Glass with high proportion of zirconium-oxide and its uses

Details Glass with high proportion of zirconium-oxide and its uses Glass with high proportion of zirconium-oxide and its uses

C - Chemistry, Metallurgy

03

C

C03C 3/087 (2006.01) C03C 3/095 (2006.01) C03C 13/00 (2006.01)

Patent

CA 2360850

The invention relates to a glass containing a high proportion of zirconium oxide, with the following composition (based on the weight percent of oxide): SiO2 54-72; Al2O3 0.5-7; ZrO2 8-20; B2O3 0-~5; Na2O 3-~8; K2O 0-5; with Na2O + K2O 2-~8; CaO 3-11; MgO 0-10; SrO 0-8; BaO 0-10; with CaO+MgO+SrO+BaO~5-24; La2O3 0-5; TiO2 0-4. The glass displays a high degree of chemical stability.

L'invention concerne un verre à haute teneur en oxyde de zirconium comportant les composants suivants (en pour-cent en poids, sur la base de l'oxyde): SiO¿2? = 54 - 72; Al¿2?O¿3? = 0,5 - 7; ZrO¿2? = 8 - 20; B¿2?O¿3? = 0 - < 5; Na¿2?O = 3 - < 8; K¿2?O = 0 - 5; Na¿2?O + K¿2?O représentant 2 - < 8; CaO = 3 - 11; MgO = 0 - 10; SrO = 0 - 8; BaO = 0 - 10; CaO + MgO + SrO + BaO étant > 5 - 24; La¿2?O¿3? = 0 - 5; TiO¿2? = 0 - 4. Ce verre présente une grande résistance chimique.

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