	US 12,227,444 B2
	Coloured transparent lithium aluminium silicate glass-ceramic and use thereof
Evelin Weiss, Mainz (DE); Martin Spier, Horrweiler (DE); Matthias Bockmeyer, Mainz (DE); Thomas Zenker, Nieder-Olm (DE); Klaus Schönberger, Mainz (DE); Johannes Stinner, Mainz (DE); Oliver Hochrein, Mainz (DE); Uwe Martens, Mainz-Kastel (DE); and Michael Bug, Mühltal (DE)
Assigned to SCHOTT AG, Mainz (DE)
Filed by SCHOTT AG, Mainz (DE)
Filed on Aug. 21, 2018, as Appl. No. 16/105,997.
Claims priority of application No. 10 2017 119 914.4 (DE), filed on Aug. 30, 2017; and application No. 10 2018 101 423.6 (DE), filed on Jan. 23, 2018.
Prior Publication US 2019/0062201 A1, Feb. 28, 2019
Int. Cl. C03C 10/00 (2006.01); C03C 3/087 (2006.01); C03C 3/097 (2006.01); C03C 4/02 (2006.01); F24C 15/10 (2006.01)

CPC C03C 10/0027 (2013.01) [C03C 3/087 (2013.01); C03C 3/097 (2013.01); C03C 4/02 (2013.01); C03C 10/0054 (2013.01); F24C 15/10 (2013.01); C03C 2204/00 (2013.01)]

14 Claims

1. Coloured, transparent, lithium aluminium silicate glass-ceramic, characterized by

an As₂O₃and/or Sb₂O₃content of in total 0 to <1000 ppm,

a V₂O₅content of 100 ppm to 200 ppm,

an Fe₂O₃content of 700 ppm to 1000 ppm, and

a ratio of Fe₂O₃/V₂O₅(both in wt %) of 3-9,

wherein the lithium aluminium silicate glass-ceramic includes alkali earth metal oxides and is free from CoO, NiO and Cr₂O₃, and

wherein the lithium aluminosilicate glass-ceramic has the following transmission qualities when the lithium aluminosilicate glass-ceramic is measured at a 4 mm thickness after polishing with a standard illuminant D65 and an observer angle of 2°:

Y(D65, 2°) 2.5−10%,

τ (at 465 nm)>1.0%, and

a difference (Y(D65, 2°)−τ (at 465 nm)) of ≤3%.