Lithium disilicate-containing glass-ceramics some of which are self-glazing
AssigneeCorning Incorporated
InventorsGeorge H. Beall, Lina M. Echeverria, Joseph W. Morrissey, Joseph E. Pierson
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Abstract
This invention relates to glass-ceramic articles containing lithium disilicate crystals as the predominant crystal phase and consisting essentially, in weight percent, 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, with a molar ratio (Na.sub.2 O+K.sub.2 O) (ZnO+Al.sub.2 O.sub.3) between 0.075-1.25, 65-80% SiO.sub.2, and as a nucleating agent 1.5-7% P.sub.2 O.sub.5 and/or 0.0001-0.1% Pd. Glass-ceramics having certain compositions within those ranges are self-glazing.
Claims7
A glass-ceramic article containing Li.sub.2 O.multidot.2SiO.sub.2 as the predominant crystal phase 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, with a molar ratio (Na.sub.2 O+K.sub.2 O+CaO+SrO+BaO):(Al.sub.2 O.sub.3 +ZnO) between 0.075-1.25, 65-80% SiO.sub.2, and as a nucleating agent 1.5-7% P.sub.2 O.sub.5 and/or 0.0001-0.1% Pd.
A self-glazed glass-ceramic article containing Li.sub.2 O.multidot.2SiO.sub.2 as the predominant crystal phase consisting essentially, expressed in terms of weight percent on the oxide basis, of 9-18% Li.sub.2 O, 2-10% total of at least one member of the group consisting of 0-7% K.sub.2 O, 0-8% CaO, 0-6% SrO, and 0-6% BaO, 0-7% ZnO, 0-10% Al.sub.2 O.sub.3, 1.5-10% Al.sub.2 O.sub.3 +ZnO, with a molar ratio (K.sub.2 O+CaO+SrO+BaO):(Al.sub.2 O.sub.3 +ZnO) between 0.1-0.8, 65-77% SiO.sub.2, and as a nucleating agent 2-6% P.sub.2 O.sub.5.
Dependencies are inferred from the claim text.