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Preparation method of carborundum particle reinforced aluminum matrix composite material with high volume fraction

An aluminum-based silicon carbide, high volume fraction technology is applied in the field of forming metal matrix composite materials, which can solve the problems affecting the infiltration of aluminum liquid and the overall performance of composite materials, high equipment requirements, and high energy consumption, and achieves a small thermal expansion coefficient. The effect of eliminating SiO2 impurity phase and high thermal conductivity

Inactive Publication Date: 2011-09-21
HUNAN HANGTIAN CHENGYUAN PRECISION MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high volume fraction aluminum-based silicon carbide particle-reinforced composite materials, at present, most of the domestic and foreign countries use the method of preparing silicon carbide prefabricated parts and adding aluminized composite. During the sintering process, it is easy to produce bubbles, cracks, etc., and it is easy to generate impurity phases and harmful interfacial phases Al 4 C 3 , thus affecting the infiltration of molten aluminum and the overall performance of the composite

Method used

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  • Preparation method of carborundum particle reinforced aluminum matrix composite material with high volume fraction
  • Preparation method of carborundum particle reinforced aluminum matrix composite material with high volume fraction
  • Preparation method of carborundum particle reinforced aluminum matrix composite material with high volume fraction

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: low temperature multistage sintering method

[0025] Put the pressed silicon carbide in the sintering equipment, raise the temperature from room temperature to 220-250°C at a rate of 2.5-3°C / min, and keep it warm for 1-1.5h; then raise the temperature at a rate of 3-5°C / min to 300-320°C, keep warm for 1-1.2h; then raise the temperature to 450-480°C at a heating rate of 3-5°C / min, keep warm for 1-1.2h; finally raise the temperature to 830-850 at a heating rate of 5°C / min ℃, heat preservation for 1.2-1.5h to obtain the silicon carbide preform.

Embodiment 2

[0026] Example 2: Preparation of SiCp / AI composite material with a silicon carbide volume fraction of 75%

[0027] (1) The volume percentage of silicon carbide powder is 75%, and the volume percentage of aluminum alloy is 25%;

[0028] (2) According to the gradation theory, select 70 parts of silicon carbide powder of W63, 20 parts of silicon carbide powder of W28, and 10 parts of silicon carbide powder of W7, pour into the mixer and mix for 3 hours;

[0029] (3) Accurately weigh the high-temperature binder and the low-temperature binder according to the proportioning ratio, wherein the mass fraction of the low-temperature binder paraffin is 3 parts, and the mass fraction of the high-temperature binder silicone resin is 2.5 parts, which are dissolved in a solvent respectively , then add the mixed silicon carbide powder and mix evenly;

[0030] (4) The mixture is dried, granulated and sieved, and pressed into shape with a pressing pressure of 180MPa;

[0031] (5) Put the comp...

Embodiment 3

[0035] Example 3: Preparation of SiCp / Al composite material with a volume fraction of silicon carbide of 50%

[0036] (1) The volume percentage of silicon carbide powder is 50%, and the volume percentage of aluminum alloy is 50%;

[0037] (2) According to the gradation theory, select 90 parts of W63 silicon carbide powder and 10 parts of W10 silicon carbide powder, pour them into the mixer and mix for 2 hours.

[0038] (3) Accurately weigh the high-temperature binder and the low-temperature binder according to the proportioning ratio, wherein the mass fraction of the low-temperature binder paraffin is 4 parts, and the mass fraction of the high-temperature binder silicone resin is 4 parts, which are respectively dissolved with a solvent , then add the mixed silicon carbide powder and mix evenly;

[0039] (4) The mixture is dried, granulated and sieved, and pressed into shape by regulating and controlling the molding pressure, wherein the pressing pressure is 120MPa;

[0040] ...

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Abstract

The invention discloses a preparation method of a carborundum particle reinforced aluminum matrix composite material with high volume fraction. The method adopts a low temperature multi-stage sintering technology, wherein a sintering temperature needed by the low temperature multi-stage sintering technology is obviously lower than a sintering temperature (over 1000 DEG C) needed by the prior arts at home and abroad. In the invention, carborundum powder and aluminium alloy are utilized as raw materials to prepare the carborundum particle reinforced aluminum matrix composite material, wherein volume fraction of the carborundum powder can be adjusted in a range of 50 to 75%. Through utilizing the method provided by the invention, the problems which are in the prior arts and comprise a high sintering temperature, easy generation of impurity phases and a harmful interface phase Al4C3, high equipment requirements, high energy consumption, poor overall performances of composite material products, etc. are solved. The method provided by the invention has the advantages of simple processes and low cost.

Description

technical field [0001] The invention belongs to the molding technology of metal-based composite materials, and in particular provides a method for preparing high-volume-fraction aluminum-based silicon carbide particle-reinforced composite materials. Background technique [0002] As a new generation of electronic packaging and structural materials, aluminum-silicon carbide composite materials have been developed due to different uses. Fractions are 50% ≤ silicon carbide volume fraction ≤ 75%, and the preparation methods are also different. At present, the preparation technology of low volume fraction and medium volume fraction composite materials is relatively mature, and the performance of the products is relatively ideal. For high volume fraction aluminum-based silicon carbide particle-reinforced composite materials, at present, most of the domestic and foreign countries use the method of preparing silicon carbide prefabricated parts and adding aluminized composite. During...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C21/00
Inventor 刘韵妍万绍平舒阳会胡盛青海春英吴凯峰谭春林
Owner HUNAN HANGTIAN CHENGYUAN PRECISION MACHINERY
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