Transparent glass-ceramics based on alpha- and beta-willemite

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 10/04 (2006.01) C03B 32/02 (2006.01) C03C 10/00 (2006.01) C09K 11/08 (2006.01) C09K 11/59 (2006.01) C09K 11/64 (2006.01) C09K 11/68 (2006.01)

Patent

CA 2387951

A glass-ceramic which is substantially and desirably totally transparent, and which contains a willemite predominant crystal phase within the ternary Mg2SiO4-Zn2SiO4-Li4SiO4 system. The glass-ceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide basis, of 25-60 SiO2, 4-20 Al2O3, 20-55 ZnO, 0-12 MgO, 0-18 K2O, 0-12 Na2O, 0- 30 GeO2, with the condition that .SIGMA. K2O+ Na2O >= 5. The glass-ceramic may be doped with up to 1 wt. % Cr2O3 to impart optical activity thereto.

L'invention concerne un vitrocéramique qui est pratiquement et de préférence complètement transparent et qui contient une phase cristalline prédominante de willémite à l'intérieur du système ternaire Mg¿2?SiO¿4?-Zn¿2?SiO¿4?-Li¿4?SiO¿4?. Le vitrocéramique est constitué de verres précurseurs possédant les compositions suivantes, dans un pourcentage pondéral sur une base d'oxyde, de 25-60 SiO¿2?, 4-20 Al¿2?O¿3?, 20-55 ZnO, 0-12 MgO, 0-18 K¿2?O, 0-12 Na¿2?O, 0-30 GeO¿2?, à condition que .SIGMA. K¿2?O+ Na¿2?O >= 5. Le vitrocéramique peut être dopé avec jusqu'à 1 pour-cent en poids de Cr¿2?O¿3? pour avoir une activité optique.

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