目的 提高钛合金表面的耐磨性能.方法 在TiB2:TiC=1:3的粉末配比下,添加不同质量分数Y2O3稀土氧化物,制备成膏状混合粉末.采用5 kW横流CO2激光器,在TC4钛合金表面激光熔覆掺Y2O3的TiB2和TiC粉末,制备耐磨性复合涂层.通过扫描电子显微镜(SEM)、X射线能谱仪(EDS)、X射线衍射仪(XRD)对激光熔覆层的微观形貌和组织成分进行了分析;用显微维氏硬度计对熔覆层的显微硬度进行了测量;用万能摩擦磨损试验机对熔覆层的耐磨性能进行了测试.结果 添加4%Y2O3后,熔覆层中部组织明显细化,结合区由致密组织结构转变为晶须网状结构;熔覆层的最高显微硬度为1404.6HV0.2,是基体的3.7倍;熔覆层的磨损量减少了66.67%,且其摩擦系数有明显的降低.结论 添加4%Y2O3对TC4钛合金表面激光熔覆TiB/TiC复合熔覆层耐磨性能有显著的提高.
The work aims to improve wear resistance of TC4 titanium alloy. Pasty mixed powder was prepared at a proper ratio of TiB2:TiC (1:3) and adding Y2O3 rare earth oxide in different mass fractions. Wear resistant composite coating was pre-pared by laser cladding Y2O3-doped TiB2 and TiC powder on the surface of TC4 titanium alloy using 5 kW continuous wave CO2 laser. Microstructure and composition of the laser cladding layers were analyzed with scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD); microhardness of the laser cladding layer was measured with Vickers hardness tester; and wear resistance was tested with universal friction and wear tester. After 4% Y2O3 was added, grain size of the middle structure was greatly refined; microstructure of the bonding zone was transformed from compact struc-ture to reticular whisker structure; maximum microhardness of the cladding layer was 1404.6HV0.2, 3.7 times as high as that of TC4 substrate; wear loss of the cladding layer decreased by 66.67%, and the friction coefficient decreased remarkably. Wear re-sistance of the laser cladded TiC/TiB composite cladding coating on the surface of TC4 titanium alloy can be improved signifi-cantly by adding 4% Y2O3.
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