Ceramic materials

Details Ceramic materials Ceramic materials

1975-10-24

1978-01-10

Poer, J.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

C04B 3548

Patent

active

040677451

ABSTRACT:
Calcia-partially-stabilized zirconia ceramic materials which contain between 3.3 and 4.7 percent of calcia by weight. Such materials have a fine-scale two-phase microstructure substantially consisting of metastable, tetragonal domains of a critical size within cubic matrix grains, which domains, in regions of high stress, irreversibly transform to normal monoclinic form upon stressing of the body.
The materials are produced by firing a zirconia body containing between 3.3 and 4.7 percent by weight of calcia at a temperature between 1700.degree. C and 1950.degree. C and allowing the body to cool at an average rate of at least 175.degree. C per hour to a temperature within the range 1200.degree. to 1450.degree. C; followed by ageing with said temperature range for a time such that peak strength is obtained.

REFERENCES:
patent: 3620781 (1971-11-01), Garvie
patent: 3887387 (1975-06-01), Sturhahn
patent: 3929498 (1975-12-01), Hancock et al.

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