Porcelain enamel composition and substrates coated therewith
AssigneeMobay Corporation
InventorRobert L. Hyde
Life of this patent
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Abstract
A partially devitrified porcelain enamel composition is formed by melting an oxide mixture in which 20-50 wt % BaO, 30-60 wt % SiO.sub.2, and 2-20 wt % TiO.sub.2 are present to form a homogeneous melt, quenching the melt to form a frit and firing the frit. The oxide mixture may optionally include K.sub.2 O, Na.sub.2 O, Li.sub.2 O, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, As.sub.2 O.sub.3, CaO, CeO.sub.2, MgO, F.sub.2, N.sub.2 O.sub.5, PbO, P.sub.2 O.sub.5, Sb.sub.2 O.sub.3, SnO.sub.2, SrO, ZnO, ZrO.sub.2, and MoO.sub.3. Metal substrates coated with such a partially devitrified porcelain enamel composition are particularly suitable for the production of electronic circuits.
Claims10
A partially devitrified porcelain enamel composition formed by melting a mixture of materials which upon melting form an oxide mixture consisting essentially of:
- (a) 20-50 wt % BaO
- (b) 30-60 wt % SiO.sub.2
- (c) 2-20 wt % TiO.sub.2
- (d) 0-16 wt % K.sub.2 O
- (e) 0-4 wt % Na.sub.2 O
- (f) 0-4 wt % Li.sub.2 O
- (g) 0-10 wt % Al.sub.2 O.sub.3
- (h) 0-3 wt % B.sub.2 O.sub.3
- (i) 0-3 wt % As.sub.2 O.sub.3
- (j) 0-10 wt % CaO
- (k) 0-3 wt % CeO.sub.2
- (l) 0-10 wt % MgO
- (m) 0-3 wt % F.sub.2
- (n) 0-3 wt % N.sub.2 O.sub.5
- (o) 0-3 wt % PbO
- (p) 0-3 wt % P.sub.2 O.sub.5
- (q) 0-3 wt % Sb.sub.2 O.sub.3
- (r) 0-3 wt % SnO.sub.2
- (s) 0-10 wt % SrO
- (t) 0-7 wt % ZnO
- (u) 0-10 wt % ZrO.sub.2 and
- (v) 0-3 wt % MoO.sub.3
- with the total weight percent being approximately 100 wt % to form a homogeneous melt, quenching the melt to form a frit and firing the frit.
Dependencies are inferred from the claim text.