Porcelain enamel having metallic appearance
AssigneeFerro Corporation
InventorLouis J. Gazo
Life of this patent
Estimating the term…
Abstract
The present invention provides a composition for use in forming a porcelain enamel coating having a metallic appearance. The composition according to the invention preferably includes a low shear blend of a glass component and metal particles such as aluminum, nickel, copper and stainless steel. The glass component includes at least one glass frit that fuses at a temperature of less than about 600° C. Upon firing at a temperature of from about 535° C. to about 600° C., the composition forms a vitreous porcelain enamel coating that has a metallic appearance, which through the incorporation of various optional pigments and/or mill additions, can range from a bright brushed nickel or stainless steel appearance to a matte dark metallic finish.
Claims20
A composition for use in forming a porcelain enamel coating having a metallic appearance, the composition comprising:
- from about 65% to about 95% by weight of a glass component comprising at least one glass frit that fuses at a temperature of less than about 600° C.;
- wherein the glass frit comprises by weight from about 25% to about 45% SiO2, from about 8% to about 30% TiO2, from about 20% to about 40% Na2O+K2O+Li2O, from about 0% to about 20% B2O3, from about 0% to about 8% Sb2O5, from about 0% to about 7% P2O5, from about 0% to about 15% V2O5, and from about 0% to about 6% BaO;
- and
- from about 0.01% to about 7% by weight of metal particles.
A composition for use in forming a porcelain enamel coating having a metallic appearance, the composition comprising:
- from about 65% to about 95% by weight of a glass component comprising at least one glass frit that fuses at a temperature of less than about 600° C.;
- wherein the glass frit comprises by weight from about 30% to about 40% SiO2, from about 11% to about 25% TiO2, from about 12% to about 24% Na2O, from about 6% to about 15% K2O, from about 5% to about 10% V2O5, from about 1% to about 6% Li2O, from about 0% to about 15% B2O3, from about 0% to about 5% Sb2O5, from about 1% to about 4% P2O5, from about 0% to about 3% MgO, from about 0% to about 2% Al2O3, and from about 0% to about 5% coloring oxides;
- and
- from about 0.01% to about 7% by weight of metal particles.
A composition for use in forming a porcelain enamel coating having a metallic appearance, the composition comprising:
- from about 65% to about 95% by weight of a glass component comprising at least one glass frit that fuses at a temperature of less than about 600° C.;
- wherein the glass frit comprises by weight about 35.9% SiO2, about 16% TiO2, about 15.2% Na2O, about 13.7% B2O3, about 9.6% K2O, about 3.9% Li2O, about 2.9% Sb2O5, about 1.6% BaO, and about 1.2% P2O5,
- and
- from about 0.01% to about 7% by weight of metal particles.
Dependencies are inferred from the claim text.