SINTERING OF SILICON NITRIDE USING BE ADDITIVE

摘要

RD-9413 A particulate dispersion of silicon nitride and beryllium additive is shaped into a green body and sintered at a temperature ranging from about 1900.degree.C to about 2200.degree.C in a sintering atmosphere of nitrogen at superatmospheric pressure, producing a pre-shaped polycrystalline silicon nitride sintered body with a density ranging from about 80% to about 100% of the theoretical density of silicon nitride. This method of producing pre-shaped silicon nitride sintered bodies is useful in the production of components for high temperature heat engines.