Lead-free glaze for alumina bodies

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

1977-07-20

1978-04-18

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

29 2512, 106 46, 106 52, 106 54, 313118, 428432, C03C 308, C03C 502

Patent

active

040849767

ABSTRACT:
A high-silica ceramic glaze, having a low coefficient of thermal expansion, suitable for application to alumina bodies, is disclosed. The glaze comprises, by weight percent, about 50 percent SiO.sub.2, from 5 to 8 percent Al.sub.2 O.sub.3, from 6 to 12 percent B.sub.2 O.sub.3, from 2 to 15 percent BaO, from 5 to 8 percent SrO, from 4 to 6 percent CaO, from 2 to 8 percent MgO, from 1 to 2 percent ZnO, and about 5 percent total of Na.sub.2 O, K.sub.2 O, Li.sub.2 O, and minor impurities.

REFERENCES:
patent: 3790842 (1974-02-01), Westenkirchner et al.
patent: 3927238 (1975-12-01), Di Marcello
Parmelee, C. W., "Ceramic Glazes", (1951), pub. by Industrial Publications, Chicago, Ill., pp. 169, 173-176.

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