Process for producing beta silicon nitride fibers

Details Process for producing beta silicon nitride fibers Process for producing beta silicon nitride fibers

1986-10-24

1988-01-05

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 92, 501 95, 501 96, 423344, C04B 3558, C01B 21068

Patent

active

047176938

ABSTRACT:
A process is disclosed for producing beta silicon nitride fibers. The process involves heating a green article of a silicon nitride based material in a furnace at a temperature of from about 1700.degree. C. to about 2000.degree. C. at a pressure of nitrogen gas of at least about 100 psig for a sufficient time to form silicon nitride fibers, the major portion of which are beta silicon nitride fibers. The heating step is carried out with the article covered with a cover made of silicon carbide or silicon nitride. Alternately, the article can be in a container of silicon nitride or silicon carbide and covered with the cover.

REFERENCES:
patent: 3394991 (1968-07-01), Evans
patent: 3413090 (1968-11-01), Krock et al.
patent: 3677713 (1972-07-01), Evans

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