【摘要】 目的 :探讨干压成型、低温烧结制备牙科纳米氧化铝陶瓷的工艺方法。方法 :采用Al2 O3-CaO -MgO -SiO2 系统来研制纳米氧化铝陶瓷 ,通过扫描电子显微镜 (SEM)及力学性能测试 ,比较了不同MgO含量、成型压力及烧结温度对氧化铝陶瓷的密度及力学性能的影响。结果 :1.2 9wt%MgO试样组的陶瓷晶粒均匀且发育比较完全 ;随着粉料成型压力的升高 ,烧结后瓷体的密度及维氏硬度均增大 ;在 130 0℃烧结后 ,晶体发育差且气孔较多 ,随着烧结温度的升高 ,晶粒逐渐增大 ,在 145 0℃时可见瓷体晶形发育较完全。结论 :选择适当的复合烧结助剂、成型压力及烧结温度可制得较理想的纳米氧化铝陶瓷更多还原

【Abstract】 Objective:The purpose of this study was to explore the preparation method of dry-pressing, low sintering temperature of dental nano alumina ceramics. Methods: According to the requirements of dental restorative materials, Al 2O 3-CaO-MgO-SiO 2 system was chosen to form dental nano alumina ceramics. Scanning electron microscope (SEM) and mechanical properties were used to observe the effects of the amounts of MgO, compaction pressure and sintering temperature on the synthesizing process, phase composition and microstructure of the material.Results:The grain size and growth of 1.29 wt % MgO group was fine. Improving compaction pressure can increase the density and Vickers hardness of sintered ceramics. The ceramic grains grew badly and contained many pores when sintered at 1 300℃. The grain size was increased with the improvement of sintering temperature. The grain growth was fine when sintered at 1 450℃. Conclusions:With proper complex sintering aids, compaction pressure and sintering temperature, fairly satisfied dental nano alumina ceramics could be obtained.更多还原