玻璃渗透氧化锆全陶瓷牙科材料的制备和表征

Preparation and Characterization of Melt-infiltrated Zirconia-Glass All-ceramic Dental Composite

开发了一种适合渗透多孔四方相氧化锆的玻璃,并通过玻璃渗透工艺制备了氧化锆-玻璃全陶瓷牙科材料.研究表明,该渗透玻璃在渗透温度下(1100～1200℃)具有合适的粘度、良好的渗透性和化学相容性,且热膨胀系数与氧化锆匹配;熔融态玻璃通过毛细管作用力填充预烧后的多孔四方相氧化锆坯体的孔隙,形成氧化锆和玻璃相互交融的致密的三维网络结构,渗透过程中没有发生氧化锆从四方相到单斜相的转变.该氧化锆-玻璃复合材料的弯曲强度和断裂韧性分别为400MPa和5.5MPa-m1/2,较氧化玻璃复合材料分别提高了32%和41%.

A glass material, based on the SiO2-B2O3-La2O3-Al2O3-Y2O3-ZrO2-CaO-BaO-TiO2 system, was successfully developed for fabricating zirconia （3Y-TZP）-glass composite through melt-infiltration process for all-ceramic dental applications. The newly developed glass meets all the design criteria for 3Y-TZP infiltration, e.g. the viscosity of the glass is low enough for spontaneous infiltration at 1100-1200℃, the glass has a coefficient of thermal expansion close to that of 3Y-TZP, the glass is chemically compatible with 3Y-TZP, etc. Consequently, zirconia-glass composite was fabricated through infiltrating the glass into 3Y-TZP performs partially sintered at 1450℃ for 2 h. Preliminary research results demonstrated that the bending strength and fracture toughness of the zirconia-glass composite were 400 MPa and 5.5 MPa·m^1/2 respectively, which are respectively 32% and 41% higher as compared with the In-Ceram alumina-glass composite, tested under the same conditions.