Transparent glass-ceramic articles

Details Transparent glass-ceramic articles Transparent glass-ceramic articles

C - Chemistry, Metallurgy

03

C

261/20

C03C 3/083 (2006.01) C03C 10/00 (2006.01)

Patent

CA 2031666

This invention is principally directed to the prepara- tion of transparent glass-ceramic articles which, when very rapidly crystallized in situ from precursor glass articles in plate form, exhibit very minimal distortion. The glass-ceramic articles contain .beta.-quartz solid solution as the predominant crystal phase and consist essentially, in weight percent, of SiO2 65-70 MgO+BaO+SrO 1.1-2.3 Al2O3 18-19.8 ZrO2 1.0-2.5 Li2O 2.5-3.8 As2O3 0-1.5 MgO 0.55-1.5 Sb2O3 0-1.5 ZnO 1.2-2.8 As2O3+Sb2O3 0.5-1.5 TiO2 1.8-3.2 Na2O 0-<1.0 BaO 0-1.4 K2O 0-<1.0 SrO 0-1.4 Na2O+K2O 0-<1.0 BaO+SrO 0.4-1.4 2.8Li2O+1.2ZnO/5.2MgO >1.8 The preferred glass-ceramics contain 0.1-1.0% V2O5.

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