Preparation method for silicon carbide fiber bundle enhanced aluminum matrix composite

Abstract

The invention discloses a preparation method for a silicon carbide fiber bundle enhanced aluminum matrix composite. Quartz fiber bundles are adopted to be woven into fiber cloths, the fiber cloths and graphite powder are pressed in a layered mode to form silicon carbide fiber cloths, aluminum or an aluminum alloy foil and the silicon carbide fiber cloths are subjected to layered alternate overlapping, a prefab before composite pressing and sintering is obtained, the prefab is subjected to pressing, sintering and cooling, and a filament silicon carbide fiber bundle net-shaped enhanced aluminum matrix composite is obtained. The volume fraction of silicon carbide fiber in the prepared silicon carbide fiber bundle net-shaped enhanced aluminum matrix composite is 50-60%. The compactness of the composite is 95.5-98.7%, the density is 2.80-2.90 g / cm<3>, the anti-bending elasticity modulus is 109-136 Gpa, the heat conductivity of the composite is high and not less than 170 W / (m.K), and the coefficient of thermal expansion is (8.5-12.5)x10<-6> / K and adjustable. Compared with a current used aluminum silicon carbide composite, the heat conductivity is high, the volume fraction of an enhancesome SiC is large, and the cost of the silicon carbide fiber bundle enhanced aluminum matrix composite is lower than the cost of an aluminum diamond composite.

Description

technical field [0001] The invention belongs to the technical field of inorganic composite materials, and in particular relates to a preparation method of a silicon carbide fiber bundle reinforced aluminum matrix composite material. Background technique [0002] The larger the volume fraction of reinforcement SiC in silicon carbide reinforced aluminum matrix composites, the higher the thermal conductivity, the smaller the thermal expansion coefficient, and at the same time have high specific strength and specific stiffness, low density, wear resistance, fatigue resistance and dimensional stability. better. The addition of a large amount of granular or short fiber-like reinforcements will lead to a decrease in the toughness of the composite material. If the composite material can be prepared by using filament-like silicon carbide mesh as a reinforcement, it will certainly ensure the strength. Reduce toughness. In addition, the brittleness of silicon carbide is high, and the...

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Problems solved by technology

[0003] At present, the preparation of silicon carbide fiber-reinforced aluminum matrix composites is often achieved by adding particles or short fibers from the outside. The distribution in the infiltration is uneven, and the bonding force needs to be improved; the infiltration effect of the infiltration method is poor, and the thickness of the infiltration layer is small, which generally belongs to the category of surface treatment; (2) stirring casting method: due to the wettability of SiC and aluminum matrix Poor, resulting in particles that are difficult to incorporate into the melt

Patent (201110427149.4) A silicon carbide reinforced aluminum matrix composite material and its preparation method, using silicon carbide and aluminum powder in the mold for multiple sintering heat preservation, the procedure is cumbersome, and improper control of the process parameters of sintering heat preservation is likely to be unacceptable to the required materials

[0004] At the same time, a good combination between the reinforcement and the matrix is ​​crucial to the performance of the composite material, but the wettability of silicon carbide and the aluminum matrix is ​​poor, so the bonding force between the reinforcement and the matrix in the composite material is weak, so How to obtain composite materials with better binding force is very important

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