Carbon coated silicon carbide, silicon nitride or sialon fibers

Details Carbon coated silicon carbide, silicon nitride or sialon fibers Carbon coated silicon carbide, silicon nitride or sialon fibers

1989-12-20

1991-10-08

Lesmes, George F.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 95, 501 96, 428297, 428367, 428368, 428378, 428408, 428902, C04B 3552, C04B 3502, B32B 900

Patent

active

050554301

ABSTRACT:
The present invention provides fiber-reinforced ceramics containing at least one member of fibers and whiskers as distributed in a sintering ceramic matrix, which comprises the ceramic matrix being composed mainly of SiC, Si.sub.3 N.sub.4 and Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z, where 0<z.ltoreq.4, the fibers and the whiskers being composed of at least one of SiC, Si.sub.3 N.sub.4 and Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z, where 0<z.ltoreq.4, and a coating film of C, B or BN being provided on the surfaces of the fibers and the whiskers. The fiber-reinforced ceramics have a high fracture toughness, K.sub.lc, and a high bending strength, particularly k.sub.lc of at least 10 MN/m.sup.3/2 and a bending strength of at least 50 kg/mm.sup.2.

REFERENCES:
patent: 4131697 (1978-12-01), Random et al.
patent: 4275095 (1981-06-01), Warren
patent: 4397901 (1983-08-01), Warren
patent: 4405685 (1983-09-01), Honjo et al.
patent: 4605588 (1986-08-01), Simpson et al.
patent: 4642271 (1987-02-01), Rice

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