Ceramic material based on alumina and refractory hard constituen

Details Ceramic material based on alumina and refractory hard constituen Ceramic material based on alumina and refractory hard constituen

1987-03-27

1989-02-14

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501132, 501 95, 501 98, 501 87, 501 93, 501104, 501 96, C04B 3510, C04B 3512, C04B 3548

Patent

active

048046450

ABSTRACT:
The invention relates to a sintered body of a ceramic composite material based on alumina, refractory hard phases and ZrO.sub.2, HfO.sub.2 and/or partially stabilized ZrO.sub.2 with a relative density of more than 98%. The sintered body according to the invention has chromium integrated in amounts corresponding to in all 1-20 weight % and ZrO.sub.2, HfO.sub.2 and/or partially stabilized ZrO.sub.2 present as 2-16 weight % with these latter phases present to more than 70% in the tetragonal crystal modification. Furthermore, the refractory hard constituents are present as particles with a grain size of less than 10 .mu.m and/or as whiskers or fibers with a diameter of less than 5 .mu.m and a length/diameter ratio of >10.

REFERENCES:
patent: 2271368 (1942-01-01), Fulcher et al.
patent: 4325710 (1982-04-01), Tanaka et al.
patent: 4374897 (1983-02-01), Yamaguchi
patent: 4533647 (1985-08-01), Tien
patent: 4543343 (1985-09-01), Iyori et al.

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