Preparation and characterization of Ce–W composite nanopowder
Preparation and characterization of Ce–W composite nanopowder
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DOI：
10.1016/j.msea.2004.11.052
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发表时间：
2005-03
期刊：
影响因子：
6.4
通讯作者：
X. Xi;Z. Nie;Jiancan Yang;Xiaotian Fu;Wen Wang;T. Zuo
中科院分区：
文献类型：
--
作者：
X. Xi;Z. Nie;Jiancan Yang;Xiaotian Fu;Wen Wang;T. Zuo
铈钨复合纳米粉体的制备在相关合金的制备中具有重要的意义。本文采用液液混合、冷冻干燥、两段还原法制备了铈钨复合纳米粉体。所产生的粉末的粒度在20和30 nm的范围内。结果表明，该粉末组织均匀，Ce分布均匀。利用XRD分析了纳米粉体制备过程中的物相组成。采用SEM、FESEM和TEM对冻干粉、还原粉和纳米粉的形貌进行了分析。研究结果表明，大部分粉体以非吸湿、非晶态存在。实验的最终产物为W-Ce 2 WO 6纳米粉体，其以晶态的形式存在。红外光谱分析表明，冻干粉仍保持Keggin结构。此外，TG和DTA热分析表明，粉末中的水分损失可以分三个阶段进行。
The synthesis of Ce–W composite nanopowder plays an important role in the preparation of relevant alloys. In the paper, the Ce–W composite nanopowder were prepared by liquid–liquid mixing, freeze drying, and two-stage reduction. The particle size of the powder produced is in the range of 20 and 30nm. Homogeneous microstructure and uniform distribution of Ce were found in this powder. The phase compositions during the producing process of nanopowder were studied by XRD. The appearances of the freeze-dried powder, the first-reduced treated powder, and the finally obtained nanopowder were analyzed by SEM, FESEM, as well as TEM. Research results showed that most of the powders existed in the non-hygroscopic and non-crystalline state. The final product of the experiments was the W–Ce2WO6nanopowder, which existed in the form of crystalline state. IR analysis indicated that the freeze-dried powder remained a Keggin structure. In addition, the TG and DTA thermal analysis explained that the losing water contained in the powders could be processed in three stages.