Special dispersant for hydraulic overflow classification for high-purity superfine silicon carbide micro powder for linear cutting and using method

Abstract

The invention relates to a special dispersant for hydraulic overflow classification for high-purity superfine silicon carbide micro powder for linear cutting and a using method, and belongs to the preparation of high-purity silicon carbide micro powder. The special dispersant is prepared from the following raw materials in percentage by mass: 50 to 70 percent of pure water, 25 percent of tetramethylammonium hydroxide, 15 to 35 percent of aqueous solution, 5 to 20 percent of alkyl alcohol amine, 2 to 10 percent of ethylene diamine tetraacetic acid (EDTA), 0.1 to 2.0 percent of fatty alcohol-polyoxyethylene ether, 0.5 to 3.0 percent of alkylpheol ethoxylate and 0.1 to 3.0 percent of bacteriostatic agent. The invention provides the special dispersant for the hydraulic overflow classification for the high-purity superfine silicon carbide micro powder for the linear cutting and a preparation method and the using method thereof, wherein the special dispersant has the advantages of short hydraulic overflow classification period in the production process of the high-purity superfine silicon carbide micro powder for the linear cutting, high yield, uniform product granularity distribution, difficult agglomeration of granules and capability of meeting the requirement of the linear cutting industry. The special dispersant can remarkably improve the potential of the high-purity superfine silicon carbide micro powder for the linear cutting and reduce the viscosity of slurry so as to remarkably optimize the rheological property of the slurry.

Description

technical field [0001] The invention is a high-purity ultrafine silicon carbide micropowder hydraulic overflow grading special dispersant for wire cutting and its preparation and use method. It belongs to the preparation of silicon carbide high-purity micropowder. Background technique [0002] The hardness of silicon carbide is second only to natural diamond and a kind of black corundum. Silicon carbide particles in a certain particle size range are high-quality grinding materials. The high-purity ultra-fine silicon carbide powder used as wire cutting has a particle size of several microns to 20 microns, and has strict requirements on the accuracy and consistency of particle size classification, and the particle surface energy is relatively large. In the preparation process, hydraulic overflow classification is adopted. In the hydraulic overflow classification process, the dispersion performance of the dispersant has a great influence on the length of the classification cy...

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Problems solved by technology

[0003] In the prior art, dispersants composed of sodium tripolyphosphate, sodium pyrophosphate, water glass and other raw materials are used. These dispersants cannot effectively disperse silicon carbide particles, and the classification cycle is long and the yield is low during the classification process. And other problems, the particle size distribution of the final product is wide, and the particles are easy to agglomerate, which is difficult to meet the needs of the wire cutting industry.

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