牙科纳米氧化铝陶瓷粉体的制备

目的:探讨牙科纳米氧化铝陶瓷粉体的制备工艺。方法:应用溶胶-凝胶法,比较不同前驱物浓度、pH 值、热处理温度及时间等条件下所制备氧化铝粉体的物理性能。结果:Al (NO3 ) 3 ·9H2O 溶液浓度为011 molPL、pH = 9时,经1200 ℃煅烧10 min 后,可获得性能优良、粒径约为70 nm的氧化铝陶瓷粉体。结论:选择适当的反应条件可制得粒径小、团聚少的纳米氧化铝陶瓷粉体。

Preparation of Nanometer Powders of Dental Alumina Ceramics

OBJECTIVE: The purpose of this study was to explore the preparation method of nanometer powders of dental alumina ceramics. METHODS: The effects of concentration of inorganic precursors, pH value, calcination temperature and ageing time on the synthesizing process, phase composition and microstructure of the materials were studied. Aluminium nitrate with concentrations of 0.03 mol/L, 0.05 mol/L, 0.1 mol/L and 0.2 mol/L were used as inorganic precursors to prepare alumina powders via sol-gel method. Ammonia water was added into the solutions to adjust the pH values to 5, 9 and 11. The dried gel was then calcined under different temperatures, from 950 degrees C to 1200 degrees C. The prepared alumina powders were studied by using X-ray diffraction (XRD), and scanning electron microscope (SEM). RESULTS: The alumina powder which was prepared with 0.1 mol/L aluminium nitrate, pH 9, and calcined at 1200 degrees C for 10 min showed good physical characteristics. The diameter of final powder was about 70 nm. CONCLUSION: With the proper preparation condition, weakly agglomerated powders of alumina in nanometer particle size could be obtained.