Carbon material 3D toughened silicon carbide composite material and its preparation method and application

Abstract

The invention relates to the field of inorganic materials and discloses a carbon material 3D toughened silicon carbide composite as well as a preparation method and an application thereof. The carbonmaterial 3D toughened silicon carbide composite comprises 0.01wt%-10wt% of a micrometer-sized carbon material, 0.01wt%-10wt% of a nanometer-sized carbon material and 80wt%-99wt% of silicon carbide, and a micrometer-nanometer-sized carbon material 3D toughening structure is formed by intervention of the micrometer-sized carbon material and the nanometer-sized carbon material into silicon carbide. Compared with the prior art, only a small quantity of the carbon material needs to be used for obviously improving the toughening effect of silicon carbide, interfacial bond property of the carbon material with silicon carbide is good, the formed silicon carbide composite is stable in performance, and silicon carbide composite ceramic prepared from the silicon carbide composite is high in bending strength.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a carbon material 3D toughened silicon carbide composite material and its preparation method and application. Background technique [0002] Silicon carbide ceramics have excellent characteristics such as high temperature strength, strong oxidation resistance, good wear resistance, good thermal stability, low thermal expansion rate, high thermal conductivity and strong chemical corrosion resistance, especially at 1400 °C, the strength is still The characteristics that remain basically unchanged make it widely used in the fields of automobiles, mechanical chemicals, environmental protection, space technology, etc., and it has become an irreplaceable structural material in many fields. [0003] However, silicon carbide has the problem of brittle cracking, which affects its further application, so the "toughening" of silicon carbide has become an urgent problem to be solved in the ...

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Problems solved by technology

Geng Haoran applied for "A device and process for preparing carbon fiber reinforced silicon carbide composite material" (CN 03138926.0) and "A multi-component silicon carbide ceramic with carbon fiber embedded in it", Zhang Yunlong's doctoral thesis "Short carbon fiber toughening carbonization Preparation of Silicon-based Composite Materials and Research on Its Fracture Mechanism", Qiao Guanjun's "Preparation Method of High-Strength and High-Density Isotropic Carbon Sliding Plate" (CN 101747039 A), Xiao Peng's "Carbon Fiber Reinforced Carbon-Silicon Carbide Dual-Matrix Friction Material "Preparation method" (CN 101486588 B) etc. all use carbon materials, especially carbon fiber toughened silicon carbide, but such methods have problems such as large amount of carbon materials, cumbersome preparation process, poor interface bonding, etc., and there are certain defects.

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