钛合金表面激光熔覆Ti/Al/B4C/C涂层组织与性能分析  

Microstructure and Properties of Ti/Al/B4C/C Coating Prepared by Laser Cladding on Titanium Alloy Surface

作　　者：王阿敏[1] 张红霞 戴景杰[1] WANG A-ming;ZHANG Hong-xia;DAI Jing-jie(Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong-Qingdao Engineering Research Center for New Metallic Functional Materials-School of Mechanical and Electronic Engineering,Qingdao Binhai University,Qingdao 266555,China)

机构地区：[1]青岛滨海学院山东省高等学校新金属功能材料及先进表面工程重点实验室青岛市新金属功能材料工程研究中心机电工程学院,山东青岛266555

出　　处：《材料保护》2020年第3期41-46,共6页Materials Protection

基　　金：山东省自然科学基金(ZR2017BEM024);山东省高校科研计划项目(J18KB005,J18KA030和J18KA047)资助。

摘　　要：针对钛合金硬度低和耐磨性差的特点,采用激光熔覆技术在TC4钛合金表面制备Ti/Al/B4C/C熔覆层,利用XRD、SEM、EDS探究熔覆层微观组织,并测试熔覆层对TC4钛合金表面硬度及耐磨性能的影响。结果表明:Ti/Al/B4C/C熔覆层中由于形成Ti B、Ti B2、Ti C等硬质陶瓷相及Ti-Al系金属间化合物和Ti3Al C相,相比于基体具有高的硬度和优异的耐磨性。熔覆层硬度在1 100~1 720 HV之间,较基体提升了2~3倍,其体积磨损率约为(2.29~4.18)×10^-6mm^3/(N·mm),较基体降低了14%~53%,其中以Ti∶Al∶B4C∶C=57∶20∶18∶5(质量比)混合粉末形成的熔覆层性能最好。For solving the disadvantages of low hardness and inferior wear resistance of Ti alloy,laser cladding technique was used to prepare Ti/Al/B4C/C cladding layers on TC4 alloy surface.The characteristics including microstructure,hardness and wear properties were examined by XRD,SEM and EDS.Results showed that the prepared Ti/Al/B4C/C cladding layer formed TiB,TiB2,TiC high-hardness ceramic phases,Ti-Al intermetallic compounds and Ti3AlC phase,which endowed the layer with higher hardness and better wear resistance compared to the substrate.The hardness of the cladding layer was in the range of 1100-1720 HV,which was about 2-3 times as great as that of the substrate.In addition,the wear rate of the cladding layer was about(2.29-4.18)×10^-6mm^3/(N·mm),which was 14%-53%lower than that of the substrate.Among them,the cladding layer obtained with mixed powder whose ratio was Ti∶Al∶B4 C∶C=57∶20∶18∶5(mass ratio)possessed the optimal properties.

关 键 词：TC4 激光熔覆 Ti/Al/B4C/C熔覆层 组织 性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]