磷酸钙/氧化锆复合陶瓷的微观结构及力学性能

Microstructure and Mechanical Properties of Calcium Phosphate-zirconia Composite Ceramics

利用冷等静压成形，经不同的温度烧结制备了不同比例的磷酸钙与钇稳定四方氧化锆系列复合陶瓷，XRD、SEM及力学性能测试结果表明，随磷酸钙含量的增加，陶瓷的相对密度降低，晶粒尺寸变大，四方氧化锆（t-ZrO2）减少，单斜氧化锆（m-ZrO2）增加，导致力学性能下降；1350℃烧结合磷酸钙质量分数为12％～15％的样品及1400℃烧结合磷酸钙质量分数为15％的样品以t-ZrO2为主，并含有少量m-ZrO2和TCP（Ca3（PO4）2），其相对密度大于95％，综合力学性能评价分析表明，它可用于CAD／CAM加工口腔修复材料．

Yttria stabilized zirconia ceramics doped with different contents of calcium phosphate were prepared by treatments including ball-milling, cold isostatic pressing and sintering in air at 1 300 ℃, 1 350 ℃ and 1 400 ℃ for 2 h. XRD, SEM and measurements of some mechanical properties on the ceramics were performed. The results show that the composites with 12% to 15% calcium phosphate sintered at 1 350 % and with 15% calcium phosphate sintered at 1 400 ℃ mainly remained tetragonal zirconia （t-ZrO2 ） phase and a few monoelinic zirconia （m-ZrO2 ） phase and TCP. The relative densities exceed 95% of the theoretical values. Thus these materials are hopeful of potential application as machinable ceramics in CAD/CAM.