摘要
为改善高密度聚乙烯(HDPE)的力学性能、自润滑性和耐磨性,以HDPE为基体,通过填充六钛酸钾晶须(PTW)、聚四氟乙烯(PTFE)和滑石粉制备一种HDPE复合材料。在MMW-1型摩擦磨损试验机上测试复合材料在不同载荷和转速下的摩擦因数、磨损率,采用扫描电镜(SEM)分析磨痕形貌,探讨HDPE复合材料的摩擦磨损规律。结果表明:载荷对复合材料的摩擦因数和磨损率都有显著影响,当载荷增大时,HDPE复合材料的摩擦因数减小,磨损率增大;低载时转速对材料的摩擦学性能影响不大,高载时材料的摩擦因数和磨损率都随转速的增大先增后降;PTW的添加增加了复合材料表面硬度,能够有效防止复合材料与对偶件产生黏着;在低速或者轻载时,HDPE复合材料的磨损机制为犁沟磨损和疲劳磨损,载荷或转速增大后开始发生黏着磨损,载荷或转速进一步增大将产生塑性流动;高温引起的塑性流动填补了摩擦表面的微裂纹,阻止了疲劳裂纹的扩张并起到了润滑的作用,减小了摩擦因数,高速低载时磨损率下降,高载低速时磨损率上升。
In order to improve the mechanical properties,self-lubrication and wear resistance of high density polyethylene(HDPE),HDPE composite was prepared by filling potassium hexatitanate whisker(PTW),polytetrafluoroethylene(PTFE)and talc powder with HDPE as matrix.The friction coefficient and wear rate of the composite under different loads and speeds were tested on MMW-1 friction and wear tester.The wear morphology of the composite was analyzed by scanning electron microscope(SEM),and the friction and wear characteristics of HDPE composite were discussed.The results show that the load has a significant effect on the friction coefficient and wear rate of HDPE composite.When the load increases,the friction coefficient of HDPE composite decreases,and the wear rate increases.The friction coefficient and wear rate of the material increase first and then decrease with the increase of the speed at high load.The addition of PTW increases the surface hardness of the HDPE composite and can effectively prevent the adhesion between the composite and the rubbing pair.At low speed or light load,the wear mechanism of the HDPE composite is furrow wear and fatigue wear.When the load or speed increases,adhesion wear begins to occur,and plastic flow will occur when the load or speed increases further.The plastic flow caused by high temperature fills in the micro cracks on the friction surface,prevents the expansion of fatigue cracks and plays the role of lubrication,which can reduce the friction coefficient,decrease the wear rate at high speed and low load,while increase the wear rate at high load and low speed.
作者
周卓
龙春光
闵建新
黎帅
ZHOU Zhuo;LONG Chunguang;MIN Jianxin;LI Shuai(Institute of Lightweight New Materials,Changsha University of Science and Technology,Changsha Hunan 410004,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2022年第2期69-74,共6页
Lubrication Engineering
基金
国家科技部国际合作专项基金项目(0102013DFG52800)。
