| 摘要 |
For dental prostheses of low-melting gold alloys and titanium alloys, ceramic masses having processing temperatures of about 770 DEG C and coefficients of thermal expansion of 8-9 x 10<-6> K<-1> and 16-17.5 x 10<-6> K<-1> are required for blending. Such ceramic masses are composed of: SiO2, 4 to 15% by weight of Al2O3, 0.7 to 2.5% by weight of B2O3, 0 to 0.9% by weight of Sb2O3, 0 to 0.5% by weight of CeO2, 0 to 2.5% by weight of BaO, 0 to 0.5% by weight of CaO, 7 to 12% by weight of K2O, 6 to 11% by weight of Na2O, 0.55 to 1.4% by weight of Li2O and 0.2 to 1.0% by weight of F2. |
