不同热处理TiN/Ti多层涂层冲蚀损伤特征与机理  

Erosion Damage Characteristics and Mechanism of TiN/Ti Multilayer Coatings of Different Heat Treatment

作　　者：杨竹芳[1] 何光宇[1] 罗思海[1] YANG Zhu-fang;HE Guang-yu;LUO Si-hai(Science and Technology on Plasma Dynamics Laboratory,Air Force Engineering University,Xi'an 710038,China)

机构地区：[1]空军工程大学等离子体动力学重点实验室,西安710038

出　　处：《表面技术》2022年第10期49-57,共9页Surface Technology

基　　金：陕西省科技计划(2022JM−270)。

摘　　要：目的通过研究分析不同热处理TiN/Ti多层涂层在冲蚀作用下的损伤特征,揭示不同热处理TiN/Ti多层涂层冲蚀损伤的机理。方法采用磁过滤阴极真空弧沉积技术在TC4钛合金表面制备TiN/Ti多层涂层,利用热处理炉对试样进行不同的热处理(300℃/40 min,空冷;400℃/40 min,空冷;300℃/40 min,空冷+300℃/40 min,空冷),采用划痕仪、显微硬度计、扫描电镜、能谱仪等设备对热处理试样涂层的结合力、显微硬度、涂层损伤形貌特征、元素分布等进行表征,并在冲蚀试验平台上通过砂尘冲蚀性能试验(速度130 m/s,角度45°)进行验证。结果TiN/Ti多层涂层在低温(≤400℃)下经短时间热处理后,涂层的物相未发生变化,仍以TiN(111)、TiN(200)、TiN(220)和TiN(311)为主,涂层结构完整,最外层的TiN涂层没有发生氧化现象,涂层结合力基本未发生改变,显微硬度略有下降,由2764.1HV分别降至2748.9HV、2493.2HV、2255.2HV。TiN/Ti多层涂层的抗冲蚀性能变化不大,冲蚀速率由0.117 mg/min分别变为0.100、0.156、0.120 mg/min。结论低温(≤400℃)短时热处理对TiN/Ti多层涂层冲蚀性能的影响不大,冲蚀损伤机理为环形裂纹引起分层剥落的脆性剥落。Sand erosion causes serious damage to the compressor blades of military helicopter engine,which has become one of the factors restricting helicopters to carry out combat/rescue missions in sand environment.Alternating soft and hard multilayer ceramic coating can properly balance strength and toughness,which is an ideal material to improve the service performance of aero-engine compressor blade under sand erosion condition.The work aims to solve the problem that the erosion failure mechanism of TiN/Ti multilayer coatings at high temperature is still unclear,and investigate the erosion damage mechanism of TiN/Ti multilayer coatings with different heat treatment.In this study,TC4 titanium alloy with a size of 50 mm×20 mm×3 mm was selected as the matrix,and then polished with metallographic sandpaper until the surface roughness reached Ra<0.20μm.The TiN/Ti multilayer coatings were prepared on the surface of TC4 substrate by magnetic filter cathode vacuum arc deposition technology.The specimens were heated in a heat treatment furnace under different conditions(300℃/40 min,air-cooled;400℃/40 min,air-cooled;300℃/40 min,air-cooled+300℃/40 min,air-cooled)to simulate its performance change under the high temperature.The adhesion strength of the coatings was tested by scratch tester(WS-2005)with the load of 80 N,loading rate of 80 N/s,and scratch length of 5 mm.The microhardness was tested by microhardness tester(SCTMC)with the load of 300 g and loading time of 15 s.Moreover,the surface morphology and cross-section morphology of the coatings were observed by scanning electron microscope(Zeiss EVO-10),and the elements distribution on the surface of the sample was tested by energy dispersive spectrometer(Bruker Xflash 6130).Afterwards,the erosion performance tests were carried out at a speed of 130 m/s and an angle of 45°on the erosion test platform to obtain the erosion resistance evolution law of the coatings under different temperature.The results indicated that after short time heat treatment at low temperatur

关 键 词：砂尘冲蚀 TiN/Ti多层涂层 温度 热处理 损伤机理 

分 类 号：TG178[金属学及工艺—金属表面处理]