激光熔覆制备Cu-18Pb-2Sn涂层的组织与性能研究  

Study on microstructures and performances of Cu-18Pb-2Sn coating by laser cladding

作　　者：邓德伟[1,2] 郑海彤[1] 马玉山 常占东 黄治冶 孙奇[2] 吕捷 田鑫[2] DENG Dewei;ZHENG Haitong;MA Yushan;CHANG Zhandong;HUANG Zhiye;SUN Qi;LYU Jie;TIAN Xin(School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China;Shenyang Blower Works Group Corporation, SBW & DUT Research Institute, Dalian 116023, China;Wuzhong Instrument Co., Ltd., Wuzhong 751100, China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]沈阳鼓风机集团股份有限公司沈鼓-大工研究院,辽宁大连110023 [3]吴忠仪表有限责任公司,宁夏吴忠751100

出　　处：《功能材料》2020年第6期6001-6006,共6页Journal of Functional Materials

基　　金：辽宁重大装备制造协同创新中心基金;沈鼓-大工重大科研发展基金;高端控制阀产业技术协同创新中心基金;中央高校基本科研业务费专项资金.

摘　　要：探究了不同激光功率下制备的Cu-18Pb-2Sn铜合金涂层组织和性能的变化。在完成制备后,通过着色探伤对熔覆层的孔洞缺陷进行检测。利用光学显微镜(OM)、场发射扫描电子显微镜(FE-SEM)和X射线衍射仪(XRD)对熔覆层的显微组织、元素成分和物相组成进行分析检测。选择维氏硬度仪测试熔覆层的显微硬度,并采用往复高速摩擦实验机对熔覆层的摩擦磨损性能进行测试。结果表明,通过激光熔覆制备的铜合金熔覆层中存在着较多数量的孔洞,随着激光功率的逐渐增加,熔覆层内部的孔洞数量相对有所减少。熔覆层的Cu相基体中含有网状的Pb相,同时在扫描电镜下还观察到呈点状的Pb相组织。激光功率的变化并没有对硬度产生明显影响,熔覆层的平均最高硬度在77HV左右。各试样在摩擦磨损过程中以磨粒磨损为主,并伴有较少的粘着磨损发生,试样的平均摩擦因数分别为0.370、0.369、0.368和0.360。In this work,the microstructure and property improvements of Cu-18Pb-2Sn coatings by laser cladding under different processing parameters were investigated.Dye-penetrant inspection was used to detect the porosity in the cladding layer.Microstructures of the cladding layer were observed by optical microscopy(OM).Field-emission scanning electron microscopy(FE-SEM)was used to inspect the microstructure and component analysis.Microhardness of the cladding layer was measured by Vickers hardness tester.Wear resistance of the cladding layer was tested using high speed reciprocating friction testing machine.The results showed that there were a large number of holes in the copper alloy cladding layer.The number of holes in the cladding layers was relatively reduced with the gradual increase of laser power.It was observed that Pb phase presented reticular and dispersed punctate structures in Cu matrix.The variationof laser power did not have a significant effect on the hardness of the cladding layer,and the maximum average hardness of the cladding layer was around 77 HV.The friction and wear behavior of Cu alloy cladding layer was thepredominant abrasive wear with a small amount of adhesive wear.The average friction factors of the cladding layer were 0.370,0.369,0.368,and 0.360,respectively.

关 键 词：激光熔覆 铜合金 显微组织 耐磨性 

分 类 号：TG146.1[一般工业技术—材料科学与工程]