Dual coat ceramic layer prepared by single firing

Details Dual coat ceramic layer prepared by single firing Dual coat ceramic layer prepared by single firing

1976-10-28

1978-08-29

Beck, Shrive P.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427193, 427201, 427203, 427204, 427205, 427376A, 427376C, 427376D, 427419C, 428428, 428538, B05D 104, B05D 302, B05D 136

Patent

active

041104870

ABSTRACT:
A process and resulting product are disclosed characterized by superimposing two layers of essentially dry, differing frit compositions onto a substrate and then firing only once to form a dual coat coherent ceramic layer. The composition of the two frits is such that the first or base coat fuses and stabilizes during the firing operation at temperatures below that at which the second or cover coat fuses and stabilizes. Desirably, the first layer forms an amorphous glass adherent to the substrate that is predominantly an alkaline oxide borosilicate glass and preferably an alkaline borofluorosilicate glass.

REFERENCES:
patent: 1459357 (1923-06-01), Booze
patent: 1898500 (1933-02-01), Schulz
patent: 2864721 (1958-12-01), King et al.
patent: 3086880 (1963-04-01), Compton
patent: 3216847 (1965-11-01), Armant
patent: 3513012 (1970-05-01), Point et al.
patent: 3647509 (1972-03-01), Keiser et al.
patent: 3671278 (1972-06-01), Borowski
patent: 3928668 (1975-12-01), Snow
patent: 3930062 (1975-12-01), Nedeljkovic

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