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采用水热-共还原法制备了稀土氧化物(La_2O_3,Y_2O_3)掺杂W-Cu混合粉末。通过改变稀土的添加量及添加种类,设定不同的还原温度和还原时间,在N_2/H_2还原气氛中得到还原产物。借助SEM、TEM、XRD等手段分析了复合粉末的物相、形貌、成分和微观结构,探讨了稀土掺杂对复合粉体还原温度、还原时间以及还原产物的影响。结果表明,加入稀土La_2O_3后,复合粉末的煅烧温度降低、还原温度升高,还原时间变长,稀土适合添加量为2%;单一加入La_2O_3得到复合粉末分散性好,颗粒为均匀的圆形和多边形,且相较于单一加入Y_2O_3和加入La_2O_3+Y_2O_3复合还原粉中W,Cu混合最为均匀。
Rare earth oxides (La_2O_3, Y_2O_3) doped W-Cu mixed powders were prepared by hydrothermal-co-reduction method. By changing the amount of rare earth added and the type of addition, different reduction temperatures and reduction times were set, and the reduction products were obtained in a reducing atmosphere of N 2 / H 2. The phase, morphology, composition and microstructure of the composite powders were analyzed by means of SEM, TEM and XRD. The effects of rare earth doping on the reduction temperature, reduction time and reduction products of the composite powders were also discussed. The results show that the addition of rare earth La 2 O 3 can decrease the calcination temperature, increase the reduction temperature and decrease the time of the composite powders, and the addition amount of rare earth is 2%. La 2 O 3 is added to obtain composite powder with good dispersibility and uniform particle size. Compared with single addition of Y_2O_3 and addition of La_2O_3 + Y_2O_3 composite reduction powder W, Cu is the most uniform mixing.