Effect of rare earth element cerium on preparation of tungsten powders

Tungsten powders and Ce doped powders were prepared by hydrogen reduction combined with the liquid-solid doping method. The phase composition, particle size and powder morphology of Ce doped tungsten powders were analyzed by X-ray diffrac-tion, scanning electron microscopy and transmission electron...

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Published inJournal of rare earths Vol. 33; no. 5; pp. 561 - 566
Main Author 何文 谭敦强 李亚蕾 杨欣 陆磊 陆德平
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2015
Subjects
cerium
Ce掺杂
Doping
Hydrogen reduction
Nuclei
Rare earth metals
rare earths
Scanning electron microscopy
Ternary systems
Tungsten
tungsten oxide
Tungsten oxides
tungsten powders
制备
扫描电子显微镜
氢还原
稀土元素
透射电子显微镜
钨粉末
铈掺杂
tungsten oxide
hydrogen reduction
cerium
tungsten powders
rare earths
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(14)60456-7

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Summary:Tungsten powders and Ce doped powders were prepared by hydrogen reduction combined with the liquid-solid doping method. The phase composition, particle size and powder morphology of Ce doped tungsten powders were analyzed by X-ray diffrac-tion, scanning electron microscopy and transmission electron microscopy, respectively. The results indicated that 10000 ppm Ce doped tungsten oxide powders were consisted of WO3 phase and Ce4W9O33 phase. The hydrogen reduction of Ce doped tungsten powders was basically accomplished at 800 oC for 3 h. The size of Ce doped W powders was remarkably decreased compared to the undoped W powders. The phase of Ce4W9O33 was reduced to Ce2 （WO4）3 phase and Ce2W2O9 phase during the process of hydrogen reduction. Moreover, Ce2 （WO4）3 phase and Ce2W2O9 phase were observed form their morphologies, where the doping content of Ce was more than 100 ppm. The ternary phase embedding into W particles was assigned to Ce2 （WO4）3, while the ternary phase distrib-uting among W particles corresponded to Ce2W2O9. The phase of Ce2 （WO4）3 might be the nucleus of W particles and increase the number of the nucleus. And the particles of Ce2W2O9 covered WO2 particles and might inhibit the growth of W particles. These two reasons resulted in the decrease of the size of Ce doped W particles. Uniform fine W powders were fabricated with the doping content of Ce more than 100 ppm.
Bibliography:HE Wen,TAN Dunqiang,LI Yalei,YANG Xin,LU Lei,LU Deping
11-2788/TF
Tungsten powders and Ce doped powders were prepared by hydrogen reduction combined with the liquid-solid doping method. The phase composition, particle size and powder morphology of Ce doped tungsten powders were analyzed by X-ray diffrac-tion, scanning electron microscopy and transmission electron microscopy, respectively. The results indicated that 10000 ppm Ce doped tungsten oxide powders were consisted of WO3 phase and Ce4W9O33 phase. The hydrogen reduction of Ce doped tungsten powders was basically accomplished at 800 oC for 3 h. The size of Ce doped W powders was remarkably decreased compared to the undoped W powders. The phase of Ce4W9O33 was reduced to Ce2 （WO4）3 phase and Ce2W2O9 phase during the process of hydrogen reduction. Moreover, Ce2 （WO4）3 phase and Ce2W2O9 phase were observed form their morphologies, where the doping content of Ce was more than 100 ppm. The ternary phase embedding into W particles was assigned to Ce2 （WO4）3, while the ternary phase distrib-uting among W particles corresponded to Ce2W2O9. The phase of Ce2 （WO4）3 might be the nucleus of W particles and increase the number of the nucleus. And the particles of Ce2W2O9 covered WO2 particles and might inhibit the growth of W particles. These two reasons resulted in the decrease of the size of Ce doped W particles. Uniform fine W powders were fabricated with the doping content of Ce more than 100 ppm.
cerium; tungsten oxide; hydrogen reduction; tungsten powders; rare earths
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(14)60456-7