表面技术2017，Vol.46Issue(6)：238-243,6.DOI:10.16490/j.cnki.issn.1001-3660.2017.06.038
TC4钛合金表面激光熔覆掺Y2O3复合涂层的显微组织和性能
Microstructure and Properties of Y2O3-doped Laser Cladded Composite Coating on TC4 Titanium Alloy
摘要
Abstract
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.关键词
TC4钛合金/激光熔覆/复合涂层/显微组织/显微硬度/耐磨性能Key words
TC4 titanium alloy/laser cladding/composite coating/microstructure/microhardness/wear resistance分类
矿业与冶金引用本文复制引用
马永,朱红梅,孙楚光,廖帮亮,申龙章,何彬,朱卫华,王新林..TC4钛合金表面激光熔覆掺Y2O3复合涂层的显微组织和性能[J].表面技术,2017,46(6):238-243,6.基金项目
湖南省自然科学基金(2015JJ6098) Supported by the Hunan Provincial Natural Science Fund (2015JJ6098) （2015JJ6098）
