Phosphosilicate glass ceramic

摘要

Phosphosilicate glass ceramic comprises: many fluoroapatite crystals; many leucite crystals; and components comprising: silicon dioxide (57.6-62 wt.%); aluminum oxide (12-16 wt.%); boron oxide (0.0-1.5 wt.%); potassium oxide (9-13 wt.%); sodium oxide (5-8 wt.%); lithium oxide (0.0-1.5 wt.%); barium oxide (0-0.5 wt.%); calcium oxide (0.6-2.4 wt.%); zinc oxide (0-3 wt.%); titanium dioxide (0-1.5 wt.%); zirconium oxide (0-3.5 wt.%); cerium oxide (0-1 wt.%); phosphorus pentoxide (0.4-2.5 wt.%); and fluorine (0.3-1.5 wt.%). Independent claims are included for: (1) a preparation of the phosphosilicate glass ceramic comprising: melting a glass comprising the components at a temperature of 1500-1550[deg] C, pouring the glass melt obtained into water to form a glass granulate, optionally comminuting the glass granulate to a glass powder with an average particle size of less than 90 mu m, preferably 10-40 mu m, and subjecting the glass granulate or the glass powder to a heat treatment in a temperature of 500-1000[deg] C, for a period of 30 minutes to 6 hours to form the glass ceramic; (2) a dental material shaped from the phosphosilicate glass ceramic; and (3) a dental product shaped from the phosphosilicate glass ceramic.