Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass
Patent
1990-10-29
1991-11-12
Bell, Mark L.
Glass manufacturing
Processes
Devitrifying glass or vitrifying crystalline glass
501 3, 501 4, C03C 1000, C03C 1014, C03C 1016
Patent
active
050644602
ABSTRACT:
This invention is directed to the formation of blue-to-black transparent glass-ceramic articles containing .beta.-quartz solid solution as essentially the sole crystal phase present therein. The articles are prepared by heat treating reduced precursor glass articles consisting essentially, in weight percent, of 2.5-5% Li.sub.2 O, 1-2% MgO, 18-30% Al.sub.2 O.sub.3, 2-4% TiO.sub.2, 1-4% ZrO.sub.2, 48-70% SiO.sub.2, 1-12% P.sub.2 O.sub.5, and 0-2% ZnO. The precursor glass articles are placed in a reduced state through the inclusion of a sufficient amount of a hydrogen-containing phosphate and/or chloride and/or Ti.sub.2 O.sub.3 to obtain about 0.2-6% of the total titanium content in the form of Ti.sup.+3 ions.
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.
Bell Mark L.
Corning Incorporated
Janes, Jr. C. S.
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