Bismuth-containing lead-free glass enamels and glazes of low silica content
AssigneeFerro Corporation
InventorGordon J. Roberts
Life of this patent
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Abstract
This invention relates to a lead-free glass coating made by firing a lead-free glass composition comprising in weight percent from about 35% to about 77% of bismuth oxide, from about 10% to about 33% of boron oxide, and from about 10% to about 32% of zinc oxide at a temperature sufficient to fuse and cure the glass composition. The invention also relates to lead-free glazes and enamels that exhibit excellent acid resistance, possess low coefficients of linear or thermal expansion, and moderate maturation temperatures.
Claims15
A method of decorating a section of glass comprising coating said glass with a lead-free composition, such lead-free composition comprising a glass frit including from about 35% to about 77% by weight of bismuth oxide, form about 10% to about 33% by weight of boron oxide, and from abut 10% to about 32% by weight of zinc oxide, and firing the led-free composition at a temperature sufficient to fuse and cure the lead-free composition.
A method of decorating a section of glass comprising:
- I. providing a section of glass;
- II. providing a lead-free composition, such lead-free composition comprising a glass frit, such frit comprising in weight percent from about 35% to about 77% Bi.sub.2 O.sub.3, from about 10% to about 33% B.sub.2 O.sub.3 and from about 10% to about 32% ZnO;
- III. applying such lead-free composition to such section of glass;
- and
- IV. firing such coated section of glass.
Dependencies are inferred from the claim text.