纯铜表面CNTs/Cu激光熔覆层的组织和性能
Microstructure and Properties of Laser-Cladded CNTs/Cu Coatings on Pure Copper Substrate
摘 要
在纯铜表面预置由质量分数为0.1%～0.5%碳纳米管与铜粉组成的混合粉, 然后采用激光熔覆技术制备了CNTs/Cu激光熔覆层, 对熔覆层的微观组织、显微硬度、耐磨性能和电导率进行了研究。结果表明: 激光熔覆层的组织均匀致密, 熔覆层中的物相有Cu相和C相; 当CNTs质量分数为0.5%时, 熔覆层的硬度可达168 HV0.05, 为铜基体的2.3倍, 其耐磨性是纯铜的3.5倍; 激光熔覆试样的电导率可达纯铜的70%, 且其电导率与CNTs含量的关系不大。
显微硬度
耐磨性能
电导率
CNTs/Cu laser cladding layer
microhardness
wear resistance
electrical conductivity
Abstract
Mixed powders consisted of copper powder and carbon nanotubes (CNTs, its contents was 0.1wt%-0.5wt%) were pre-added on the surface of pure copper to prepared CNTs/Cu laser cladding layer by laser cladding technology, and then the microstructure, microhardness, wear resistance and electrical conductivity of the cladding layer were studied. The results show that, the microstructure of CNTs/Cu laser cladding layer was even and compact, it′s phases consisted of copper and carbon.When the content of CNTs was 0.5wt%, the hardness of the layer was 168 HV0.05, which was 2.3 times as much as the hardness of the copper substrate, and its wear resistance was 3.5 times higher than that of the pure copper. After cladding, the electrical conductivity of the cladding sample decreased to about 70% value of pure copper, and its electrical conductivity had a little relationship with the contents of CNTs.
中图分类号 TG156.8 DOI 10.11973/jxgccl201607008
所属栏目 试验研究
基金项目 上海工程技术大学创新资助项目(cs1305002); 上海市教委重点项目(13zz133)
收稿日期 2015/5/28
修改稿日期 2016/6/1
网络出版日期
作者单位点击查看
备注郝俊(1993-), 男, 安徽安庆人, 本科生。
引用该论文: HAO Jun,MA Xin,LIN Wen-song. Microstructure and Properties of Laser-Cladded CNTs/Cu Coatings on Pure Copper Substrate[J]. Materials for mechancial engineering, 2016, 40(7): 35～38
郝俊,马鑫,林文松. 纯铜表面CNTs/Cu激光熔覆层的组织和性能[J]. 机械工程材料, 2016, 40(7): 35～38
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【2】张修庆, 徐祖豪, 邓鉴棋, 等. 铜基复合材料的制备方法与工艺［J］. 热加工工艺, 2007, 36(6): 73-77.
【3】刘平, 赵冬梅, 田保红, 等. 高性能铜合金加工技术［M］. 北京: 冶金工业出版社, 2005.
【4】SAVALANI M M, NG C C, LI Q H, et al. In situ formation of titanium carbide using titanium and carbon-nanotube powders by laser cladding［J］. Applied Surface Science, 2012, 258(7): 3173-3177.
【5】LI Q H, SAVALANI M M, ZHANG Q M, et al. High temperature wear characteristics of TiC composite coatings formed by laser cladding with CNT additives［J］. Surface and Coatings Technology, 2014, 239: 206-211.
【6】LIU Fang, ZHANG Yong. In-situ growth of carbon nanotubes from Ni-based coatings and their wear properties ［J］. Diamond and Related Materials, 2012, 25(5): 144-154.
【7】陈志坤, 刘敏, 曾德长, 等. 铜表面激光熔覆镍基合金的显微组织与硬度［J］. 机械工程材料, 2009, 33(1): 51-54.
【8】DEHM G, MEDRES B, SHEPELEVA L, et al. Microstructure and tribological properties of Ni based claddings on Cu substrates ［J］. Wear, 1999, 225/226/227/228/229: 18-26.
【9】LIU F, LIU C S, TAO X Q, et al. Laser cladding of Ni based alloy on copper substrate ［J］. Journal of University of Science and Technology, 2006, 13(4): 329-332.
【10】徐建林, 于涛, 杨波, 等. 工艺参数对铝青铜表面激光熔覆镍基合金温度场的影响［J］. 机械工程材料, 2011, 35(1): 93-97.
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