稀土镧、钇对蓝色氧化钨氢还原的影响

Effect of La and Y on Hydrogenolysis of Blue W O xide

借助于ＳＥＭ、Ｘ射线衍射技术及ＩＰＰ粉末粒度仪等系统地研究了稀土镧、钇对蓝色氧化钨（ＢＯ）氢还原的影响。结果表明：稀土元素镧、钇在蓝色氧化钨的还原钨粉中以氧化物及钨酸盐形式存在；还原后所得的钨粉颗粒大多为规则形状的多面体；稀土镧、钇和铝相似，强烈地抑制ＢＯ氢还原钨粉颗粒的长大，而且钇的作用更为显著。

he effects of two kinds of rare earth elements La and Yon the size as well as the morphology of tungsten particles during hydrogenolysis were investigated by using SEM, X-ray difftaction and IP(Instrument-determination of powder and porous-material). The results indicated that in tungsten powders, the La and Y exist in the forms of oxides(La2O3, Y2O3) and tungstates (La2W2O9, Y6WO(12)) and the most of tungsten powders are regular polyhedrons. The existence of La and Y hinders drastically the growth of tungsten particles during hydrogenolysis of blue W oxide, and the effect of Y is greater than that of La.