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中文摘要：
用冷冻干燥法合成了包覆型粉体,与传统方法相比,无需以纳米或微米级核颗粒为前提,过程简单,成本低。以偏钨酸铵和硫酸铝为原料,经喷雾预冻、真空冷冻干燥获得W/Al混合盐冻干前驱体,分段还原得到纳米Al2O3包覆W的复合粉体。采用XRD、IR、SEM等测试技术分析了样品的物相组成、结构、形貌,探讨了包覆结构的形成机理。结果表明：合成的包覆粉体是由40nm左右Al2O3颗粒均匀的包覆在1μm左右W颗粒表面。包覆结构的形成过程分为三个阶段：W晶粒的形核生长,非晶铝氧化合物包覆层的形成,Al2O3的非均匀形核生长。
英文摘要：
Freeze drying method for preparation of coating powders is put forward,which doesn＇t need a core particle at first compared with the conventional methods.Nano-sized Al2O3 coated W composites were prepared via freeze-drying and multi-reducing of the mixture of aluminum sulphate and AMT.The phase compositions,structure and morphologies of the composites were investigated by XRD、IR、SEM.The formation mechanism of the coating composites was also studied.The results indicate that W powders in size of 1μm have regular shape and are coated with uniform Al2O3 nanoparticles in size of 40nm.The mechanism is suggested to be three-step process： W crystallization,soft-coating formation and heterogenous alumina nucleation.
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