Lead-free glaze for alumina bodies

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

1977-12-01

1978-10-17

McCarthy, Helen

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 54, C03C 502

Patent

active

041207335

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 48 to 54 percent SiO.sub.2, from 7 to 11 percent Al.sub.2 O.sub.3, from 161/2 to 20 percent B.sub.2 O.sub.3, from 11 to 14 percent BaO, from 2 to 3 percent CaO, from 2 to 21/2 percent ZnO, from 41/4 to 51/4 percent Na.sub.2 O, and from 0.4 to 1 percent K.sub.2 O. Li.sub.2 O and MgO to the extent of up to about 1/4 percent and 1 percent, respectively, can also be tolerated, as can minor amounts of other impurities.

REFERENCES:
patent: 3640738 (1972-02-01), Detweiler
patent: 3927238 (1975-12-01), DiMarcello
Parmelee, C. W. - Ceramic Glazes (1951) Pub. by Industrial Publications, Inc., Chicago, pp. 215-216, 220.
Fedrowitz, W. et al. - "Glasses for Indium Oxide Resistors" - IBM Technical Disclosure Bulletin 9(11) Apr. 1967, pp. 106-154.

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