Verfahren zur Herstellung von geformten transluzenten Lithiumdisilikat-Glaskeramik-Produkten

• Main Authors: HOELAND, WOLFRAM, DR., SCHAAN, LI, SCHWEIGER, MARCEL, CHUR, CH, RHEINBERGER, VOLKER., VADUZ, LI, CRAMER VON CLAUSBRUCH, SASCHA, RANKWEIL, AT
• Format: Patent
• Language: German
• Published: 17.06.1999
• Edition: 6
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; HUMAN NECESSITIES; HYGIENE; JOINING GLASS TO GLASS OR OTHER MATERIALS; MEDICAL OR VETERINARY SCIENCE; METALLURGY; MINERAL OR SLAG WOOL; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

Molded translucent lithium disilicate glass ceramic products of high chemical stability and high strength are produced from a melt of specified starting glass composition. Production of molded translucent lithium disilicate glass ceramic products of high chemical stability and high strength comprises: (a) forming a melt of a starting glass composition containing (in wt.%): 57.0-80.0 SiO2, 0-5.0 Al2O3, 0.1-6.0 La2O3, 0-5.0 MgO, 0-8.0 ZnO, 11.0-19.0 Li2O, 0.1-7.0 Al2O3 + La2O3, 0.1-9.0 MgO + ZnO; (b) molding the melt and cooling; and (c) heat treating the molded glass product at 400-1100o C to form the glass ceramic product.