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.
作者
王阿敏
张红霞
戴景杰
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)
出处
《材料保护》
CAS
CSCD
北大核心
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。
