Production of silicon nitride sintered body

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

1986-11-18

1988-05-31

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 85, C04B 3564

Patent

active

047479841

ABSTRACT:
A process for manufacturing a silicon nitride sintered body comprises molding a mixed powder of a silicon nitride starting material and a sintering aid and firing a thus obtained molding. The firing is carried out in an N.sub.2 atmosphere or a mixed atmosphere of N.sub.2 and an inert gas to which CO.sub.2 or a mixed gas of CO.sub.2 and CO is added. Thereby, an O.sub.2 partial pressure is increased to restrain the evaporation of SiO.sub.2 and nitriding of SiO.sub.2 during the firing. The silicon nitride sintered body suffers almost no deterioration of the fired surface resulting from the evaporation of SiO.sub.2 and the nitriding of SiO.sub.2, and exhibits substantially equal four point bending strength and oxidation resistance with respect to the fired surface and the inside thereof.

REFERENCES:
patent: 4383957 (1983-05-01), Yamakawa et al.
patent: 4511525 (1985-04-01), Tsuge et al.

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