| TC4钛合金表面激光熔覆掺Y2O3复合涂层的显微组织和性能 |
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| 引用本文： | 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. |
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| 作者姓名： | 马永 朱红梅 孙楚光 廖帮亮 申龙章 何彬 朱卫华 王新林 |
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| 作者单位： | 南华大学机械工程学院,湖南 衡阳,421001;南华大学电气工程学院,湖南 衡阳,421001;南华大学机械工程学院,湖南 衡阳 421001;南华大学电气工程学院,湖南 衡阳 421001 |
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| 基金项目： | 湖南省自然科学基金（2015JJ6098） |
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| 摘 要： | 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 k W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1404.6HV0.2,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%Y_2O_3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。
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| 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 |
| 收稿时间： | 2017/1/23 0:00:00 |
| 修稿时间： | 2017/6/20 0:00:00 |
Microstructure and Properties of Y2O3-doped Laser Cladded Composite Coating on TC4 Titanium Alloy |
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| MA Yong,ZHU Hong-mei,SUN Chu-guang,LIAO Bang-liang,SHEN Long-zhang,HE Bin,ZHU Wei-hua and WANG Xin-lin.Microstructure and Properties of Y2O3-doped Laser Cladded Composite Coating on TC4 Titanium Alloy[J].Surface Technology,2017,46(6):238-243. |
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| Authors: | MA Yong ZHU Hong-mei SUN Chu-guang LIAO Bang-liang SHEN Long-zhang HE Bin ZHU Wei-hua and WANG Xin-lin |
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| Affiliation: | a.School of Mechanical Engineering, University of South China, Hengyang 421001, China,a.School of Mechanical Engineering, University of South China, Hengyang 421001, China,a.School of Mechanical Engineering, University of South China, Hengyang 421001, China,a.School of Mechanical Engineering, University of South China, Hengyang 421001, China,a.School of Mechanical Engineering, University of South China, Hengyang 421001, China,a.School of Mechanical Engineering, University of South China, Hengyang 421001, China,b.School of Electrical Engineering, University of South China, Hengyang 421001, China and a.School of Mechanical Engineering, b.School of Electrical Engineering, University of South China, Hengyang 421001, China |
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| 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 prepared 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 structure 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 resistance of the laser cladded TiC/TiB composite cladding coating on the surface of TC4 titanium alloy can be improved significantly by adding 4% Y2O3. |
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| Keywords: | TC4 titanium alloy laser cladding composite coating microstructure microhardness wear resistance |
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