Method of producing silicon carbide fibers

Details Method of producing silicon carbide fibers Method of producing silicon carbide fibers

1996-11-08

1997-10-14

Jones, Deborah

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

423345, 423440, 423460, 501 88, 501 95, 502178, C01B 3136

Patent

active

056769180

ABSTRACT:
Silicon carbide fibers having a high mechanical strength at a high temperature, an excellent heat resistance and a uniform structure are produced by activating carbon fibers which have been produced by heat-treating organic carbon fibers such as cellulose, polyacrylonitrile or petroleum pitch, polyimide or phenol resin fibers in an oxidative gas atmosphere and carbonizing the heat-treating organic fibers in an inert gas, with an activating gas, for example, water vapor, to convert them to the activated porous carbon fibers having a specific surface area of 100 to 3,000 m.sup.2 /g, a length of 5 mm or more and a thickness of 5 to 100 .mu.m; reacting the activated porous carbon fibers with a silicon monoxide gas at a temperature of 800.degree. C. to 2,000.degree. C. under a reduced pressure of 10.sup.2 Pa or less to convert them to silicon carbide fibers having a length of 5 mm or more, without generating whiskers; and optionally the resultant silicon carbide fibers are heat-treated at a temperature of 800.degree. C. to 2,000.degree. C. in the presence of an oxidative gas.

REFERENCES:
patent: 4914070 (1990-04-01), Ledoux et al.
patent: 4915924 (1990-04-01), Nadkarni et al.
patent: 4921686 (1990-05-01), Yoshida et al.
patent: 5427761 (1995-06-01), Grindatto et al.

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