Process for preparing dual coat ceramic layer by single firing

Details Process for preparing dual coat ceramic layer by single firing Process for preparing dual coat ceramic layer by single firing

B - Operations, Transporting

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B05D 3/02 (2006.01) C03C 8/00 (2006.01) C03C 8/02 (2006.01) C03C 8/04 (2006.01) C03C 8/06 (2006.01) C03C 8/08 (2006.01) C03C 8/12 (2006.01) C23D 5/04 (2006.01)

Patent

CA 1113804

ABSTRACT OF THE DISCLOSURE A process and resulting product are disclosed charac- terized 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 boro- fluorosilicate glass.

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