Ti811合金表面激光熔覆Ti2Ni+TiC+Al2O3+CrxSy复合涂层的组织和性能

doi:10.11901/1005.3093.2021.211

材料研究学报

2022, Vol. 36

Issue (1): 62-72 DOI: 10.11901/1005.3093.2021.211

研究论文

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Ti811合金表面激光熔覆Ti₂Ni+TiC+Al₂O₃+Cr_xS_y复合涂层的组织和性能

李蕊¹(

), 王浩¹, 张天刚², 牛伟³

^1.中国民航大学工程技术训练中心天津 300300
^2.中国民航大学航空工程学院天津 300300
^3.天津工业大学机械工程学院天津 300387

Microstructure and Properties of Laser Clad Ti₂Ni+TiC+Al₂O₃+Cr_xS_y Composite Coating on Ti811 Alloy

LI Rui¹(

), WANG Hao¹, ZHANG Tiangang², NIU Wei³

^1.Engineering Technology Training Center, Civil Aviation University of China, Tianjin 300300, China
^2.College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China
^3.College of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China

引用本文:

李蕊, 王浩, 张天刚, 牛伟. Ti811合金表面激光熔覆Ti₂Ni+TiC+Al₂O₃+Cr_xS_y复合涂层的组织和性能[J]. 材料研究学报, 2022, 36(1): 62-72.
Rui LI, Hao WANG, Tiangang ZHANG, Wei NIU. Microstructure and Properties of Laser Clad Ti₂Ni+TiC+Al₂O₃+Cr_xS_y Composite Coating on Ti811 Alloy[J]. Chinese Journal of Materials Research, 2022, 36(1): 62-72.

全文: PDF(29119 KB) HTML

摘要:

以TC4+Ni45+Al₂O₃+MoS₂+Y₂O₃混合粉末为熔覆材料，采用同轴送粉技术在Ti811合金表面进行激光熔覆制备复合涂层，使用SEM、EDS和XRD等手段分析了涂层的微观组织，测试了涂层的显微硬度和摩擦磨损性能。结果表明，在激光熔覆过程中Ti811合金中的Ni和C分别与Ti发生反应，原位生成金属间化合物Ti₂Ni和硬质增强相TiC；MoS₂分解后S与Cr发生硫化反应生成了软质润滑相Cr_xS_y。网状形态的Ti₂Ni、近球状和枝晶形态的TiC以及点状的Al₂O₃，均匀分布在熔覆层中。硬质相强化和软质相润滑的共同作用，使激光熔覆层具有较高的显微硬度和较优良的耐磨性能。激光功率为900 W的熔覆层其平均显微硬度值达1303.5HV_0.5，其耐磨性能最佳。

关键词 ：材料表面与界面, 激光熔覆, 复合涂层, 钛合金, 原位生成, 摩擦磨损性能

Abstract：

The composite coating of Ti₂Ni+TiC+Al₂O₃+Cr_xS_y was laser cladded on the surface of Ti811 alloy via coaxial powder feeding technology with mixed powders TC4+Ni45+Al₂O₃+MoS₂+Y₂O₃ as cladding material. The microstructure, microhardness, friction and wear properties of the coating were characterized by means of SEM, EDS, XRD, microhardness tester and friction tester. The results show that the Ni and C of Ti811 alloy react with Ti respectively during laser cladding, so that the intermetallic compound Ti₂Ni and hard reinforced phase TiC can form in situ, while the soft lubrication phase Cr_xS_y also formed due to the sulfurization reaction between S and Cr after the decomposition of MoS₂. The Ti₂Ni-phase may present as network-like, TiC as spheroidal and dendritic, while Al₂O₃ as punctiform, which all uniformly distributed in the clad coating. The combined action of strengthening of the hard phase and lubrication of the soft phase makes the laser clad coating with higher microhardness and better wear resistance. When the laser power is 900W the average microhardness of the clad coating reaches 1303.5HV_0.5 with the best wear resistance.

Key words： surface and interface in the materials laser cladding composite coatings titanium alloy in-situ tribological properties

收稿日期: 2021-04-02

ZTFLH:

TB331

基金资助:国家自然科学民航联合研究基金(U1633104);天津市科委教研计划(2019KJ119);中央高校科研基本业务费(3122017017)

作者简介: 李蕊，女，1984年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.211 或 https://www.cjmr.org/CN/Y2022/V36/I1/62

表1 Ti811合金的主要成分

表2 TC4的主要成分

表3 Ni45的主要成分

图1 激光熔覆层的表面形貌

图2 不同激光功率熔覆层的宏观截面照片

图3 不同激光功率激光熔覆层的X射线衍射谱

图4 不同激光功率激光熔覆层的横截面微观组织形貌

图5 不同激光功率激光熔覆层的微观组织形貌

图6 N2试样熔覆表面的元素分布

表4 特征相能谱分析结果

图7 Ti-C二元合金相图

图8 熔覆层的显微硬度

图9 Ti811钛合金和涂层的表面磨损形貌

图10 Ti811基材和激光熔覆涂层的摩擦系数

图11 复合涂层和基体的磨损率和磨损量

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