Method for grading inside overflow of silicon carbide super micro powder

Abstract

The invention relates to a method for grading inside overflow of silicon carbide super micro powder. A purified silicon carbide mixed slurry is added into a grading kettle; a product with 2, 000 meshes is graded by using the inside overflow grading kettle with a diameter of 1,400 and a height of 5,000 into five specifications of the products, namely 2,000 meshes fine, 2,000 meshes, 1,500 meshes, 1,200 meshes and 1,000 meshes; and then the product with 2, 000 meshes fine is graded by using the inside overflow grading kettle with the diameter of 1,800 and the height of 5,000 into six specifications of the products, namely 8,000 meshes fine, 6,000 meshes, 4,000 meshes, 3,000 meshes, 2,500 meshes and 2,000 meshes. Water for overflow has the following water quality requirements: the water temperature is 20 DEG C; and the electric conductivity is less than 20. By adopting a production process of the inside overflow, the quality of the product is greatly improved, the variety and the number are increased, particle size distribution of the product is narrow, micro powder particles are even and the efficiency is high.

Description

technical field [0001] The invention relates to a production technology of silicon carbide, in particular to an inner overflow classification method of silicon carbide ultrafine powder. Background technique [0002] Silicon carbide has the characteristics of stable chemical properties, high thermal conductivity, low thermal expansion coefficient, high hardness, wear resistance and strong self-sharpness, and is widely used in processing cemented carbide and optical glass industries. In recent years, with the development of the world's semiconductor industry, silicon carbide has been widely used in multi-wire cutting and grinding of monocrystalline silicon, polycrystalline silicon, and piezoelectric quartz crystals, especially in the rapidly developing photovoltaic industry. Its quality is not only related to its purity, but also related to its particle fineness. The higher the purity, the finer the particle, the higher the application quality and the wider the application ran...

AI Technical Summary

Problems solved by technology

However, the traditional production method can only produce products of about 10 μm, and the particle size distribution is too large, the particles are uneven, and there are many impurities

However, the production time of sedimentation classification is too long and the production efficiency is too low. Although the efficiency of overflow production has been improved, the particle size distribution of the product is wide and the micropowder particles are uneven.