Whisker-reinforced ceramics

Details Whisker-reinforced ceramics Whisker-reinforced ceramics

1988-11-29

1990-09-11

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 95, 501 97, 501 98, C04B 3558

Patent

active

049563173

ABSTRACT:
Whisker-reinforced ceramics with high fracture toughness and strength consists essentially of 5-40 weight % SiC including SiC whiskers, 1-30 weight % of at least one kind of oxides of elements selected from the group consisting of Al, Sc, Y and rare-earth elements, and the balance being silicon oxynitride constituents, wherein said SiC whiskers are present in an amount of no less than 5 weight % of the total essential constituents.
The silicon oxynitride constituents are Si.sub.2 N.sub.2 O or a mixture of silicon nitride and silica (0.83-1.22 by molar ratio), or a mixture of Si.sub.2 N.sub.2 O and said mixture of silicon nitride and silica. Silicon oxynitride and SiC phases are predominant.

REFERENCES:
patent: 3833389 (1974-09-01), Komeya et al.
patent: 4506021 (1985-03-01), Jack et al.
patent: 4789277 (1988-12-01), Rhodes et al.
patent: 4795724 (1989-01-01), Soma et al.
patent: 4801564 (1989-01-01), Baba
Lundberg et al., "SiC-Whisker-Reinforced Si.sub.3 N.sub.4 Composites", Am. Ceram. Soc. Bull., 66[2] 330-33 (1987).

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