摘要
目的:探讨预烧结温度及升温速率对氧化铝玻璃复合体性能的影响。方法:微米α-氧化铝粉经250MPa冷等静压成型,分别经高速率升温至1400℃、1450℃及低速率升温至1400℃、1450℃烧结,制备成的预烧结氧化铝块再通过1250℃4h的镧硼硅玻璃渗透,获得氧化铝玻璃复合体,测试不同烧结条件下氧化铝玻璃复合体的各种物理及力学性能,并观察它们的微观结构差异。结果:高速率升温至1400℃、1450℃以及低速率升温至1450℃烧结的氧化铝较低速率升温至1400℃烧结的氧化铝制备的复合体的抗弯强度和断裂韧性有明显增加,抗弯强度值分别为380±32.67MPa,420±25.79 MPa,411±27.73 MPa,337±23.46 MPa。低速率升温至1400℃的氧化铝玻璃复合体以沿晶断裂为主,而高速率升温至1400℃、1450℃及低速率升温至1450℃的氧化铝玻璃复合体断口,沿晶断裂和穿晶断裂同时存在。结论:复合材料最佳的力学性能、基体材料的可切削性能以及工艺等方面,以高速率升温至1450℃的预烧结氧化铝基体最为理想。
Objective: To investigate effects of presintering temperature and the speed of temperature elevation on themechanical properties of dental alumina-glass-composites. Methods: Presintered alumina was prepared by fine micron-sized alumina powder, compacted via 250MPa isostastic pressure, then presintered at 1400℃ and 1450℃ at two differenttemperature elevation speed, respectively. The final alumina-glass-composite was prepared by infiltrating the presinteredalumina with special glass at 1250℃ for 4 hours. The bend strength and breaking toughness were tested, the shrinkage ofinfiltrated composites were observed, and the microstructure was studied with scanning electron microscope(SEM). Results:The bend strength and breaking toughness increased with the presintered temperature and temperature elevation speed.The strength values of the composites were 380±32.67MPa, 420±25.79 MPa when presintered alumina at a highertemperature elevation speed to 1400℃ and 1450℃,and 337±23.46 MPa, 411±27.73 MPa at a lower temperatureelevation speed to 1400℃ and 1450℃,respectively. Conclusion: In terms of the composite strength, cutting efficiencyand manufacture procedure, it is advisable to presinter alumina at a higher temperature elevation speed to 1450℃.
出处
《口腔颌面修复学杂志》
2003年第3期162-165,共4页
Chinese Journal of Prosthodontics
基金
全军医学科学技术研究"十五"计划面上项目资助(01MA198)
