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...
出处
《机械工程材料》
CAS
CSCD
北大核心
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)
