Production of high-strength ceramic bodies of alumina and unstab

Details Production of high-strength ceramic bodies of alumina and unstab Production of high-strength ceramic bodies of alumina and unstab

1981-07-06

1983-12-06

McCarthy, Helen M.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264332, 501 94, 501105, 501153, C04B 3500, C04B 3510, C04B 3548, C04B 3571

Patent

active

044193114

ABSTRACT:
A method of preparing a ceramic body of high toughness from an aluminum oxide matrix forming ceramic material by using a ceramic embedment material to generate tensile stresses for the formation of controlled microfissures, is provided. The ceramic embedment material comprises 4 to 25% of the volume of the body to be formed, of unstabilized zirconium dioxide and/or hafnium dioxide with a particle size of 0.3 to 1.25 um. This is mixed with the aluminum oxide material and the mixture is sintered by hot-pressing in a mold at a temperature of 1400.degree. C. to 1500.degree. C.

REFERENCES:
patent: 3247000 (1966-04-01), Taylor
patent: 4067745 (1978-01-01), Garvie et al.
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4205964 (1980-06-01), Hill
patent: 4322249 (1982-03-01), Claussen et al.

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