Colored, opaque glass-ceramic
AssigneeCorning Incorporated
InventorsGeorge H. Beall, Lina M. Echeverria, Robert W. Pfitzenmaier
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Abstract
An opaque glass-ceramic having a beta-spodumene solid solution as its primary crystal phase, and a method of controlling color in the glass-ceramic. The glass-ceramic is produced from a Li.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 precursor glass containing 3-6% TiO.sub.2 +ZrO.sub.2 as a nucleating agent and having colorants controlled at levels of 1500-4,000 ppm Fe.sub.2 O.sub.3, 1500-4000 ppm CeO.sub.2 and 50-500 ppm V.sub.2 O.sub.5.
Claims8
An opaque, Li.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 glass-ceramic having a soft beige color, having beta-spodumene as its primary crystal phase, having a color package comprising, CeO.sub.2 1500-4000 ppm, Fe.sub.2 O.sub.3 1500-4000 ppm, V.sub.2 O.sub.5 50-500 ppm, having a color defined by color coordinate ranges, based on the CIE system (Illuminant C), of x=0.3200-0.3330, y=0.3265-0.3380 and Y=40-70.
A method of controlling color in a glass-ceramic material having beta-spodumene solid solution as its predominant crystal phase, the method comprising adding a color package composed of CeO.sub.2 between 1500 ppm and 4000 ppm, Fe.sub.2 O.sub.3 between 1500 and 4000 ppm, V.sub.2 O.sub.5 between 50-500 ppm and Co.sub.3 O.sub.4 not over about 20 ppm to a precursor glass, and forming said glass-ceramic material.
Dependencies are inferred from the claim text.