摘要
采用SRV-IV微动磨损试验机探究GCr15/TC4合金配副在空气介质和纯水环境中混合滑移状态下的微动磨损特性.使用激光共聚焦显微镜和扫描电镜表征三维形貌、磨损体积、磨损表面形貌,结合摩擦系数曲线和微动图探究在不同环境介质中TC4合金在混合滑移状态下微动磨损机制.结果表明:混合状态下,摩擦系数曲线在3种介质中变化趋势基本一致.干摩擦条件下,25℃空气环境中摩擦系数较高而且波动程度较大,磨损体积最大,磨损机制主要为粘着磨损和轻微的氧化磨损;300℃大气环境中,摩擦系数和波动程度最小,高温和摩擦热加速了磨粒的氧化形成第三体,揭示了TC4合金具有高温耐磨特性,磨损机制为粘着磨损和氧化磨损.与干摩擦相比,水覆环境中摩擦系数、波动程度以及磨损率介于两者之间,水介质起到润滑和减摩作用,磨损机制为磨粒磨损.
The fretting wear characteristics of GCr15/TC4 alloy pairs under mixed slip state in air medium and pure water environment were investigated by SRV-IV fretting wear tester.Three-dimensional morphology,wear volume,wear surface morphology,friction coefficient curve and fretting diagram were characterized by laser confocal microscope and scanning electron microscope to explore the fretting wear mechanism of TC4 alloy under mixed slip state in different environmental media.The results show that the change trend of friction coefficient curve in three media is basically the same.Under the condition of dry friction,the friction coefficient of air environment at 25℃is high and fluctuates greatly,the wear volume is the largest,and the wear mechanism is mainly adhesive wear and slight oxidation wear.In 300℃atmosphere environment,the friction coefficient and fluctuation degree are the smallest.High temperature and friction heat accelerate the oxidation of abrasive particles.The formation of the third body reveals that TC4 alloy has high temperature wear resistance,and the wear mechanism is adhesive wear and oxidation wear.Compared with dry friction,the friction coefficient,fluctuation degree and wear rate in water-covered environment are between them.Water medium plays a role in lubrication and antifriction,and the wear mechanism is abrasive wear.
作者
宋伟
李万佳
俞树荣
马荣荣
SONG Wei;LI Wan-jia;YU Shu-rong;MA Rong-rong(College of Petrochemical Technology, Lanzhou Univ. of Tech., Lanzhou 730050, China)
出处
《兰州理工大学学报》
CAS
北大核心
2021年第4期26-32,共7页
Journal of Lanzhou University of Technology
基金
国家重点研发计划(2020YFB2010001)。
