稀土含量和还原温度对制备超细(W,Ni,Fe)复合粉末的影响  

Effects of rare earth content and reduction temperature on preparation of superfine(W,Ni,Fe) composite powder

作　　者：彭石高[1] 范景莲[1] 刘涛[1] 祁美贵[1] 丁飞[1] 田家敏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金技术》2009年第1期36-39,66,共5页Powder Metallurgy Technology

基　　金：国家自然科学基金项目(50674106);国家高技术研究发展计划资助项目(2006AA03A213)

摘　　要：采用溶胶-喷雾干燥-氢还原法制备了含稀土Y的超细(W,Ni,Fe)复合粉末,研究还原温度和稀土Y含量变化时对超细复合粉末性能的影响。结果表明:在超细W-Ni-Fe粉末中,稀土Y以复合氧化物形式存在。还原温度和稀土Y含量对稀土复合氧化物的组成有很大影响:在600℃以下,稀土Y以复合氧化物Y2W3O12的形式存在;在700℃以上,稀土Y含量为5%时,稀土Y最终以Y2WO6的形式存在;稀土Y>10%以上时,稀土以Y2WO6和Y6W2O15两种低价复合氧化物的形式存在。Superfine （W, Ni, Fe） composite powder with rare earth Y was prepared by sol-spray drying-hydrogen reduction process. Effects of reduction temperature and rare earth Y content on the properties of the superfine composite powder were studied. The results show that rare earth Y in superfine W-Ni-Fe powder exists as composite oxides. Reduction temperature and content of rare earth Y have considerable effect on the composition of the composite oxides with rare earth. Under 600℃ , rae earth Y exists as composite oxide Y2W3O12, and above 700℃ rare earth Y exists as Y2WO6 when Y content is 5 %. When Y content 〉 10 % rare earth Y exists as Y2WO6 and Y6W2O15.

关 键 词：W-Ni-Fe复合粉末 纳米级粉末 氢还原 稀土Y 

分 类 号：TF123.74[冶金工程—粉末冶金] TQ444.6[冶金工程—冶金物理化学]