Process for producing non-porous coating for corundum substrates

Details Process for producing non-porous coating for corundum substrates Process for producing non-porous coating for corundum substrates

1975-12-01

1977-01-18

Husack, Ralph

Coating processes

With post-treatment of coating or coating material

Heating or drying

427193, 427376A, 427399, 428420, 428428, 428446, 428539, B05D 302, B32B 904, B32B 1304

Patent

active

040040526

ABSTRACT:
A process for producing a non-porous coating for corundum substrates with a corundum content of 90 to 100% the process comprises applying a barium, calcium or strontium alumosilicate glaze to the substrate, followed by heat treatment of the substrate at a temperature within a range of from 1,350 to 1,650.degree.C at a heating rate of from 100.degree. to 500.degree. C per hour, and thereafter cooling at a rate of about 150.degree. C per hour, thus giving a glass-ceramic coating on the substrate. The process is useful, mainly, for producing integral circuits and other micro-circuits and precision resistors.

REFERENCES:
patent: 3023492 (1962-03-01), Bristow
patent: 3049447 (1962-08-01), Knapp
patent: 3384508 (1968-05-01), Bopp et al.
patent: 3473999 (1969-10-01), Muchow
patent: 3676204 (1972-07-01), Eppler
patent: 3679464 (1972-07-01), Eppler
patent: 3808046 (1974-04-01), Davey
Silica and the Silicates, Audley, 1921, p. 217.

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