2种纳米粉体对牙科ZrO2陶瓷掺杂增强效果的比较

目的观察不同纳米粉体填充到微米尺度的ZrO2造粒粉中对陶瓷ZrO2纳米复合材料性能的影响。方法利用超声波．共沉淀法制备纳米α-Al2O3粉体；利用反向沉淀法制备氧化钇稳定的纳米锆粉体；作为第二相，以不同的量（体积百分比，vol％）填充到基质微米ZrO2造粒粉中，高温煅烧后，测试了纳米粉体掺杂ZrO2陶瓷复合材料的弯曲强度、断裂韧性和维氏硬度等力学性能。结果纳米α—Al2O3的最佳填充量为5vol％，此时ZrO2复相陶瓷的弯曲强度和断裂韧性分别为（659．17±46．54）MPa和（8．55±0．89）MPam^1/2；纳米ZrO2的最佳填充量为10vol％，此时ZrO2复相陶瓷的弯曲强度和断裂韧性分别为（673．17±47．19）MPa和（9．01±0．82）MPam^1/2。结论当填充纳米ZrO2和纳米α-Al2O3的量〉5vol％（如10vol％）时．前者增强效果优于后者；但当填充量≤5vol％时，后者的增强效果优于前者。

Comparison of the enhancement effect of two different nanopowders doping on dental ZrO2 ceramics

Objective To observe the influences of doping different nanopowders into ZrO2 micrometer granulated powder on the properties of ZrO2 nanocomposite ceramic. Methods The α -Al2O3 nanopowders were prepared by the ultrasonic-assisted precipitation method, and the Y2O3 stabilized ZrO2 nanopowders were prepared by the reverse-precipitation method. The different amounts （vol %） of the α -Al2O3 or ZrO2 nanopowders were added to the micrometer-sized ZrO2 matrix, and then sintered at a high temperature. Further, the nanopowders doped ZrO2 ceramic were characterized by the mechanical properties including flexural strength, fracture toughness and Vickers-hardness. Results There was an optimum amount of doped α -Al2O3 or ZrO2 nanopowders. In the case of α -Al2O3 nanopowder, 5 vol % was the optimum amount. When doped with 5 vol %α -Al2O3 nanopowder, the flexural strength of ZrO2 nanocomposite ceramic was （659.17±46.54） MPa and the fracture toughness was （8.55 ±0.89） MPam^1/2, respectively. In the case of ZrO2 nanopowder, 10 vol % was the optimum amount. When doped with 10 vol% Zr02 nanopowder, the flexural strength of ZrO2 nanocomposite ceramic was （673.17±47.19） MPa and the fracture toughness was （9.0±0.82） MPam^1/2, respectively. When the doped amount was less or equal to 5 vol%, the enhancement effect of α -Al2O3 nanopowder doping was better than that of ZrO2 nanopowders doping. Conelusion When the doped amount of ZrO2 nanopowder or α -Al2O3 nanopowder was greater than 5 vol%, the enhancement effect of the former was better than that of the latter. However, when the doped amount of ZrO2 or α -Al2O3 nanopowder was less than or equal to 5 vol%, the enhancement effect of the latter was better than that of the former.