Patent ID: 9650286
Date: 2017-05-16
CPC Classifications: C03B,C03C

Claim:
1. A glass-ceramic of the lithium aluminosilicate type, containing a beta-quartz solid solution as the predominant crystalline phase and having for a thickness of 4 mm: an integrated optical transmission, T an optical transmission at 625 nm of more than 3.5% an optical transmission at 950 nm between 50 and 70%, and an optical transmission at 1,600 nm between 65 and 75%, wherein the optical transmissions are measured after a ceramming that comprises (in sequence): (a) heating to 650° C., (b) heating from 650° C. to 820° C. at a heating rate of 5° C./min, (c) heating from 820° C. to T wherein the composition of the glass-ceramic, expressed as percentages by weight of oxides, contains: SnO V Cr Fe As wherein the composition further comprises as base oxides expressed as percentages by weight of oxides: and further wherein the composition contains less than 200 ppm of CoO.