摘要
采用压制-烧结-熔渗工艺,制备一种高性能铁基粉末冶金气门座圈材料,在SRVⅣ摩擦磨损试验机上对比研究不同渗铜量下材料的微动磨损性能。结果表明:在一定范围内随着渗铜量的增加,试样密度、硬度及压溃强度显著提高,摩擦因数与磨损体积降低,磨损机理发生不同程度的变化。未渗铜或渗铜量低时,试样磨损机理主要表现为磨粒磨损及疲劳剥落;渗铜量为10%(质量分数,下同)的试样磨损机理为轻微磨粒磨损和疲劳剥落;渗铜量为15%的试样表现出最优抗微动性能,仅有轻微黏着磨损;当渗铜量达20%时,试样力学性能下降,磨损体积增大,磨损机理转变为以黏着磨损为主。渗铜后的试样抗微动磨损性能更优异。
A high quality iron-based P/M valve seat material was prepared by pressing,sintering,and copper infiltration.Fretting wear experiments were carried out by SRV Ⅳ tester to investigate the effect of the amount of infiltration on fretting wear properties of valve seat material.The results indicate that within certain range,with the increase of the amount of infiltration,higher density,hardness and crushing strength of the material are obtained,the friction coefficient and wear volume are reduced as well,and the wear mechanism changes in different degrees.The wear mechanisms of the specimens infiltrated with low amount of copper or without infiltration are mainly abrasive wear and fatigue spalling.When infiltrated with 10%Cu(mass fraction,the same below),the specimens are worn in the form of slight abrasive and fatigue spalling.The specimens infiltrated with 15%Cu show the best fretting wear resistance with very slight adhesive wear.As the infiltration amount reaches20%,the mechanical properties of the specimens decline,the wear volume increases simultaneously,and adhesive wear is the main wear mechanism.The copper infiltrated specimens show better wear resistance than the substrate.
作者
屈盛官
杨章选
赖福强
和锐亮
付志强
李小强
QU Sheng-guan;YANG Zhang-xuan;LAI Fu-qiang;HE Rui-liang;FU Zhi-qiang;LI Xiao-qiang(National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China;Schoolof Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2018年第7期136-143,共8页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(41572362
51375466
51275494)
广东省科技装备动员项目资助(2016KZ010104)
关键词
粉末冶金
气门座圈
渗铜
微动磨损
磨损机理
powder metallurgy
valve seat
copper infiltration
fretting wear
wear mechanism