Glazed ceramic substrate

Details Glazed ceramic substrate Glazed ceramic substrate

1981-12-22

1983-08-02

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of quartz or glass

428427, 428432, 501 67, B32B 900

Patent

active

043966829

ABSTRACT:
A glazed ceramic substrate for use in electric or electronic devices, obtained by forming a glass coating layer directly on a major surface of a ceramic substrate such as an alumina substrate. The glass as the material of the coating layer contains 50-60 Wt % of SiO.sub.2, 10-30 Wt % of Al.sub.2 O.sub.3, 15-30 Wt % of CaO and MgO, and 2-6 Wt % of ZrO.sub.2 as essential components, optionally with the addition of small amount(s) of at least one of TiO.sub.2, BaO, ZnO, PbO, P.sub.2 O.sub.5, B.sub.2 O.sub.3, Na.sub.2 O and K.sub.2 O. The coating layer formed of this glass is excellent in its high-temperature stability, so that the glazed ceramic substrate is particularly suitable for use in thermal heads of thermal printing devices.

REFERENCES:
patent: 3497336 (1970-12-01), Simmons
patent: 3923528 (1975-11-01), Kume
patent: 4287260 (1981-09-01), Prall
Schmidt-Voss, "Die Rohstoffe zur Glaserzeugung", (The Raw Materials for the Production of Glass), 2nd Edition, Leipzig, 1958, p. 243.

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