期刊论文

Microstructure and Properties of Y_2O_3-doped Laser Cladded Composite Coating on TC4 Titanium Alloy

中文

表面技术

1001-3660

2017

46

6

238-243

10.16490/j.cnki.issn.1001-3660.2017.06.038

湖南省自然科学基金

本校为第一机构

目的提高钛合金表面的耐磨性能。方法在TiB_2:TiC=1:3的粉末配比下,添加不同质量分数Y_2O_3稀土氧化物,制备成膏状混合粉末。采用5 kW横流CO_2激光器,在TC4钛合金表面激光熔覆掺Y_2O_3的TiB_2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%Y_2O_3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1404.6HV_(0.2),是基体的3.7倍;熔覆层的磨损量减...

The work aims to improve wear resistance of TC4 titanium alloy. Pasty mixed powder was prepared at a proper ratio of TiB_2:TiC (1:3) and adding Y_2O_3 rare earth oxide in different mass fractions. Wear resistant composite coating was prepared by laser cladding Y_2O_3-doped TiB_2 and TiC powder on the surface of TC4 titanium alloy using 5 kW continuous wave CO_2 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...