【摘要】 目的:制备分散性好,粒度均匀的纳米α-A l2O3粉体。方法:应用超声波-化学沉淀法,制备氢氧化铝前驱体,经900℃、1 000℃、1 100℃、1 200℃煅烧后测试粉体性能。结果:1 200℃煅烧得到的A l2O3粉体为α-A l2O3,其晶粒平均粒径为D202=31.44 nm。结论:以乙醇为反应溶剂,在低频超声波作用下可制备出分散性好、粒度均匀的纳米级α-A l2O3粉体。更多还原

【Abstract】 Objective: To prepare α-Al₂O₃ nano powder with dispersed and uniformed particles.Methods: We firstly prepared the precursor of aluminum hydroxide by the ultrasonic-chemical precipitation,then tested the characteristics of the powder sintered at 900 ℃,1 000 ℃,1 100 ℃ and 1 200 ℃ for 1 hour.Results: The powder sintered at 1 200 ℃ for 1 hour was α-Al₂O₃ whose average particle size was D₂₀₂=31.44 nm.Conclusion: We could abtain α-Al₂O₃ nano-powder with dispersed and uniformed particles when used the alcohol as reactive agent and under the action of low-frequent ultrasonic,which had the effect of anti-aggregation.更多还原