Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass
Patent
1999-01-12
2000-08-22
Silverman, Stanley S.
Glass manufacturing
Processes
Devitrifying glass or vitrifying crystalline glass
65 331, 501 14, 501 16, 501 17, 501 20, 501 21, 501 32, C03C 824, C03C 1704, C03C 1000
Patent
active
061053945
ABSTRACT:
The present invention provides lead and cadmium free glass enamel compositions. In one embodiment of the invention, glass frits include from about 0.1 percent by weight to about 15 percent by weight Nb.sub.2 O.sub.5, less than about 3 percent by weight alkali metal oxides, less than about 3 percent by weight ZnO, less than about 1 percent by weight B.sub.2 O.sub.3, and precursors from which Bi.sub.2 SiO.sub.5 can be crystallized upon firing, said precursors including Bi.sub.2 O.sub.3 and SiO.sub.2. Glass frits according to the present invention preferably further include up to about 25 percent by weight of coloring oxides, such as CeO.sub.2, Co.sub.3 O.sub.4, In.sub.2 O.sub.3, SnO, Cr.sub.2 O.sub.3, CuO, Fe.sub.2 O.sub.3, MnO.sub.2, MoO.sub.3, NiO, and V.sub.2 O.sub.5. By incorporating various amounts of coloring oxides into the compositions, the degree of crystallization and the rate at which crystallization occurs upon firing of the compositions can be controlled. Compositions according to the present invention form enamels upon firing which exhibit excellent resistance to acids, water, and alkalis as compared to enamels formed from prior art lead and cadmium free glass enamel compositions.
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Blonski Robert P.
Emlemdi Hasan B.
Joyce Ivan H.
Roberts Gordon J.
Sridharan Srinivasan
Ferro Corporation
Ruller Jacqueline A.
Silverman Stanley S.
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