Process for sintering silicon nitride articles

Details Process for sintering silicon nitride articles Process for sintering silicon nitride articles

1986-01-31

1987-09-29

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, C04B 3564

Patent

active

046967788

ABSTRACT:
A process for sintering silicon nitride articles to a density greater than 98% of theoretical density comprises the steps of heating a silicon nitride article in a covered container to a temperature equal to or greater than the liquidus temperature of the sintering aids contained in the silicon nitride article in a protective atmosphere and at a pressure for a period of time sufficient to obtain a density greater than 98% of theoretical density. The pressure is changed during the sintering step to displace the protective atmosphere in the closed container.

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