High-performance silicon carbide ceramic material and preparation method thereof

Abstract

The invention relates to a high-performance silicon carbide ceramic material and a preparation method thereof. The preparation method comprises the following steps of raw material preparation, ball-milling mixing, spray granulation, compression molding and sintering. Through the adding proportion of alpha-silicon carbide powder and beta-silicon carbide powder in the raw materials, grain boundary strengthening and grain refinement are facilitated, and further, the obdurability and the hardness of the silicon carbide ceramic are improved. The sintering temperature range can be expanded by proper sintering aid composition, and convenience is brought to process control; the sintering aid is B4C, C and AlN, and when the mass ratio of B4C to C to AlN is (1-2): (1.5-3): (1-3), the sintering aid can better improve the interface bonding strength between silicon carbide grains and promote the improvement of high-temperature strength. When the sintering temperature is 2050 DEG C, the sintering density of the silicon carbide ceramic material is high. The prepared silicon carbide ceramic material has excellent room-temperature and high-temperature mechanical properties.

Description

technical field [0001] The invention relates to a silicon carbide ceramic material, in particular to a high-performance silicon carbide ceramic material and a preparation method thereof. Background technique [0002] With the development of science and technology, people have higher requirements for the research of new materials. In terms of engineering materials, not only are materials required to have good mechanical properties, but also excellent physical and chemical properties, such as density, corrosion resistance, high temperature resistance, heat transfer, etc. Structural ceramic materials can meet many performance requirements. [0003] Silicon carbide ceramics is an important member of structural ceramics. It has excellent high-temperature strength, high hardness, high temperature resistance, and corrosion resistance. It can be used in many aspects such as bearings, rotors, vehicles, and shipbuilding. The preparation methods of silicon carbide ceramics mainly inc...

AI Technical Summary

Problems solved by technology

However, silicon carbide ceramics prepared by pressureless sintering still have problems such as low toughness, low density, and further improvement in strength and hardness.

At present, in order to prepare dense silicon carbide ceramics with excellent performance, patent document 1 (CN104446493A) adopts two-step pressureless solid-phase sintering to prepare silicon carbide ceramics, but the preparation process is complicated and the strength and toughness are not high.

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