Method of producing glazed ceramic substrate

Details Method of producing glazed ceramic substrate Method of producing glazed ceramic substrate

1982-01-07

1983-08-16

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 56, 264 58, 264 60, 264 62, 264132, F27B 2100

Patent

active

043990894

ABSTRACT:
A method of producing a glazed ceramic substrate, which is useful for a hybrid integrated circuit or a thermal head of a thermal printer for instance, by applying a glass onto a major surface of a ceramic substrate, firing the substrate to form a molten glass layer on the substrate surface and cooling the fired substrate. To obtain the glazed ceramic substrate with high flatness despite the tendency of the substrate to warp due to difference in thermal expansion coefficient between the ceramic and the glass, a refractory base which supports the substrate during the firing and cooling steps is so shaped as to allow the substrate to deform during the firing step reversely to the expected warp at the cooling step, so that the warp at the cooling step is offset by the preceding deformation. For example, the upper surface of the base is shaped into a continuous and concave surface. As a modification, suitably shaped rib-like or pillar-like spacers are arranged on the top face of a flat base plate with intervals therebetween.

REFERENCES:
patent: 3406279 (1968-10-01), Ziver
patent: 3442994 (1969-05-01), Herbert
patent: 3792139 (1974-02-01), Weinstein
patent: 3904352 (1975-09-01), Thurnaver
patent: 4294635 (1981-10-01), Hurley
patent: 4313900 (1982-02-01), Gonzales, Jr. et al.
patent: 4340436 (1982-07-01), Dubetsky et al.

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