High strength alumina and process for producing same

Details High strength alumina and process for producing same High strength alumina and process for producing same

1992-11-03

1994-10-04

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501153, C04B 3510

Patent

active

053526430

ABSTRACT:
A vacuum hot pressed alumina material having small, isometric grains; a uniform distribution thereof; relatively low, predominantly transgranular porosity; and a density approaching the theoretical density of pure alumina produced by vacuum hot pressing alumina powder which contains at least 98.0% alumina, is substantially free of any sintering aids or any other additives, and has a median particle size less than about 3 microns, in a vacuum hot press operated at a temperature of at least about 1350.degree. C. and a pressure of at least 28 MPa (3500 PSI) for a sintering period of at least 1.5 hours. The vacuum hot pressed alumina material also has compressive strength, flexural strength, impact strength, and wear resistance superior to that for most conventional sintered alumina materials.

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patent: 4574003 (1986-03-01), Gerk
patent: 4735926 (1988-04-01), Ando et al.
patent: 4762655 (1988-08-01), Rhodes et al.
patent: 4952537 (1990-08-01), Hayashi et al.
patent: 4996177 (1991-02-01), Takagi et al.
patent: 5190567 (1993-03-01), Tamamaki et al.

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