Transparent colored glass ceramic with good thermal stability an

Details Transparent colored glass ceramic with good thermal stability an Transparent colored glass ceramic with good thermal stability an

1986-10-24

1993-05-18

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 64, 501 70, 501 71, C03C 3085

Patent

active

052121224

ABSTRACT:
A transparent, colored glass ceramic containing high-quartz solid solution crystals, whose transmission in the IR range between 800 nm and 2.6 microns can be variably adjusted, and which has the composition (in weight percent) of 62-68% SiO.sub.2, 19.5-22.5% Al.sub.2 O.sub.3, 3.0-4.0 Li.sub.2 O, 1.5-3.5% BaO, 0.5-2.5% ZnO and 1.5-5.0% TiO.sub.2 in addition to other possible oxides, which are present in small quantities, the color being produced by MnO.sub.2, Fe.sub.2 O.sub.3, CoO, NiO, V.sub.2 O.sub.5 and Cr.sub.2 O.sub.3.
This glass ceramic is transformed from the starting glass by a heat treatment between 680.degree. C. and 920.degree. C.

REFERENCES:
patent: 3788865 (1965-06-01), Babcock et al.
patent: 4009042 (1977-02-01), Rittler
patent: 4192688 (1980-03-01), Babcock et al.
patent: 4285728 (1981-08-01), Babcock et al.
patent: 4461839 (1984-07-01), Rittler

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