基于注浆成型技术采用两次烧结法(预烧结-加工-最终烧结)制备3 Y-TZP (3％(摩尔分数) Y2 O3稳定ZrO2)齿科陶瓷材料,研究了预烧结温度对其收缩率、维氏硬度、断裂韧性和磨损量的影响,结合脆性指数和磨损量对其可加工性进行评价,并表征了最终烧结后3 Y-TZP 微观形貌和力学性能.结果表明,随着预烧结温度的提高,3 Y-TZP 的收缩率、维氏硬度和断裂韧性均增加,而单位面积磨损量下降；1250℃预烧结的3Y-TZP 脆性指数为244．6,高速涡轮牙钻钻孔后边缘清晰、无崩裂现象；1500℃完全烧结后晶粒尺寸增大,维氏硬度为(9339．4±823．2) MPa,断裂韧性为(3．66±0．41)MPa·m1/2,可以满足齿科材料对力学性能的要求.
3Y-TZP (ZrO2 doped with 3 mol%Y2 O3 )dental ceramic was fabricated by slip casting and two step sintering method (pre-sintering- processing-final sintering).Effects of pre-sintering temperature on its sintering shrinkage,Vickers hardness,fracture toughness and wear loss were investigated.The machinability was evalu-ated by combination of the brittleness index and the wear loss.Also,the micro-morphology and the mechanical properties of 3Y-TZP were characterized after final sintering.Results showed that the shrinkage,Vickers hard-ness and fracture toughness of 3Y-TZP samples were enhanced and the unit area wear loss decreased when the pre-sintering temperature increased.The brittleness index of 3Y-TZP was 244.6 when it was pre-sintered at 1 250 ℃.The pore drilled by high speed turbine dental drill had sharp edge and no cracks.The gain size of 3Y-TZP increased after final sintering at 1 500 ℃ and the Vickers hardness and the fracture toughness were (9 339.4±823.2)MPa and (3.66±0.41)MPa·m1/2 respectively.It could meet the requirements of dental mate-rials on the mechanical properties.
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