Metal silicides as performance modifiers for glass compositions
AssigneeLibbey-Owens-Ford Co.
InventorSrikanth Varanasi
Life of this patent
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Abstract
Silicate based glass compositions with metal silicide compounds included in the composition as performance modifiers to impart desirable color and improved energy absorbance properties. The metal silicides are added to the batch glass composition in amounts greater than 0.05 weight percent prior to melting. The composition and method result in a finished glass suitable for use in architectural and automotive glazings.
Claims26
A batch glass composition comprising a soda-lime-silica glass batch mixture, at least one metal silicide as a performance modifying agent and, in addition, at least one iron-containing compound, said metal silicide being present in said glass batch mixture in an amount no greater than about 4.0 weight percent.
A batch glass composition comprising:
- a) a soda-lime-silica float glass batch mixture including from about 65 to about 80 weight percent SiO2, from about 10 to about 20 weight percent Na2O, from about 5 to about 15 weight percent CaO, from about 0 to about 10 MgO, from about 0 to about 5 weight percent Al2O3, from about 0 to about 5 weight percent K2O, from about 0 to about 5 weight percent BaO, from about 0 to about 5 weight percent B2O3, from about 0 to about 5 weight percent Ga2O3;
- b) an amount of at least one metal silicide;
- and
- c) an amount of at least one iron-containing compound separate from said metal silicide.
A finished silicate glass resulting from the admixing, heating and melting of at least one metal silicide in a silicate glass batch composition and at least one iron-containing compound which is separate from said metal silicide.
A laminated automotive glazing unit, comprising two sheets of a soda-lime-silica glass integrally adhered together, said glass including an amount of a silicide and resulting from the admixing, melting, and heating of at least one metal silicide in a batch glass composition.
A method for producing a soda-lime-silica glass comprising admixing, heating, and melting a batch glass composition comprising from about 65 to about 80 weight percent SiO2, from about 10 to about 20 weight percent Na2O, from about 5 to about 15 weight percent CaO, from about 0 to about 10 MgO, from about 0 to about 5 weight percent Al2O3, from about 0 to about 5 weight percent K2O, from about 0 to about 5 weight percent BaO, from about 0 to about 5 weight percent B2O3, from about 0 to about 5 wt % Ga2O3, an amount of one or more metal silicides and, in addition, at least one iron-containing compound, said metal silicide being present in said batch glass composition in an amount no greater than about 4.0 wt %.
A method for melting a batch glass composition and producing a silicate finished glass, characterized by admixing, heating and melting a composition comprising:
- a) a silicate float glass batch mixture;
- b) a quantity of one or more metal silicides in an amount no greater than about 4.0 wt %;
- and
- c) an amount of at least one iron-containing compound separate from said metal silicide.
Dependencies are inferred from the claim text.