Borosilicate glass frit with MgO and BaO
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United States of America Patent
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Oct 19, 1982
Issued Date -
N/A
app pub date -
Oct 3, 1980
filing date -
Nov 5, 1979
priority date (Note) -
Expired
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Abstract
Borosilicate glass frit with MgO as a major component for forming partially devitrified porcelain compositions are provided which are comprised of a mixture, based on its oxide content, of barium oxide (BaO), magnesium oxide (McO) or a mixture of magnesium oxide with certain other oxides, boron trioxide (B.sub.2 O.sub.3) and silicon dioxide (SiO.sub.2). In accordance with this invention the porcelain compositions are applied to the metal core and fired to provide a partially devitrified porcelain coating on the metal core. The coating has a very low viscosity at its initial fusion point and then almost instantaneous high viscosity due to partial devitrification. The fired coating has a deformation temperature of at least 700.degree. C. and a high coefficient of thermal expansion of at least about 110.times.10.sup.-7 /.degree.C.
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