High-strength ceramic bodies

Details High-strength ceramic bodies High-strength ceramic bodies

1980-07-14

1981-11-03

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 60, 264322, 501 1, 501 87, 501 88, 501 94, 501102, 501108, 501126, 501132, 501133, 501153, 501154, C04B 3500, C04B 3510, C04B 3540, C04B 3571

Patent

active

042983851

ABSTRACT:
A sintered ceramic body of high toughness, consisting of an isotropic ceramic matrix (e.g. Al.sub.2 O.sub.3) and at least one therein-dispersed phase (ZrO.sub.2, HzO.sub.2) of ceramic embedment material formed from a powder consisting of particles having an average diameter from 0.3 to 1.25 .mu.m, wherein the ceramic embedment material is present in different enantiotropic solid modifications at the firing temperature of the ceramic body and below the firing temperature, whose densities are substantially different, and the ceramic body is shot through with extremely fine microfractures in high density.

REFERENCES:
patent: 3247000 (1966-04-01), Taylor
patent: 3740340 (1973-06-01), Riley et al.
patent: 3887384 (1975-06-01), Hulse et al.
patent: 3916585 (1975-11-01), Barks
patent: 4067745 (1978-01-01), Garvie et al.
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4103063 (1978-07-01), Hulse
patent: 4125407 (1978-11-01), Ueno
patent: 4184882 (1980-01-01), Lange
patent: 4187116 (1980-02-01), Lange
patent: 4218253 (1980-08-01), Dworak et al.
patent: 4249914 (1981-02-01), Ogawa et al.
Claussen, N. "Fracture Toughness of Al.sub.2 O.sub.3 with an Unstabilized ZrO.sub.2 Dispersed Phase", J. Am. Cer. Soc. Jan.-Feb., 1976, 59, pp. 49-51.
Claussen, N. et al. "Toughening of Ceramic Composites by Oriented Nucleation of Microcracks", J. Am. Cer. Soc. 59, pp. 457-458 (Sep.-Oct. 1976).

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