Borosilicate glass frit with MgO and BaO

Details Borosilicate glass frit with MgO and BaO Borosilicate glass frit with MgO and BaO

1980-10-03

1982-10-19

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 26, 501 77, 501 79, C03C 310

Patent

active

043551157

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.

REFERENCES:
patent: 3022179 (1962-02-01), Morrissey
patent: 3225132 (1965-12-01), Baas et al.
patent: 3413133 (1968-11-01), Stalego
patent: 3912525 (1975-10-01), Monneraye et al.
patent: 4256796 (1981-03-01), Hang et al.

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