Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1979-11-05
1981-03-17
McCarthy, Helen M.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
106 396, 106 48, 106 54, 174 685, 4273764, 427 96, 427330, 428433, 428457, 428901, 428697, 428702, B32B 300, C03C 322, C03C 502
Patent
active
042567963
ABSTRACT:
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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Allington, T. R. et al., "Characterization of Thick Film Compositions on Porcelainized Steel Substrates", E. I. Du Pont de Nemours.
Hilson, D. G. et al., "New Materials Low Cost Thick Film Circuits", EMCA, (1977).
Anderson Wayne M.
Hang Kenneth W.
McCarthy Helen M.
Morris Birgit E.
RCA Corporation
Sites Edward J.
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