烧结温度对氧化锆基台材料机械性能的影响

背景：不同的烧结方法和烧结温度对氧化锆材料的机械性能有较大影响,据文献报道有关氧化锆材料的烧结方法和烧结温度有多种,如何选择适宜的烧结方法、确定最佳的烧结温度是保证其机械性能的关键。目的：观察烧结方法和烧结温度对氧化锆基台材料机械性能的影响。方法：选用纳米氧化锆粉体,通过干压成型和冷等静压技术制备实验试件。试件经1 080 ℃预烧后进行车削加工,然后分别在1 350 ℃和1 450 ℃的温度下进行二次烧结。测试两组试件经二次烧结后的弯曲强度、维氏硬度及断裂韧性等机械性能指标并进行对比分析。结果与结论：1 080 ℃/1 450 ℃烧结组试件各项机械性能均高于1 080 ℃/1 350 ℃烧结组试件,二次烧结温度为1 450 ℃时试件的三点弯曲强度、维氏硬度及断裂韧性分别为(858.74±94.94) MPa、(16.00±0.42) GPa和(6.96±0.55) MPa?m1/2。说明经1 080 ℃/1 450 ℃烧结的试件具有足够的机械性能,能够满足牙种植全瓷基台制作材料的应用要求。

Effect of sintering temperature on mechanical properties of zirconia ceramic abutment materials

BACKGROUND:Different sintering temperatures and methods greatly affect the mechanical properties of zirconia materials. There are many reports about the sintering temperatures and methods of zirconia, the key to ensure good mechanical properties is to select proper sintering method and temperature.  OBJECTIVE:To study the effects of sintering temperature and methods on mechanical properties of zirconia ceramic abutment materials.METHODS:Nano-side zirconia powder was used in the test to prepare specimens by dry press method and cold isostatic press method. The specimens were pre-sintered at 1 080 ℃, then were turned and processed. The temperatures of second-sintering were 1 350 ℃ and 1 450 ℃ respectively. These two groups of specimens were measured on flexural strength, Vicker’s hardness and fracture toughness. All the results were compared and analyzed.RESULTS AND CONCLUSION:All mechanical properties of specimens in 1 080 ℃/1 450 ℃ sintering groups were higher than that of 1 080 ℃/1 350 ℃ groups. When the second-time sintering temperature was 1 450 ℃, the three-point bending strength, Vicker’s hardness and fracture toughness were (858.74±94.94) MPa, (16.00±0.42) GPa and (6.96±0.55) MPa?m1/2 respectively. Zirconia specimens sintered at 1 080 ℃/1 450 ℃ have good enough mechanical properties to fit the requirement of all-ceramic abutment materials.