Effect of La_(2)O_(3) addition on the synthesis of tungsten nanopowder via combustion-based method  

作　　者：Zheng Chen Mingli Qin Junjun Yang Lin Zhang Baorui Jia Xuanhui Qu 

机构地区：[1]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Materials Science & Technology》2020年第23期24-33,共10页材料科学技术（英文版）

基　　金：financially supported by the National Key R&D Program of China (2017YFB0306000 and 2017YFB0305600);the National Natural Science Foundation Program of China (51574031,51604239,51604240 and 51674095);the Natural Science Foundation Program of Beijing (2162027);the General Project of the Education Department of Hunan Province (15C1308);the Fundamental Research Funds for the Central Universities(JZ2017HGBZ0920)。

摘　　要：In this study, the influences of La_(2)O_(3) added on the phase, morphology and reduction process of tungsten oxide prepared by solution combustion synthesis(SCS) were investigated for the first time. And tungsten nanopowders with different La_(2)O_(3) doping amount(0.5~5.0 wt%) were successfully prepared by SCS and followed hydrogen reduction. The results showed that with the increase of La_(2)O_(3) addition,the product synthesized by SCS changed from needle-like W_(18) O_(49) to irregularly granulated H0.53 WO3 and the complete reduction temperature also increased form 700°C to 850°C. The densification behavior of as-prepared W nanopowders revealed that the densification inhibitory effect of La_(2)O_(3) was enhanced as the La_2O_3 addition increased. Nevertheless, due to the optimal size and distribution of La_(2)O_(3) particles,the sample with 2.0 wt% La_(2)O_(3) addition has a smallest grain size of 0.47 μm and a highest microhardness value of 739.3 Hv0.2, which are the best compared with the literature.

关 键 词：Tungsten nanopowder La_(2)O_(3)doped Solution combustion synthesis Influence 

分 类 号：TB383.1[一般工业技术—材料科学与工程]