Corning Incorporated

Corning Glass Works

Charles C Smith, Jr

Robert W Pfitzenmaier

Bruce Gardiner Aitken

Thomas H Elmer

Arthur E Hillman

Sandra L Hagg

Robert G Howell

Herbert E Rauscher

Karl E Hoekstra

A colored glass-ceramic and method of making it. The glass-ceramic has a primary crystal phase selected from the group consisting of beta-quartz solid solution and beta-spodumene solid solution, containing an amount of TiO.sub.2 effective as a nucleating agent up to 6% by weight, 700-900 ppm Fe.sub.2 O.sub.3 and 550-3000 ppm Co.sub.3 O.sub.4, the glass-ceramic having a beta-quartz solid solution as a primary crystal phase being transparent and having a color defined by the color coordinates x=0.2200-0.3100, y=0.0200-0.2400 falling within color box ABCDA in FIG. 1 in the drawings, and the glass-ceramic having a beta-spodumene solid solution as a primary crystal phase being opaque and having a color defined by the color coordinates x=0.2480-0.2880, y=0.2000-0.3150 falling within color box JKLMJ in FIG. 2 in the drawings. Reddish-purple and violet colors are obtained in transparent, beta-quartz glass-ceramics, while light to dark blue colors are obtained in opaque, beta-spodumene glass-ceramics.

Colored glass-ceramics and method

A colored, transparent glass-ceramic having a beta-quartz solid solution as its primary crystal phase, and a method of producing 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 an amount of TiO.sub.2 effective as a nucleating agent up to about 6%, and having a color package composed of 10-20 ppm Co.sub.3 O.sub.4, 550-650 ppm Fe.sub.2 O.sub.3, 19.5-20.5% Al.sub.2 O.sub.3 and 2.5-3.0% Li.sub.2 O.

Glass-ceramics and color package

A transparent glass-ceramic and an article of cookware formed therefrom. The glass-ceramic has as its primary crystal phase a beta-quartz solid solution, contains an amount of TiO.sub.2 effective as a nucleating agent up to about 6%, and has a color package composed of 50 to 150 ppm Co.sub.3 O.sub.4, 50 to 250 ppm NiO and 400 to 1000 ppm Fe.sub.2 O.sub.3 that provides a burgundy color.

Colored glass-ceramic

The instant invention relates to the production of composite glass articles involving the bringing together of two or more glasses, while in the molten state, into an integral unit. More particularly, the present invention is concerned with the manufacture of such articles wherein a reaction occurs at the interface between the laminae of molten glass such that an opal phase is spontaneously produced in situ thereat.

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Corning, NY, United States of America

Charles C Smith, Jr