Partially devitrified porcelain containing BaO.2MgO.2SiO.sub.2 a

Details Partially devitrified porcelain containing BaO.2MgO.2SiO.sub.2 a Partially devitrified porcelain containing BaO.2MgO.2SiO.sub.2 a

1981-03-11

1982-10-19

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 10, 501 77, 501 79, C03C 322, C03C 310

Patent

active

043551149

ABSTRACT:
Partially devitrified porcelain compositions are provided which are comprised of a mixture, based on its oxide content, of barium oxide (BaO), magnesium oxide (MgO) or a mixture of magnesium oxide with certain other oxides (CaO,ZnO), boron trioxide (B.sub.2 O.sub.3) and slicon 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: 3899340 (1975-08-01), Malmendier
patent: 3912525 (1975-10-01), Monneraye et al.
patent: 4256796 (1981-03-01), Hang et al.

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