机械合金化制备Al_2O_3/Mo_5Si_3粉末研究  

The preparation of Al_2O_3/Mo_5Si_3 composite powder by mechanical alloying

作　　者：徐轲[1] 陈辉[1] 马勤[1] 赵雪[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州730050

出　　处：《粉末冶金技术》2011年第3期173-176,182,共5页Powder Metallurgy Technology

基　　金：甘肃省自然科学基金项目(3ZS061-A25-038);兰州理工大学特色研究方向梯队资助项目

摘　　要：以MoO3粉、Mo粉、Si粉和Al粉为原料,利用机械合金化制备了具有纳米晶组成的Al2O3/Mo5Si3复合粉体,利用X射线衍射（XRD）、激光粒度分析仪（LPS）和扫描电子显微镜（SEM）对A l2O3/Mo5Si3复合粉体的形成以及在球磨过程中的粉体演变进行分析和表征。结果表明：球磨10h后,原料粉末发生反应生成了Al2O3和Mo5Si3,反应速度较快。随球磨时间的延长,复合粉体的晶粒尺寸减小,微应变增大。球磨100h后,A l2O3和Mo5Si3的晶粒尺寸分别为38.3nm和39.8nm,具有纳米晶组成。粉体细化主要发生在球磨初期,球磨100h后粉体粒度曲线呈亚微米和微米双峰分布,颗粒尺寸较小,在1~3μm之间。The Al2O3/Mo5Si3 composite powder with the structure of nano-crystalline were synthesized by mechanical alloying with MoO3、Mo、Si、and Al powders as raw materials.The X-ray diffraction（XRD）、laser particle size analyzer（LPS） and the scanning electron microscopy（SEM）were used to analysis and characterize the formation of Al2O3/Mo5Si3 composite powder and the powders evolution during the ball-milling period.The result shows that after the ball-milling running for ten hours,the raw materials powders raise the reaction and generate Al2O3 and Mo5Si3,the rate of reaction is much faster.The crystal grain size reduce and the microstrain increase with prolonging time of ball-milling.The crystal grain size of Al2O3 and Mo5Si3 respectively are 38.3nm and 39.8nm after the ball-milling running for 100h,they all possess nano-crystalline structure.The refinement mainly occurs in the early ball-milling stage,after the ball-milling running for 100h,the distribution plot for particle size presents bimodal character with submicron and micron size,the particle size is much smaller and in the range of 1-3μm.

关 键 词：金属硅化物 机械合金化 晶粒尺寸 复合粉体 

分 类 号：TQ174.758[化学工程—陶瓷工业]