机械合金化制备TiC/W纳米晶复合粉体的烧结特性
Sintering Property of TiC/W Nanocomposite Powders Prepared by Mechanical Alloying
摘 要
利用高能机械球磨制备出W-10%TiC复合粉体并进行烧结,分析了粉体特性和烧结体的组织形貌.结果表明:球磨使引入的镍铁和钨形成固溶体,并且产生大量缺陷,从而促进烧结致密化.随着球磨时间的延长,粉体晶粒尺寸下降,点阵畸变逐渐增大,经过球磨后粉体具有较高的烧结活性,并且随着球磨时间的延长,复合粉体烧结后密度逐渐增加.烧结体显微组织均匀致密,没有间隙和空洞出现,其中钨颗粒近似呈球状,粒径为20~30 μm,碳化钛颗粒基本保持原始颗粒大小(1~2 μm)弥散分布在相邻的钨颗粒边界处;钨镍铁相呈网状组织包围着部分钨和碳化钛颗粒,其体积随着球磨时间延长而增加.
高能球磨
纳米晶复合粉体
烧结特性
W-TiC
high energy mechanical milling
nanocomposite powder
sintering property
Abstract
W-10%TiC composite powders were prepared by ball milling.Powder properties and structures of sintered samples were analyzed.The results show that Ni and Fe are induced into powders and large number of defects are formed.The powders have a higher sintering activity after ball milling.All these improve sintering densification of powders.Ni and Fe form (Ni,Fe,W) solid solution during mechanical milling.The grain size of powders decrease gradually,and the lattice distortion increase with increasing milling time.In the microstructure tungsten grains presente a sphere-like shape and have a size of 20-30 μm and TiC particles keep their original size of 1-2 μm and distributed at the tungsten grain boundaries,and there is no obvious hole or interstice in the sintering structure.(Ni,Fe,W) phase surrounded tungsten grains as a reticulation and its volume increase with increasing ball milling time.
中图分类号 TB331 TF124
所属栏目
基金项目 合肥工业大学中青年创新群体基金资助项目(103-037016);中国科学院等离子体物理研究所合作项目
收稿日期 2006/8/21
修改稿日期 2006/11/2
网络出版日期
作者单位点击查看
备注陈勇(1979-),男,河南信阳人,博士研究生.
引用该论文: CHEN Yong,WU Yu-cheng,YU Fu-wen,CHEN Jun-ling. Sintering Property of TiC/W Nanocomposite Powders Prepared by Mechanical Alloying[J]. Materials for mechancial engineering, 2007, 31(7): 4～7
陈勇,吴玉程,于福文,陈俊凌. 机械合金化制备TiC/W纳米晶复合粉体的烧结特性[J]. 机械工程材料, 2007, 31(7): 4～7
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