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首页> 外文会议>International Workshop on Advanced Metallic Materials and Processing Techniques for Aeronautical Applications; 20051118-20; Nanjing(CN) >Preparation and modification of nano-sized Al_2O_3 powders through addition of oxide
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Preparation and modification of nano-sized Al_2O_3 powders through addition of oxide

机译：通过添加氧化物制备和改性纳米Al_2O_3粉末

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摘要

Ammonium aluminum carbonate hydroxide (AACH) , the precursor of α-Al_2O_3, was fabricated with NH_4 Al(SO_4)_2 and NH_4HCO_3 via a precipitation method. During the heat treatment AACH undergoes such a phase transformation process: amorphous(350℃) ? γ(700℃ → γ + θ(1 050℃) →θ + α (1 100℃) → α (1 200℃). Oxides, such as TiO_2 sol and MgO sol were introduced into the precursor. Then both the α transformation temperature and the particle sizes of α-Al_2O_3 are decreased. The microstructures and its surface electronic properties of the powders are modified, and its dispersion property is improved. Doping TiO_2 sol grains, AACH completes α phase transformation nearly at 1 100℃, its first-order diameter is about 120 nm. Doping with MgO sol grains, α phase transformation completes after being sintered at 1 100℃.
机译：用NH_4 Al（SO_4）_2和NH_4HCO_3沉淀法制备了α-Al_2O_3的前驱体碳酸铝铵（AACH）。在热处理过程中，AACH经历了这样的相变过程：非晶态（350℃）？ γ（700℃→γ+θ（1,050℃）→θ+α（1,100℃）→α（1,200℃），先将TiO_2溶胶，MgO溶胶等氧化物引入前驱体，然后进行α相变降低了温度，降低了α-Al_2O_3的粒径；改变了粉末的微观结构和表面电子性能；改善了分散性能；掺杂TiO_2溶胶颗粒，AACH首次在1100℃左右完成了α相转变。有序直径约为120 nm，掺杂MgO溶胶颗粒，在1100℃烧结后，α相转变完成。

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