Method for production of silicon carbide granularity sand special for recrystallized silicon carbide

Abstract

The invention discloses a method for the production of silicon carbide granularity sand special for recrystallized silicon carbide, which is surface-smooth silicon carbide granularity sand special for recrystallized silicon carbide, obtained by the steps of shaping, separating, purifying, water-washing, dehydrating and drying the silicon carbide granularity sand with 80-100 microns of median diameter. The method for the production of silicon carbide granularity sand special for recrystallized silicon carbide according to the invention is simple, easy and convenient in operation, the produced granularity sand is centralized in granularity, good in mobility, large in tap density, less in impurities and free from fine powders, and all the silicon carbide produced according to the method has smooth surface and nearly spherical shape and is used for the production of recrystallized silicon carbide, therefore, compared with previous products, the produced product has the advantages of high volume density, small porosity, high oxidation resistance, compressive strength and high-temperature rupture strength, etc.

Description

technical field [0001] The invention relates to a micropowder treatment technology, in particular to a method for producing silicon carbide grain size sand special for recrystallized silicon carbide products. Background technique [0002] Recrystallized silicon carbide products have excellent properties such as high temperature strength, good thermal conductivity, small heat storage, and long service life, and are widely used in ceramics, petrochemicals, aerospace and other industrial sectors. It is used to make ceramic kiln furniture (roller rods, beams, shed boards, high-temperature burners, etc.), and the most typical use is as high-temperature kiln furniture for various industrial kilns, especially suitable for use under high temperature conditions above 1500 ° C. RSIC kiln furniture can significantly improve the filling efficiency. [0003] However, in the prior art, the silicon carbide particle size sand used to produce recrystallized silicon carbide products is crush...

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Problems solved by technology

[0003] However, in the prior art, the silicon carbide particle size sand used to produce recrystallized silicon carbide products is crushed with a pulverizer, so the silicon carbide particle size sand produced has various shapes, a wide range of particle size distribution, and low tap density (1.8 g / cm 3 The following), using such silicon carbide particle size sand for the production of recrystallized silicon carbide products, the products produced have the disadvantages of low bulk density, no anti-oxidation, high porosity, low compressive strength, low high temperature flexural strength, etc.

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