Silicon oxynitride combined carborundum high-temperature ceramic material and preparation method thereof

Abstract

The invention discloses a silicon oxynitride combined carborundum high-temperature ceramic material which is made of raw materials of aggregate, power lot, admixture and binding agent, wherein the mass sum of the aggregate and the power lot is based on 100 percent, the content of the aggregate is 65-75 percent and the content of the power lot is 25-35 percent; the aggregate is carborundum aggregate; the power lot comprises carborundum powder, silica powder, silicon nitride powder, ball clay powder and fume silica; the admixture is vanadic oxide; and the bonding agent comprises sodium lignosulponate solution with concentration of 50 percent, polyvinyl alcohol solution with concentration of 6 percent and dextrine. The material ensures that the preparation process is more reasonable and economic by optimizing various component and the consumption thereof; during sintering, electric heating is not needed, N2 gas is not needed for protection and used as a reaction material, and the high-temperature ceramic material with favorable performance can be obtained by only heating a gas furnace in the oxidizing atmosphere. The invention also discloses a preparation method for the material, which adopts a ramming process and has the characteristics of little investment on equipment, short production flow, low energy consumption, wide application range and the like.

Description

technical field [0001] The invention belongs to the technical field of high-temperature ceramic materials, and relates to a silicon oxynitride bonded silicon carbide high-temperature ceramic material and a preparation method thereof. Background technique [0002] Silicon carbide is a typical polycrystalline compound, which can be divided into two types: α-silicon carbide and β-silicon carbide, among which β-silicon carbide is the main raw material for preparing silicon carbide ceramics. Silicon carbide refractory has excellent high-temperature properties such as high strength, large thermal conductivity, good thermal shock resistance, wear resistance, and corrosion resistance. It is a high-quality high-temperature ceramic material; it is widely used in metallurgy, energy, chemical and other industries. [0003] At present, silicon carbide products on the market mainly fall into the following two categories according to their combination methods: [0004] (1), the traditiona...

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Problems solved by technology

However, the research on this kind of material is not yet mature enough, and the pressure forming process still has problems such as large equipment investment, high energy consumption, long production cycle, etc., and the production cost is still too high, thus limiting its wide application; still need a lot of research In-depth research work to improve material performance while reducing production costs

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