Transparent glass-ceramics containing mullite

Details Transparent glass-ceramics containing mullite Transparent glass-ceramics containing mullite

1982-07-06

1983-08-02

Bell, Mark

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 64, 501 66, 501 77, 501 78, C03C 322, C03C 304

Patent

active

043967205

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 1070% 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 015% 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: 3540895 (1970-11-01), Scheidler et al.
patent: 3681102 (1972-08-01), Beall
patent: 3841856 (1974-10-01), Bondarev et al.
patent: 3881945 (1975-05-01), Trojer et al.
patent: 4285728 (1981-08-01), Babcock

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