Zirconia ceramics

Details Zirconia ceramics Zirconia ceramics

1993-03-25

1994-01-18

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501104, C04B 3548

Patent

active

052799956

ABSTRACT:
A zirconia ceramic composed of crystals which scarcely undergo phase transformation from tetragonal system to monoclinic in the temperature range of from 100.degree. C. to 300.degree. C. even in the presence of water vapor or water is disclosed, said zirconia ceramic comprising at least 93% by weight of partially stabilized zirconia mainly composed of tetragonal crystals and containing mainly Y.sub.2 O.sub.3 and ZrO.sub.2 at the former to the latter molar ratio of from 2/98 to 4.5/95.5 and balance of at least one of the oxides selected from the group consisting of boron oxide, germanium oxide, and gallium oxide, wherein the content of the boron oxide is 1% by weight or less.

REFERENCES:
patent: 1565472 (1925-12-01), LeCoultre
patent: 4303447 (1981-12-01), Buchanan et al.
patent: 4360598 (1982-11-01), Otagiri et al.
patent: 4764491 (1988-08-01), Quadir
patent: 4985229 (1991-01-01), Obitsu et al.

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