Compositions: ceramic – Ceramic compositions – Refractory
Patent
1988-01-25
1989-08-01
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501105, C04B 3548
Patent
active
048533530
ABSTRACT:
A ceramic body has a surface region that contains tetragonal zirconia. The body is partially stabilized with yttria and, optionally, ceria. Substantially the entire surface region is composed of recrystallized tetragonal strain free grains of yttrium oxide zirconium oxide. The content of yttrium in the surface region is substantially the same as the average content of yttrium in the ceramic body, and the surface region is covered with a thin layer of stable tetragonal grains.
REFERENCES:
patent: 4525464 (1985-06-01), Claussen et al.
patent: 4690911 (1987-09-01), Nakada
Claussen, "Microstructural Design of Zirconia-Toughened Ceramics (ZTC)", Advances in Ceramics, vol. 12, Science and Technology of Zirconia II, American Ceramic Society, Inc., Columbus, Ohio (1984) pp. 325-351.
Shigeto et al., "Transformation Toughened Zirconia (Y-PSZ) Ceramics TASZIC", Technical Paper No. 830520, Toshiba Ceramics Co., Ltd.
Antrim Robert
Reidinger Franz
Whalen Philip J.
Allied-Signal Inc.
Bell Mark L.
Buff Ernest D.
Fuchs Gerhard H,.
Green Anthony J.
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