove surface oil. Then put the treated graphite whiskers into 20% HNO 3 Boil in the solution for 15 min to roughen the surface. Sensitize and activate graphite whiskers that have been roughened after degreasing. The formula of sensitization solution is 20ml / LHCl+20g / LSnCl 2 , the activation solution formula is 20ml / L HCI+0.5g / LPdCl 2 . During the activation and sensitization stage, the solution should be vigorously stirred for 15 minutes.

[0018] Pour the sensitized and activated graphite whiskers into the copper plating solution. The formula of the solution is copper sulfate pentahydrate 15g / L, potassium sodium tartrate 14g / L, EDTA 19.5g / L, bipyridine 0.02g / L, Potassium ferrocyanide 0.01g / L. And add 10ml / L of formaldehyde solution with a mass fraction of 36%, the plating pH is 12, the temperature is 45°C, and the plating time is 3min. After the plating solution is filtered out by v...

Embodiment 2

[0022] A titanium layer with a thickness of 0.2 μm was plated on the surface of graphite whiskers by vacuum micro-evaporation plating. Graphite whiskers after degreasing to a certain extent are mixed with titanium trichloride and titanium cyanide powder according to the mass ratio of graphite whiskers: titanium trichloride: titanium cyanide=100:1:8, placed in a coating container, and Put them into a vacuum chamber together, and the vacuum chamber is pumped to a vacuum degree of 10 -3 Pa, start heating to 700°C, at this time the pressure of the vacuum chamber rises to (1-10Pa), plating for 2 hours, a titanium layer is formed on the surface of the graphite whisker. Then evacuate to high vacuum (10 -3 Pa), get rid of residual reaction gas phase, sieve after cooling and taking out, obtain the graphite whisker with uniform coating.

[0023] The preparation of porous prefabricated body: get a certain amount of titanium-plated graphite whiskers and paraffin wax binder and pour in t...

Embodiment 3

[0026] A titanium layer with a thickness of 0.2 μm was plated on the surface of graphite whiskers by vacuum micro-evaporation plating. Graphite whiskers after degreasing to a certain extent are mixed with titanium trichloride and titanium cyanide powder according to the mass ratio of graphite whiskers: titanium trichloride: titanium cyanide=100:1:8, placed in a coating container, and Put them into a vacuum chamber together, and the vacuum chamber is pumped to a vacuum degree of 10 -3 Pa, start heating to 700°C, at this time the pressure of the vacuum chamber rises to (1-10Pa), plating for 2 hours, a titanium layer is formed on the surface of the graphite whisker. Then evacuate to high vacuum (10 -3 Pa), get rid of residual reaction gas phase, sieve after cooling and taking out, obtain the graphite whisker with uniform coating.

[0027] The preparation of porous prefabricated body: get a certain amount of titanium-plated graphite whiskers and paraffin wax binder and pour in t...

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Abstract

The invention discloses a method for preparing a graphite whisker reinforced aluminum matrix composite material. The composite material consists of plated high-reinforced-phase heat conducting graphite whiskers and matrix aluminum or aluminum alloy, wherein the volume fraction of the matrix aluminum or the aluminum alloy is 40%-65%, and the volume fraction of the plated graphite whiskers is 35%-60%. The production process comprises the steps of 1 adopting a chemical plating or vacuum salt bath plating method to plate copper or titanium on the surfaces of the graphite whiskers so as to form a plating layer with thickness of 0.1-1.5mum; 2 adding an appropriate amount of binder on the graphite whiskers with modified surfaces to perform die forming, and then adopting thermal degreasing to remove the binder and manufacture a porous prefabricated blank; and 3 stacking up the prefabricated blank and the aluminum or the aluminum alloy to perform vacuum pressure infiltration processing so as to finally obtain a graphite whisker-aluminum composite material part. The composite material prepared by means of the method has the advantages of being high in heat conductivity, low in thermal expansion coefficient, light in weight, high in densification, easy to process and the like.

Description

technical field [0001] The invention relates to a graphite whisker-reinforced aluminum-based composite material with high thermal conductivity and a preparation method thereof, belonging to the technical field of metal-based composite materials. Background technique [0002] With the rapid development of electronic technology, the performance requirements of electronic packaging materials in modern electronic circuit design are increasing, which requires electronic packaging materials to have high thermal conductivity (TC), low coefficient of expansion (CTE), light weight, and good processing performance and lower prices. The thermal conductivity of W-Cu and Mo-Cu alloys in traditional metal electronic packaging materials is low, and the thermal conductivity of SiC-Al can reach 200 W / (m K), but the subsequent processing performance is not good, which limits its application. widely used. [0003] High thermal conductivity graphite whisker is a new type of high-performance t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/04C22C47/06C22C47/08C22C49/06C22C49/14C22C101/10C22C121/02
Inventor 何新波刘骞刘婷婷张昊明任淑彬吴茂曲选辉
Owner UNIV OF SCI & TECH BEIJING
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