Silicon nitride foam ceramic reinforced aluminum matrix composite material and its preparation method and application

Abstract

The invention discloses a Si 3 N 4 Ceramic foam reinforced aluminum matrix composite material and its preparation method and application, the composite material includes aluminum matrix and Si 3 N 4 Ceramic foam, Si 3 N 4 Foamed ceramics include Si 3 N 4 Foam ceramic framework and in situ growth on Si 3 N 4 Columnar β‑Si on the framework pore walls of ceramic foams 3 N 4 Grain, aluminum matrix uniformly filled in Si 3 N 4 In the pores of the ceramic foam framework, columnar β‑Si 3 N 4 The grains are surrounded by an aluminum matrix. The preparation method of the composite material comprises the following steps: using a vacuum pressure infiltration process to press liquid metal aluminum into Si 3 N 4 In the pores of the ceramic foam skeleton, Si 3 N 4 Ceramic foam reinforced aluminum matrix composites. The Si 3 N 4 The ceramic foam reinforced aluminum matrix composite material has the advantages of good toughness, erosion resistance and good machining performance, and the preparation method is simple and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a Si 3 N 4 Foam ceramic reinforced aluminum matrix composite material and its preparation method and application. Background technique [0002] Erosion wear is a form of dynamic wear, which is caused by the movement of fluid rich in hard particles relative to the solid surface, so that the solid surface is continuously subjected to the collision and impact of hard particles. This form of wear exists in various slurry conveying pipelines, such as concrete conveying pipelines in the construction industry, coal conveying pipelines in the coal mining industry, and sand pumping pipelines working underwater. In addition, the external components of aircraft and high-speed trains working in windy and sandy environments also show similar wear mechanisms due to the impact of tiny sand particles. In order to improve the erosion and wear resistance of pipelines, the common tec...

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Problems solved by technology

However, related studies have shown that under the continuous erosion and wear of the slurry, the reinforcement particles or fibers in the composite matrix will be continuously exposed due to the wear of the surrounding matrix, and will be separated from the matrix under the impact of the particles in the slurry. Debonding, eventually causing severe wear of the composite

Although the method of adding ceramic bushings inside the pipeline can greatly improve the erosion and wear resistance of the pipeline, due to the high brittleness of the ceramic material, it is prone to cracking or even catastrophic damage when it is impacted by the particles in the slurry , thus affecting its normal use

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