Influence of Yttrium Addition on the Reduction Property of Tungsten Oxide Prepared via Wet Chemical Method

doi:10.1007/s40195-019-00975-3

Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (2): 275-280.DOI: 10.1007/s40195-019-00975-3

收稿日期:2019-07-30 修回日期:2019-09-17 出版日期:2020-02-10 发布日期:2020-03-23

Influence of Yttrium Addition on the Reduction Property of Tungsten Oxide Prepared via Wet Chemical Method

Nan Liu¹, Zhi Dong¹, Zongqing Ma¹(), Zhu Qian², Lei Ma², Liming Yu¹(), Yongchang Liu¹

1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
2. Tianjin Zhujin Technology Development Corporation, Tianjin, 300400, China

Received:2019-07-30 Revised:2019-09-17 Online:2020-02-10 Published:2020-03-23
Contact: Ma Zongqing,Yu Liming

摘要/Abstract

Abstract:

W-Y₂O₃ composite nanopowders prepared via wet chemical method exhibit unique morphologies and microstructures. The yttrium addition during chemical reaction process affects not only the composition of tungsten acid hydrate precursors, but also the reduction property of tungsten oxide transformed from precursors. In this study, the morphology evolution of the samples with and without yttrium during reduction process has been studied, and it is found that the addition of yttrium can exert a strong influence on the reduction route of tungsten oxide and the final morphology of tungsten particles. The cause of the difference of reduction route and tungsten particle morphology is also analyzed. It is suggested that the composition of the samples with yttrium at the beginning of reduction is pure cubic system WO₃(c-WO₃), and the c-WO₃ particles have c-WO₃ whiskers attached to the surface. This kind of whiskers is essential for c-WO₃ to be reduced directly to tungsten and also helpful to obtain W-Y₂O₃ powders with small size and good uniformity.

Key words: W-Y₂O₃ nanopowders, Wet chemical method, Reduction property

. [J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 275-280.

Nan Liu, Zhi Dong, Zongqing Ma, Zhu Qian, Lei Ma, Liming Yu, Yongchang Liu. Influence of Yttrium Addition on the Reduction Property of Tungsten Oxide Prepared via Wet Chemical Method[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 275-280.

图/表 6

Fig. 1 XRD patterns of phase change during hydrogen reduction of the samples a with yttrium, b without yttrium

Fig. 2 Morphology evolvement during hydrogen reduction process of the samples with yttrium

Fig. 3 Morphology evolvement during hydrogen reduction process of the samples without yttrium

Fig. 4 Variation of the average grain size with reducing time of the two kinds of the samples calculated by Scherrer’s equation

Fig. 5 TEM images of the samples with yttrium obtained at different times: a 0 min, b 30 min, c 50 min after reduction started, d SEM image of sample with yttrium obtained at 4 h after heating at 600 °C under Ar atmosphere

Fig. 6 Diagrammatic sketch of transformation process of the samples with yttrium during reduction

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Influence of Yttrium Addition on the Reduction Property of Tungsten Oxide Prepared via Wet Chemical Method

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