Method of manufacturing bodies of silicon nitride

Details Method of manufacturing bodies of silicon nitride Method of manufacturing bodies of silicon nitride

1980-10-10

1984-06-19

Parrish, John

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264332, B22F 314

Patent

active

044552750

ABSTRACT:
Bodies of silicon nitride are produced by enclosing a silicon nitride powder in a gas-tight glass casing and subjecting the casing to isostatic pressure using gas as a pressure medium at a temperature of at least 1600.degree. C. and a pressure of at least 100 MPa. The casing is a glass having a high softening point. The casing is evacuated and sealed before compressing. The product may be pre-formed by isostatic compacting at a pressure of at least 100 MPa at a temperature considerably below the sintering temperature. The casing is cooled at a rate of at most 1000.degree. C. per hour and at a pressure of not over 10 MPa.

REFERENCES:
patent: 3419935 (1969-01-01), Pfeiler
patent: 3469976 (1969-09-01), Iler
patent: 3887411 (1975-06-01), Goodyear
patent: 4381931 (1983-05-01), Hunold

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