金属热处理 ›› 2021, Vol. 46 ›› Issue (12): 199-203.DOI: 10.13251/j.issn.0254-6051.2021.12.032

• 组织与性能 • 上一篇    下一篇

Ti6Al4V合金激光熔覆Co-Ti3SiC2复合涂层的组织和摩擦学性能

孟祥军1, 沈颖1, 张少瑜1, 许宏良1, 汪阳2, 刘秀波2   

  1. 1.江苏城乡建设职业学院, 江苏 常州 213147;
    2.中南林业科技大学 材料表界面科学与技术湖南省重点实验室, 湖南 长沙 410004
  • 收稿日期:2021-07-28 出版日期:2021-12-25 发布日期:2022-02-18
  • 作者简介:孟祥军(1987—),男,讲师,硕士,主要研究方向为金属材料表面工程,E-mail:mengxj0819@126.com
  • 基金资助:
    常州市科技计划(CJ2020026);江苏省教育厅高校自然科学研究面上项目B类(20KJB430040);江苏城乡建设职业学院校级课题(2020KYC001)

Microstructure and tribological properties of laser clad Co-Ti3SiC2 composite coating on Ti6Al4V alloy

Meng Xiangjun1, Shen Ying1, Zhang Shaoyu1, Xu Hongliang1, Wang Yang2, Liu Xiubo2   

  1. 1. Jiangsu Urban & Rural Construction College, Changzhou Jiangsu 213147, China;
    2. Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, Central South University of Forestry & Technology, Changsha Hunan 410004, China
  • Received:2021-07-28 Online:2021-12-25 Published:2022-02-18

摘要: 为改善Ti6Al4V合金的摩擦学性能,分别用纯Co、Co-2%Ti3SiC2、Co-5%Ti3SiC2、Co-8%Ti3SiC2混合粉末为原料,在Ti6Al4V合金表面激光熔覆制备复合涂层,利用X射线衍射仪(XRD)、扫描电镜(SEM)以及摩擦磨损试验机分析物相组成、显微组织结构以及在常温下的摩擦学性能。结果表明:所有复合涂层与基体结合良好,伴有少部分微孔。纯Co涂层的主要物相为γ-Co、CoTi、CoTi2等,而Co-Ti3SiC2涂层物相包括γ-Co、CoTi、CoTi2、TiC、Ti5Si3和残留的Ti3SiC2。涂层的硬度相对基体提高了1.90~2.15倍,而耐磨性能相应提高了3.02~5.44倍。

关键词: 激光熔覆, Co-Ti3SiC2涂层, Ti6Al4V合金, 摩擦学性能

Abstract: To improve the tribological properties of Ti6Al4V alloy, the laser clad composite coatings were prepared on the surface of Ti6Al4V alloy using pure Co powder, Co-2%Ti3SiC2, Co-5%Ti3SiC2, and Co-8%Ti3SiC2 mixed powder as raw materials. The phase composition, microstructure and tribological properties of the coatings at room temperature were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and friction wear testing machine. The results show that all the composite coatings are bonded well with the substrate, with some porosities observed, and the main phases of the pure Co coating consist of γ-Co, CoTi, and CoTi2, while the phases of the Co-Ti3SiC2 coatings consist of γ-Co, CoTi, CoTi2, TiC, Ti5Si3 and residual Ti3SiC2. The hardness of the coatings is increased by 1.90-2.15 times compared with the matrix, and the wear resistance is correspondingly improved by 3.02 to 5.44 times.

Key words: laser cladding, Co-Ti3SiC2 coating, Ti6Al4V alloy, tribological properties

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