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
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3 h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.
3%C-Cu复合粉末
热挤压
致密化
mechanical milling
3%C-Cu composite powder
hot extrusion
densification
Abstract
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 temperature was powered.The relative density of composites increase with extrusion ratio and the latter is the main influencing factor for the former.At the same extrusion ratio,composites with the best densification can be achieved by sintering billets prepared by 3 h-milled powders at 750 ℃.No diffusion occurs between copper and graphite within composites.
中图分类号 TF124 TB333
所属栏目
基金项目 哈尔滨市科技攻关计划资助项目(0111211104)
收稿日期 2007/4/12
修改稿日期 2007/7/13
网络出版日期
作者单位点击查看
备注金永平(1972-),男,浙江东阳人,讲师,博士.
引用该论文: JIN Yong-ping,GUO Bin,WANG Er-de. Densification of Mechanically Milled 3%C-Cu Composite Powders by Hot Extrusion[J]. Materials for mechancial engineering, 2008, 32(2): 11～14
金永平,郭斌,王尔德. 3%C-Cu机械球磨复合粉末的热挤压致密化工艺[J]. 机械工程材料, 2008, 32(2): 11～14
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参考文献
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【4】浩宏奇,丁华东,李雅文,等.工艺因素对铜石墨烧结材料性能的影响[J].西安交通大学学报,1997,31(3):120-122.
【5】李雅文,丁华东,浩宏奇,等.铜石墨材料抗弯强度与断裂机制研究[J].兵器材料科学与工程,1997,20(3):14-18.
【6】高强,吴渝英,翟宁,等.铜石墨材料导电性能研究[J].机械工程材料,2002,26(9):34-36.
【7】Zhan Y Z,Zhang G D.Graphite and SiC hybrid particles reinforced copper composite and its tribological characteristic[J].J Mater Sci Lett,2003,22:1087-1089.
【8】Paula Q,Marcos G,Ricardo S,et al.Preparation of pitch-based carbon-copper composites for electrical applications[J].Fuel,2004,83(11/12):1625-1634.
【9】张鹏,杜云慧,曾大本,等.铜石墨复合材料的半固态铸造研究[J].复合材料学报,2002,19(1):41-45.
【10】Zaidi M A,Rabinaon J S,Sheppard T.Extrusion of Al-5Fe-7Mn alloy prepared from rapidly solidified powder[J].Materials Science and Technology,1985,9(1):737-741.
【11】James W B.Powder forging[J].Reviews in Particulate Materials,1994(2):173-214.
【12】Eloff P C.Technology of powder rolling[J].Carbide and Tool Journal,1986,18(3):28-32.
【13】Marek G,Pawel K,Panya K,et al.Consolidation of metal powders during the extrusion process[J].Journal of Materials Processing Technology,2002,125/126:491-496.
【14】Roberts P R,Ferguson B L.Extrusion of metal powders[J].International Materials Reviews,1991,36(2):62-79.
【15】Marques M T,Correia J B,Conde O.Carbon solubility in nano-structured copper[J].Scripta Materialia,2004,50:963-967.
【16】金永平.机械球磨石墨/铜粉末复合材料变形工艺及组织性能[D].哈尔滨:哈尔滨工业大学,2005:29.
【17】刘京雷.Cu-15wt%Cr粉末形变复合工艺及组织性能研究[D].哈尔滨:哈尔滨工业大学,2003:40.
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