Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
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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Derrington James
Ericson Ivan L.
GTE Laboratories Incorporated
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