Gel casting molding process for mass production of silicon nitride ceramics

Abstract

Provided is a gel casting molding process for mass production of silicon nitride ceramics. The process comprises a solvent, an organic monomer, a crosslinking agent, dispersing agents, a silicon nitride powder, aqua ammonia, a catalyst and an initiator. The gel casting molding process is convenient to operate, can reduce the surface roughness of the silicon nitride ceramics, and can solve inhomogeneous gradient distribution of the molding density and easy deformation.

Description

Technical field: [0001] The invention relates to a gel injection molding process for batch production of silicon nitride ceramics. Background technique: [0002] Silicon nitride ceramics is a special ceramic material with α or β as the main crystal phase. It has a series of excellent properties, such as high strength, high toughness, high thermal conductivity, excellent high temperature creep resistance, and good wear resistance. And good self-lubricating ability. It has unique advantages in the manufacture of high-temperature blades, high-temperature valves, high-temperature nozzles, bearings, and cutting tools. [0003] The traditional method of preparing silicon nitride ceramics includes: dry pressing, hot die casting or static pressing, degreasing, and finally pressureless sintering or pressure sintering at 1600°C-1900°C. The sintering atmosphere is generally a nitrogen atmosphere. Avoid silicon nitride decomposition and gasification in this sintering temperature range...

AI Technical Summary

Problems solved by technology

[0005] In order to meet the surface roughness requirements of complex parts, ceramic surfaces are usually treated, including mechanical polishing, but the above-mentioned treatment operations are complicated, and this treatment will increase production costs and the rate of defective products will also increase