Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1979-06-18
1981-01-13
Arnold, Donald J.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
106 44, 264 66, C04B 3556
Patent
active
042449022
ABSTRACT:
A method of forming a silicon carbide ceramic material without forming large areas of a feathered alpha silicon carbide microstructure is disclosed. Basically, the method involves heating the silicon carbide material to a temperature in a range from about 1850.degree. C. to about 1920.degree. C., preferably about 1900.degree. C., and maintaining the material at the selected temperature for a period of time from about 6 hours to about 12 hours. Such a heating cycle produces silicon carbide ceramic material which does not have large areas of a feathered alpha silicon carbide microstructure therein.
REFERENCES:
patent: 3998646 (1976-12-01), Weaver
patent: 4041117 (1977-08-01), Prochazka
patent: 4080415 (1978-03-01), Coppola et al.
patent: 4120827 (1978-10-01), Boos et al.
patent: 4135938 (1979-01-01), Murata et al.
Arnold Donald J.
Ford Motor Company
Johnson Olin B.
Johnson William E.
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