Process for forming silicon carbide ceramic ball

Abstract

The invention provides a silicon carbide ceramic ball. The silicon carbide ceramic ball is prepared by mixing, granulating, seeding, forming, sintering and grinding, production of seeds, forming, sintering and grinding from, by weight parts, a main ingredient and an auxiliary, wherein the main ingredient includes 87%-96% of silicon carbide fine powder, 5%-11% of high residual carbon phenolic resinand 1.2%-5% of sintering aid, wherein the sintering aid is at least one of B, C, B4C, Al2O3 and Y2O3. The auxiliary includes binder accounting for 0.9%-11% of the weight of the main ingredient and dispersing agent accounting for 0.5%-3.5% the weight of the main ingredient, and the binder is at least one of polyvinyl alcohol, dextrin and carboxymethyl cellulose; and the dispersing agent is at least one of polyethylene glycol, tetramethylammonium hydroxide, aluminophosphate, and polyacrylic acid. The silicon carbide ceramic ball has high density and stable chemical property; the silicon carbideceramic ball can meet the preparation of silicon carbide ceramic balls of multiple specifications, the range is wide, and the silicon carbide ceramic balls ranging from 1 mm to 50 mm can be produced.The one-time investment is small, and the production expansion is easy.

Description

technical field [0001] The invention relates to the field of ceramic balls and preparation methods, in particular to a molding process of silicon carbide ceramic balls Background technique [0002] Silicon carbide ceramics have high strength, low creep, friction and wear resistance, corrosion resistance and good oxidation resistance, and their excellent mechanical properties, low thermal expansion coefficient and high thermal conductivity determine the properties of silicon carbide ceramics. Thermal shock resistance is very good. Based on the above advantages, silicon carbide ceramic balls, as key components of grinding balls, ceramic bearings, and ball valves, have broad application prospects in harsh working conditions such as high temperature, strong acid, strong alkali, and impact resistance. [0003] The ball forming methods in the prior art of silicon carbide ceramic balls mainly include the following: [0004] (1) Extrusion method: The powder is sintered to obtain c...

AI Technical Summary

Problems solved by technology

The disadvantage is that the number of products sintered in each furnace is small, and the mold cannot be used multiple times

[0008] (5) Hot isostatic pressing sintering method: Although the ceramic balls sintered by hot isostatic pressing have high density and good spherical shape, compared with other preparation methods, the cost is too high and the efficiency is low, so it is not suitable for large-scale production