Fe置换CoSb_3基Skutterudite化合物Co_(4-x)Fe_xSb_(12)的机械合金化-热压-退火制备工艺研究  

Synthesis of Fe Substituted CoSb_3-based Skutterudite Co_(4-x)Fe_xSb_(12) by Mechanical Alloying-Hot Pressing-Annealing

作　　者：彭江英[1] 杨君友[1] 宋新丽[1] 陈跃华[1] 鲍思前[1] 张同俊[1] 

机构地区：[1]华中科技大学材料学院模具技术国家重点实验室,湖北武汉430074

出　　处：《材料科学与工程学报》2006年第6期801-804,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50401008)

摘　　要：研究了Fe置换CoSb3基Skutterudite化合物Co4-xFexSb12(x≤1)的机械合金化及其制备工艺。在研究的成分范围内,所有的成分显示出相似的机械合金化动力学过程,初期Skutterudite相比(Co/Fe)Sb2相更易于形成,但随球磨时间进一步延长,(Co/Fe)Sb2相逐渐成为最强相。通过机械合金化不能得到单相的Skutterudite结构。球磨10小时的粉末经过热压成形后,大部分已转变为Skutterudite相,但仍有少量残存的Sb杂质。热压后进一步在650℃退火48小时后,得到了基本为单相的Skutterudite结构化合物Co4-xFexSb12(x≤0.65),且x=0.65时基本达到了Fe的置换固溶度。Mechanical alloying and preparing of Fe substituted CoSb3-based Skutterudite CO4-xFexSb12（x≤ 1 ） were studied. All the compositions showed similar kinetics in mechanical alloying, where Skutterudite phase was kinetically more favorable than （Co/Fe）Sb2 phase initially. Then the latter became the strongest phase when milling time increased further. Single phase Skutterudite structure could not be obtained via mechanical alloying. Hot pressing on the powders milled for 10 hours yielded mostly Skutterudite phase as well as minor residual Sb impurity, and single phase Skutterudite compounds were finally obtained for CO4-xFexSb12 （x≤〈0.65） after annealing at 650℃ for 48 hours. The maximal solubility for Fe substitution seemed to be reached at x = 0.65.

关 键 词：热电材料 SKUTTERUDITE 机械合金化 烧结 

分 类 号：TN304.2[电子电信—物理电子学] TF124[冶金工程—粉末冶金]