Preparation process of large-size pressureless sintered silicon carbide ceramic material

Abstract

The invention discloses a preparation process of a large-size pressureless sintered silicon carbide ceramic material, and belongs to the technical field of ceramics. The method comprises the following steps of: S1, selecting silicon carbide powder for later use, S2, stirring, mixing, granulating and drying the selected silicon carbide powder, S3, isostatically pressing the silicon carbide powder to form ceramic, S4, sintering the pressed and formed ceramic to obtain the pressureless sintered silicon carbide ceramic. According to the invention, the traditional sintering process is broken through, the 99.9% silicon carbide micro powder is sintered at a high temperature of 22000 DEG C under a non-pressure condition and in an argon atmosphere, the density reaches 3.15 g / cm < 3 >, the thermal conductivity is good, the thermal conductivity reaches 74 W / m.k, the Knoop hardness is 2600 kg / mm < 2 >, and the sintered non-pressure silicon carbide material has super-strong fracture toughness, relatively high fracture strength, zero porosity, density of 3.15 g / cm < 2 >, better wear resistance and corrosion resistance, and the highest working temperature of 16100 DEG C.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a preparation process of a large-size pressureless sintered silicon carbide ceramic material. Background technique [0002] Silicon carbide ceramic materials have a wide range of applications. Pressureless sintered silicon carbide materials are not only used in the glass industry and smelting industry, but also for military equipment; silicon carbide ceramic materials have high temperature strength, good thermal conductivity, and oxidation resistance Strong, wear-resistant, high hardness, thermal shock resistance and chemical corrosion resistance, etc., are widely favored in the glass industry, high-end ceramic kilns, etc. Silicon carbide ceramics and their composite materials have become a new family in the material family . [0003] Due to the difficulty of sintering process and high production cost of large-size silicon carbide ceramic materials, its research and application...

AI Technical Summary

Problems solved by technology

For domestic liquid crystal glass furnaces, with the expansion of production capacity in recent years, the demand for large-size silicon carbide ceramic materials has increased, and imports have been restricted, making it impossible to obtain large-size silicon carbide high-strength materials. Therefore, there is an urgent need for a large-size pressure-free Preparation process of sintered silicon carbide ceramic material

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