Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass
Patent
1983-03-28
1985-05-28
Schor, Kenneth M.
Glass manufacturing
Processes
Devitrifying glass or vitrifying crystalline glass
501 5, C03C 322
Patent
active
045198284
ABSTRACT:
This invention is concerned with the production of substantially 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.degree. C. The inventive articles consist essentially, in weight percent, of 10-70% SiO.sub.2, 7-40% B.sub.2 O.sub.3, 14-50% Al.sub.2 O.sub.3, 0-35% RO, wherein RO consists of at least one member of the group in the indicated proportions of 0-15% MgO, 0-20% CaO, 0-30% SrO, 0-30% BaO, and 0-30% PbO, and 0-30% R.sub.2 O, wherein R.sub.2 O consists of at least one member of the group in the indicated proportions of 0-10% Li.sub.2 O, 0-15% Na.sub.2 O, 0-25% K.sub.2 O, 0-25% Rb.sub.2 O, and 0-25% Cs.sub.2 O, the mole ratio Al.sub.2 O.sub.3 :RO+R.sub.2 O>1.3. Where 0.01-1% Cr.sub.2 O.sub.3 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.
REFERENCES:
patent: 3146114 (1964-08-01), Kivlighn
patent: 3540895 (1970-11-01), Scheidler et al.
patent: 3681102 (1972-08-01), Beall
patent: 3881945 (1975-05-01), Trojer et al.
patent: 3905824 (1975-09-01), Grossman
patent: 4285728 (1981-08-01), Babcock et al.
Beall George H.
MacDowell John F.
Taylor Mark P.
Corning Glass Works
Janes, Jr. C. S.
Schor Kenneth M.
LandOfFree
Transparent glass-ceramics containing mullite does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transparent glass-ceramics containing mullite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transparent glass-ceramics containing mullite will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-866956