Production of silicon nitride sintered body

Details Production of silicon nitride sintered body Production of silicon nitride sintered body

1987-02-09

1989-01-31

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 264 67, C04B 3332

Patent

active

048014141

ABSTRACT:
A process is disclosed for producing silicon nitride sintered bodies. The process comprises the steps of molding a formulated starting material of silicon nitride, firing a thus obtained molding to obtain a fired body having a desired shape, and then thermally treating the fired body in such an atmosphere that has an oxygen partial pressure higher than that in a firing atmosphere and suppresses a weight increment in oxidation to not more than 0.1 mg/cm.sup.2. Working may be done to obtain the desired shape of the fired body after the firing but before the thermal treatment.

REFERENCES:
patent: 3983198 (1976-09-01), Mongels
patent: 4457958 (1984-07-01), Lange et al.
patent: 4702869 (1987-10-01), Higuchi et al.
Petrovic et al., The Strength of Silicon Nitride After Exposure to Different Environments, in Ceramics for High-Performance Applications (1974), pp. 397-414.

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