Alkali-zinc-silicate glass-ceramics and glasses

Details Alkali-zinc-silicate glass-ceramics and glasses Alkali-zinc-silicate glass-ceramics and glasses

C - Chemistry, Metallurgy

03

C

C03C 10/00 (2006.01) A61K 6/02 (2006.01) A61K 6/06 (2006.01) C03C 3/085 (2006.01)

Patent

CA 2154990

Alkali-zinc-silicate glass ceramics and glasses are described which have a linear thermal expansion coefficient in the range from 8.0 to 18.7 x 10-6K-1, an excellent chemical resistance and other advantageous optical properties and can be used in particular as dental material. The glass ceramic or glass contains the following components in terms of weight percentage: Component % by wt. SiO2 52.0 to 63.5 Me(III)2O3 8.5 to 13.0 K2O 0 to 20.5 Na2O 1.5 to 20.0 Li2O 0 to 5.0 ZnO 2.0 to 8.0 Me(II)O 2.5 to 6.5 TiO2 + ZrO2 0.5 to 6.0 SnO2 0 to 9.5 P2O5 0 to 4.0 F 0 to 2.0 CeO2 0 to 3.0 where a) the quantity of Me(III)2O3 given is formed from 0 to 13 % by wt. A12O3 and 0 to 9.5 % by wt. La2O3; and b) the quantity of Me(II)O given is formed from 0 to 3.5 % by wt. CaO, 0 to 4.5 % by wt. BaO and 0 to 5.0 % by wt. Mgo.

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