Lead-free glaze for alumina bodies

Details Lead-free glaze for alumina bodies Lead-free glaze for alumina bodies

1980-02-08

1981-03-17

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 46, 106 54, 106 734, C03C 502, C04B 3326

Patent

active

042564972

ABSTRACT:
A high-silica ceramic glaze, having a low coefficient of thermal expansion, suitable for application to alumina bodies, is disclosed. The glaze consists essentially, by weight percent, of 35 to 54 percent SiO.sub.2, from 7 to 11 percent Al.sub.2 O.sub.3, from 17 to 25 percent B.sub.2 O.sub.3, from 2 to 3 percent CaO, from 2 to 21/2 percent ZnO, from 41/4 to 5 percent Na.sub.2 O, from 81/2 to 21 percent SrO, and from 0.7 to 1 percent of a mixture of K.sub.2 O, Li.sub.2 O and MgO, and minor impurities.

REFERENCES:
patent: 3929496 (1975-12-01), Asano et al.
patent: 4084976 (1978-04-01), Hinton
patent: 4120733 (1978-10-01), Knapp

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