Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1976-08-02
1978-04-18
Douglas, Winston A.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 47R, 106 49, 106 52, 106 53, 106 54, 252454, 252458, 252459, 428432, 126 19R, C03C 502
Patent
active
040849759
ABSTRACT:
A frit composition is disclosed adapted to be applied to a metal substrate containing iron and fired to form a ceramic coat. The frit composition comprises a primary devitrifiable frit adapted to fuse at a firing temperature and upon cooling form devitrified particles; and a secondary frit containing a volatilizable metal oxide adapted to form at a firing temperature substantially an amorphous glass and precipitate crystals of the volatilizable metal oxide. The crystals at least partially volatilize at the firing temperature to provide protective vapors effective to inhibit oxidation of the substrate. Upon cooling, the amorphous glass of the secondary frit bonds the devitrified particles of the primary frit one to another. Preferably, the devitrified particles of the primary frit provide a porous ceramic coat such as on a surface of a self-cleaning cooking device exposed to cooking residues. In this case, the primary frit may also contain an oxidation catalyst.
REFERENCES:
patent: 2495837 (1950-01-01), Porter
patent: 2753271 (1956-07-01), Treptow
patent: 3263675 (1966-08-01), Ria et al.
patent: 3266477 (1966-08-01), Stiles
patent: 3547098 (1970-12-01), Lee
patent: 3671278 (1972-06-01), Borowski
patent: 3761293 (1973-09-01), Carini et al.
Bell Mark
Douglas Winston A.
Ferro Corporation
Simmons Milton L.
Taylor Wesley B.
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