3%C-Cu机械球磨复合粉末的热挤压致密化工艺  

Densification of Mechanically Milled 3%C-Cu Composite Powders by Hot Extrusion

作　　者：金永平[1] 郭斌[1] 王尔德[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《机械工程材料》2008年第2期11-14,共4页Materials For Mechanical Engineering

基　　金：哈尔滨市科技攻关计划资助项目(0111211104)

摘　　要：为了提高3%C-Cu机械球磨复合粉末烧结坯的相对致密度,采用热挤压法制备了复合材料;研究了球磨时间、挤压温度和挤压比对挤压力和复合材料相对致密度的影响,并用扫描电镜分析了其显微组织。结果表明:延长球磨时间或降低挤压温度,均引起挤压力的增大;复合材料的相对致密度随挤压比的增大而增加,挤压比是影响相对致密度的主要因素;挤压比相同时,球磨3h粉末的烧结坯在750℃挤压所得复合材料的致密效果最好;复合材料中铜与石墨之间没有扩散。To improve the relative density of sintering billets made of mechanically milled composite powders,3%C-Cu composites have been prepared by hot extrusion.Effect of milling time,extrusion temperature and extrusion ratio on extrusion pressure and the relative density of 3%C-Cu composites was investigated.The microstructure was also analyzed by field emission scanning electron microscopy.The results show that extrusion pressure increase when mechanical milling time of powders was prolonged or extrusion temperat...

关 键 词：机械球磨 3%C-Cu复合粉末 热挤压 致密化 

分 类 号：TG376.2[金属学及工艺—金属压力加工]