Blue/gray transparent glass-ceramic articles

Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass

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501 3, 501 4, C03C 1000, C03C 1014, C03C 1016

Patent

active

050644610

ABSTRACT:
This invention is directed to the production of transparent glass-ceramic articles demonstrating linear coefficients of thermal expansion of less than 10.times.10.sup.-7 /.degree.C. and exhibiting a blue or gray coloration. The articles are prepared by heat treating reducing precursor glass articles consisting essentially, in weight percent as calculated from the batch, of 2.5-3.5% Li.sub.2 O, 1.5-2.5% MgO, 17.75-20% Al.sub.2 O.sub.3, 64-70% SiO.sub.2, 2-4.5% TiO.sub.2, 1-2% ZrO.sub.2, 0-2% BaO, and 0.2-0.5% Cl, wherein alkali metals other than Li.sub.2 O, alkaline earth oxides other than MgO and BaO, ZnO, and B.sub.2 O.sub.3 are essentially absent therefrom.

REFERENCES:
patent: 3642504 (1972-02-01), Petzold et al.
patent: 4009042 (1977-02-01), Rittler
patent: 4018612 (1977-04-01), Chyung
patent: 4084974 (1978-04-01), Beall et al.
patent: 4192688 (1980-03-01), Babcock et al.

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