Fillers for investment and refractory die materials

Details Fillers for investment and refractory die materials Fillers for investment and refractory die materials

1992-01-28

1993-01-19

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Dental

106 383, 106 3835, 106 389, C09K 300, B28B 728

Patent

active

051804271

ABSTRACT:
Phosphate-bonded investments and refractory die materials are provided upon which dental porcelains and/or alloy powders can be sintered. Inorganic fillers are mixed with appropriate binders to produce mold materials which exhibit very high thermal expansion properties without exhibiting any large or sudden change in their thermal expansion verse temperature profile. Investments and refractory die materials having thermal expansions of greater than 0.80% in the range of 25.degree.-500.degree. C. are provided by incorporating leucite (KAlSi.sub.2 O.sub.6) or calcium difluoride (CaF.sub.2), or both, as fillers for investments and refractory die materials.

REFERENCES:
patent: 3647488 (1972-03-01), Brigham et al.
patent: 4478641 (1984-10-01), Adair et al.
patent: 4536216 (1985-08-01), Kaluzhsky et al.
patent: 4604142 (1986-08-01), Kamohara et al.
patent: 4709741 (1987-12-01), Nakamura
patent: 4798536 (1989-01-01), Katz
patent: 4830083 (1989-05-01), Nakamuar
patent: 4947926 (1990-08-01), Ogino et al.
patent: 5022921 (1991-06-01), Aitken

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