C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
261/19
C03C 10/04 (2006.01) C03C 10/00 (2006.01)
Patent
CA 1196032
Abstract of the Disclosure This invention is concerned with the production of stantially transparent glass-ceramic articles containing mullite as the predominant crystal phase which can be prepared by crystallizing in situ precursor glasses capable of being melted at temperatures no higher than 1650°C. The inventive articles consist essentially, in weight percent, of 1070% SiO2, 7-40% B2O3, 14-50% Al2O3, 0-35% RO, wherein RO consists of at least one member of the group in the indicated proportions of 015% MgO, 1-20% CaO, 0-30% SrO, 0-30% BaO, and 0-30% PbO, and 0-30% R2O, wherein R2O consists of at least one member of the group in the indicated proportions of 0-10% Li2O, 0- 15% Na2O, 0-25% K2O, 0-25% Rb2O, and 0-25% Cs2O, the mole ratio Al2O3:RO+R2O>1.3. Where 0.01-1% Cr2O3 is included in the composition, the glass-ceramic will exhibit broad absorption over the visible region of the radiation spectrum, strong fluorescence in the red and near infrared portions of the spectrum where exposed to ultraviolet and/or visible radiation, and relatively little overlap of the absorption and fluorescent spectra.
429471
Beall George H.
Macdowell John F.
Taylor Mark P.
Corning Glass Works
Gowling Lafleur Henderson Llp
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