Shrink-free ceramic and method and raw batch for the manufacture

Details Shrink-free ceramic and method and raw batch for the manufacture Shrink-free ceramic and method and raw batch for the manufacture

1979-12-14

1981-05-05

Carter, Herbert T.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 35, 264 65, C04B 3544, C04B 3504, C04B 3510

Patent

active

042656699

ABSTRACT:
The invention provides a hard, strong ceramic body and a ceramic raw batch and method for manufacture whereby the body, after being formed of the raw batch in the shape and size desired, can then be fired to monolithic structure without any shrinkage or distortion during the firing operation. The raw batch contains aluminum oxide, magnesium oxide, glass frit and a silicone resin, these constituents being present in a ratio such that after the firing operation the resulting monolithic body contains from about 70% to 95% by weight crystalline material and the remainder interstitial glass, the crystalline material consisting predominantly of magnesium aluminate spinel and alumina. The ceramic and method have particular utility for making dental crowns and other dental appliances where a precise fit along with high strength and wear resistance are desirable.

REFERENCES:
patent: 3361583 (1968-01-01), Elarde et al.
patent: 3516810 (1970-06-01), Ivey et al.
patent: 3549393 (1970-12-01), Elarde
patent: 3676569 (1972-07-01), Thompson
patent: 4089038 (1978-05-01), Bacher
Ware, R. K., et al., "Porcelains Having Low-Firing Shrinkage", Ceramic Bulletin, vol. 43, No. 5, (1964), pp. 383-389.

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