引用本文:张诗怡,刘秀波,刘一帆,祝杨,张林,孟元,梁金.Ti6Al4V合金激光熔覆Co-Cu/Ti3SiC2复合涂层组织与摩擦学性能∗[J].中国表面工程,2021,34(6):124~133
ZHANG Shiyi,LIU Xiubo,LIU Yifan,ZHU Yang,ZHANG Lin,MENG Yuan,LIANG Jin.Microstructure and Tribological Properties of Co-Cu / Ti 3 SiC2 Composite Coatings on Ti6Al4V Alloy by Laser Cladding[J].China Surface Engineering,2021,34(6):124~133
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Ti6Al4V合金激光熔覆Co-Cu/Ti3SiC2复合涂层组织与摩擦学性能∗
张诗怡1, 刘秀波1,2,3, 刘一帆1, 祝杨1, 张林2, 孟元1, 梁金1
1.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 长沙 410004;2.安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室 马鞍山 243002;3.中南林业科技大学工程流变学湖南省重点实验室 长沙 410004
摘要:
为突破 Ti6Al4V 合金在关键运动零部件的应用限制,提高其耐磨减摩性能并延长稳定服役周期,采用激光熔覆技术成功在其表面制备 Co-5%Ti 3 SiC2 、Co-5%Ti 3 SiC2 -10%Cu、Co-5%Ti 3 SiC2 -20%Cu (wt. %) 三种配比的复合涂层,系统分析三种复合涂层的微观组织、物相、显微硬度以及室温和 600 ℃ 下的摩擦学性能和磨损机理。 研究发现:Co-5%Ti 3 SiC2 涂层主要由γ-Co 固溶体、润滑相 Ti 3 SiC2 、硬质相 TiC 和金属间化合物 CoTi x 构成,含 Cu 涂层出现新物相 Cu 及 CuTi x。 性能上,复合涂层的显微硬度均得到大幅提高,达到 Ti6Al4V 基体(370 HV0. 5 )的 2. 1 ~ 2. 4 倍。 室温下,Co-5%Ti 3 SiC2 -10%Cu 涂层表现出最好的减摩性能,摩擦因数降低了 68. 7%;而在 600 ℃ 下,复合涂层发生严重氧化,形成氧化膜使磨损率降低,其中 Co-5%Ti 3 SiC2-20%Cu 涂层磨损率为 2. 5×10-7 mm 3 / N·m,表现出最好的耐磨性。 探索了一类新的耐磨减摩涂层体系,表现出良好的提升效果,并揭示了 MAX 相与传统软金属之间的协同润滑过程。
关键词:  Ti6Al4V 合金  激光熔覆  耐磨性能  减摩性能  复合涂层
DOI：10.11933/j.issn.1007-9289.20210707002
分类号:TG146;TH117
基金项目:国家自然科学基金(52075559)；湖南省重点研发计划(2022GK2030)；湖南省自然科学基金(2021JJ31161)；先进金属材料绿色制备与表面技术教育部重点实验室开放基金 (GFST2021KF03)；湖南省研究生科研创新(CX20210864)资助项目
Microstructure and Tribological Properties of Co-Cu / Ti 3 SiC2 Composite Coatings on Ti6Al4V Alloy by Laser Cladding
ZHANG Shiyi1, LIU Xiubo1,2,3, LIU Yifan1, ZHU Yang1, ZHANG Lin2, MENG Yuan1, LIANG Jin1
1.Hunan Province Key Laboratory of Materials Surface / Interface Science & Technology,Central South University of Forestry & Technology, Changsha 410004 , China;2.Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education, Anhui University of Technology, Maanshan 243002 , China;3.Hunan Province Key Laboratory of Engineering Rheology, Central South University ofForestry & Technology, Changsha 410004 , China
Abstract:
In order to break through the application limitation of Ti6Al4V alloy in key moving parts, three composite coatings of Co-5% Ti 3 SiC2 , Co-5%Ti 3 SiC2 -10%Cu, Co-5%Ti 3 SiC2 -20%Cu (wt. %) are successfully prepared on the surface of Ti6Al4V alloy by laser cladding to improve its wear resistance and friction reduction performance and extend the stable service cycle. Their microstructure, phase, microhardness as well as tribological properties and wear mechanisms are systematically investigated at room temperature (RT) and 600 ℃ . The study shows that Co-5%Ti 3 SiC2 coating is mainly composed of γ-Co solid solution, lubricating phase Ti 3 SiC2 , hard phase TiC as well as intermetallic compounds CoTi x, and the new phases Cu and CuTi x appear in the Cu containing coatings. In terms of performance, the microhardness of the composite coatings is greatly improved, which is 2. 1 ~ 2. 4 times of the Ti6Al4V substrate (370 HV0. 5 ). At RT, the Co-5%Ti 3 SiC2 -10%Cu coating exhibits the best friction reduction performance, and the coefficient of friction (COF) is reduced by 68. 7%. At 600 ℃ , the composite coatings are seriously oxidized and form an oxide film, which reduces the wear rate, in which the wear rate of Co-5%Ti 3 SiC2 -20%Cu coating is 2. 5×10-7 mm 3 / N·m, showing the best wear resistance. This paper explores a new kind of wear-resistant and anti-friction coating system, shows a good improvement effect, and reveals the synergistic lubrication process between MAX phase and traditional soft metals.
Key words:  Ti6Al4V alloy  laser cladding  wear-resistance  friction reduction performance  composite coatings
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