Fiber-reinforced silicon nitride ceramic

Details Fiber-reinforced silicon nitride ceramic Fiber-reinforced silicon nitride ceramic

1991-12-17

1993-02-16

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 92, 501 97, 501 98, C04B 3558, C04B 3580

Patent

active

051871270

ABSTRACT:
According to the present invention, there is provided a fiber-reinforced silicon nitride ceramic prepared by sintering a starting composition containing silicon nitride, at least one sintering additive and silicon carbide fiber or a fiber containing silicon carbide as a major constituent (to be referred to as a silicon carbide fiber hereinafter), characterized in that said silicon carbide fiber has a length of 200 .mu.m or more, and is contained 5 to 50 wt %, and said sintering additive is contained 0.1 to 30 wt % and is selected from the group consisting of an oxide, a nitride, and a carbide of titanium or zirconium, a composite oxide of titanium and zirconium, magnesia, and spinel. When the contents of the fibers and the sintering addtives fall within the ranges according to the present invention, a high strength and a large toughness value are simultaneously obtained.

REFERENCES:
patent: 4507224 (1985-03-01), Toibara et al.
patent: 4560669 (1985-12-01), Matsuhiro et al.
patent: 4609633 (1986-09-01), Fukuhara et al.
patent: 4652276 (1987-03-01), Burden
patent: 4746636 (1988-05-01), Yokoyama
patent: 4777155 (1988-10-01), Baba et al.
patent: 4801564 (1989-01-01), Baba
patent: 4855262 (1989-08-01), Richon et al.
Suresh et al., "Fracture of Si.sub.3 N.sub.4 -SiC Whisker Composites Under Cyclic Loads", J. Am. Cev. Soc. 71[3](1988) pp. 158-161.

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