摘要
Ti6Al4V钛合金是航空器中燕尾榫等构件的常用材料,面临高温域的服役环境。为研究微弧氧化(MAO)对Ti6Al4V钛合金在高温域下抗微动磨损能力的影响,采用微弧氧化在Ti6Al4V表面制备了氧化涂层,使用扫描电子显微镜(SEM)以及X射线衍射仪(XRD)对MAO涂层的微观结构和物相组成进行了表征分析,开展了300℃条件下微动磨损试验,获取了摩擦系数、磨损轮廓及微观磨损损伤形貌等。结果表明:MAO处理后Ti6Al4V表面形成厚度约10μm的涂层,涂层内产生硬质的Al_(2)TiO_(5)以及金红石TiO_(2)相。与未处理试样相比,在不同位移条件下MAO处理试样的摩擦系数、磨损体积均更低,这说明MAO改善了高温域下Ti6Al4V的微动摩擦和磨损行为。涂层硬度的增加有利于提升耐磨能力,此外,在高温环境下,MAO涂层表面更易形成致密的TiO_(2)和Fe_(2)O_(3)氧化膜层,可对基体形成保护作用。MAO涂层的磨损机制主要为剥层磨损和磨粒磨损,钛合金基体的磨损机制主要为疲劳磨损和黏着磨损。
Ti6Al4V titanium alloy is a commonly used material for components such as dovetail joints in aircraft,which must endure high-temperature service environments.In order to investigate the influence of micro-arc oxidation(MAO)on the fretting wear resistance of Ti6Al4V titanium alloy in the high-temperature range,oxide coatings were prepared on the surface of Ti6Al4V.The microstructure and phase composi-tion of the MAO coatings were characterized using scanning electron microscopy(SEM)and X-ray diffractometer(XRD).Fretting wear tests were conducted at 300℃to obtain the friction coefficient,wear profiles and microscopic wear damage morphology.Results showed that after MAO treatment,a coating with a thickness of about 10μm formed on the surface of Ti6Al4V,containing hard Al2TiO5 and rutile TiO_(2) phases.Compared to untreated specimens,the MAO-treated samples exhibited lower friction coefficients and reduced wear volumes under various dis-placement conditions,demonstrating that MAO effectively improved the fretting friction and wear behavior of Ti6Al4V in the high-temperature range.Increased coating hardness was conducive to enhanced wear resistance.Additionally,under high-temperature conditions,dense TiO_(2) and Fe_(2) O_(3) oxide films were more likely to form on the MAO-coated surface,providing protection to the substrate.Besides,the wear mechanism of the MAO coating was primarily delamination wear and abrasive wear,while the titanium alloy substrate mainly underwent fatigue wear and ad-hesive wear.
作者
祝存款
张明远
王守仁
王元杰
袁兴涛
ZHU Cunkuan;ZHANG Mingyuan;WANG Shouren;WANG Yuanjie;YUAN Xingao(School of Mechanical Engineering,University of Jinan,Jinan 250022,China;Shandong Key Laboratory of Surface Engineering and Intelligent Equipment for Key Metal Components,Jinan 250022,China)
出处
《材料保护》
2025年第7期75-84,共10页
Materials Protection
基金
国家自然科学基金资助项目(52105185,52375183)
泰山学者专项基金(2022-2027)。
关键词
TI6AL4V钛合金
高温域
微动磨损
微弧氧化
Ti6Al4V titanium alloy
high-temperature range
fretting wear
micro-arc oxidation
作者简介
通信作者:张明远(1990-),副教授,博士,主要研究方向为金属构件表面改性处理,E-mailme_zhangmy@ujn.edu.cn。
