Colored, textured glass-ceramic articles
AssigneeCorning Incorporated
InventorsDavid H. Crooker, Lina M. Echeverria
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Abstract
This invention is directed to the production of glass-ceramic articles comprising an interior portion and a surface layer exhibiting a variegated color, textured surface appearance. In the most preferred embodiment lithium disilicate crystals constitute the predominant crystal phase in both the interior portion and in the surface layer.
Claims6
A glass-ceramic article wherein lithium disilicate crystals constitute the predominant crystal phase comprising an interior portion and a surface layer wherein at least a portion of said surface layer exhibits a variegated color, textured appearance resulting from the presence of a colorant therein, said interior portion and said surface layer having the same base composition consisting essentially, expressed in terms of weight percent on the oxide basis, of 8-19% Li.sub.2 O, 0-5% Na.sub.2 O, 0-7% K.sub.2 O, 0-8% Na.sub.2 O+K.sub.2 O, 0-10% CaO, 0-6% SrO, 0-6% BaO, 2-12% Na.sub.2 O+K.sub.2 O+CaO+SrO+BaO, 0-7% ZnO, 0-11% Al.sub.2 O.sub.3, 1.5-11% ZnO Al.sub.2 O.sub.3 O, with a molar ratio (Na.sub.2 O+K.sub.2 O+CaO+SrO+BaO):(ZnO+Al.sub.2 O.sub.3) between 0.075-1.25, 65-80% SiO.sub.2, and 1.5-7% P.sub.2 O.sub.5 and/or 0.0001-0.1% Pd as a nucleating agent and the same crystal phase(s).
Dependencies are inferred from the claim text.