超高速激光熔覆Ni基Ti_(2)AlC陶瓷涂层性能  

Properties of Ni-based Ti_(2)AlC Ceramic Coatings by Ultra-high-speed Laser Cladding

作　　者：韩珩[1] 郭炜娇 于兴福 HAN Heng;GUO Weijiao;YU Xingfu(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,沈阳110142 [2]沈阳工业大学机械工程学院,沈阳110870

出　　处：《沈阳理工大学学报》2024年第6期41-47,54,共8页Journal of Shenyang Ligong University

基　　金：国家自然科学基金项目(52375456);辽宁省教育厅高等学校基本科研项目(面上项目)(JYTMS20231519)。

摘　　要：矿用液压支架立柱在井下苛刻工况下长期服役时易发生磨损、腐蚀、变形等问题,进而导致性能退化,严重时引发安全事故。为延长液压支架立柱的使用寿命,利用超高速激光熔覆技术在27SiMn钢表面上制备Ni基Ti_(2)AlC陶瓷涂层,对其微观组织结构、物相、微观硬度等进行表征,并研究其摩擦磨损性能。实验结果表明:制备的涂层与基材冶金结合强度大,涂层致密;涂层的中上部主要由黑色细胞枝晶、灰白色细胞晶体以及浅灰色连续基质组成;涂层的物相以硬质相TiC、Al_(2)O_(3),润滑相Ti_(2)AlC、微量Ti_(3)AlC_(2),金属间化合物Ni_(3)Ti、Ni_(3)Al及γ-Ni固溶体为主;涂层的平均显微硬度为5495HV_(0.2),约为基体的3倍,涂层的摩擦磨损性能相比基体显著提高。Mining hydraulic support columns are prone to wear,corrosion,deformation and other problems during long-term service in harsh underground conditions,which can lead to performance degradation and,in severe cases,safety accidents.To extend the service life of hydraulic support columns,a Ni-based Ti_(2)AlC ceramic coating is prepared on the surface of 27SiMn steel using ultra high speed laser cladding technology.The microstructure,phase,and microhardness of the coating are characterized,and its friction and wear properties are studied.The experimental results show that the coating prepared has a strong metallurgical bonding strength with the substrate,and the coating is dense.The upper part of the coating is mainly composed of black cell dendrites,gray white cell crystals,and light gray continuous matrix.The phases of the coating are hard TiC and Al_(2)O_(3),lubri-cating Ti_(2)AlC,trace Ti_(3)AlC_(2),intermetallic compounds Ni_(3)Ti,Ni_(3)Al,andγ-Ni solid solution is the main component.The average microhardness of the coating is 5495HV_(0.2),the average microhard-ness of the coating is about three times that of the substrate,and the friction and wear performance significantly improves compared to the substrate.

关 键 词：液压支架立柱 激光熔覆 Ni-Ti_(2)AlC陶瓷涂层 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]