Mullite fiber reinforced quartz ceramic composite material and preparation method thereof

Abstract

The invention relates to a mullite fiber reinforced quartz ceramic composite material, which is characterized by comprising mullite fibers with lengths of L1, L2 and L3, silicon oxide is attached to the mullite fibers; fused quartz is distributed around the mullite fibers; the length ranges of L1, L2 and L3 are as follows: L1 is more than or equal to 3 and less than 5 mm, L2 is more than or equal to 5 and less than 7 mm, and L3 is more than or equal to 7 and less than 10 mm; the weight ratio of the fibers with the lengths of L1, L2 and L3 in the mullite fibers is (0.7-1.3): 3: (0.7-1.3); and the ratio of the total weight of the mullite fibers to the weight of the fused quartz is (10-15): (40-45). The invention also provides a preparation method of the material. The performance indexes of the mullite fiber reinforced quartz ceramic composite material can meet the performance requirements of high Mach number aircraft manufacturing materials.

Description

technical field [0001] The invention relates to the technical field of mullite fiber-reinforced quartz ceramic composite materials, in particular to a mullite fiber-reinforced quartz ceramic composite material meeting the requirements of high Mach number aircraft, and a preparation method thereof. Background technique [0002] Due to its outstanding properties, such as low thermal expansion coefficient, low specific heat capacity, high softening temperature, high chemical stability, low dielectric loss and high dielectric strength, quartz ceramics have become a very important material in various engineering applications. Due to its outstanding dielectric and thermal properties, fused silica has great application prospects in aerospace engineering projects. Due to its inherent brittleness and low tensile fracture toughness, and its sensitivity to stress concentration and microcracks, pure fused silica is practical application is very limited. Therefore, fiber material is usu...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the inherent brittleness of fused silica materials, low tensile fracture toughness and sensitivity to stress concentration and microcracks; Stone fiber reinforced quartz ceramic composite material; solves the problem of the long period of continuous fiber weaving prefabrication, the difficulty of processing and preparing components with complex structures, and the short ceramic fibers that easily lead to low strength and toughness of the final material, and in the process of material preparation, short ceramic fibers Dispersion is uneven, linear or group-like aggregation is easy to occur, and the final sintering conditions are reduced, avoiding sintering under high pressure conditions, which is conducive to the market promotion of final materials, and provides a mullite fiber reinforced quartz ceramic composite material. Preparation