Lead-free glaze for alumina bodies
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United States of America Patent
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Mar 17, 1981
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N/A
app pub date -
Feb 8, 1980
filing date -
Feb 8, 1980
priority date (Note) -
Expired
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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.
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