咸水对UHMWPE材料摩擦性能影响及微观分析

为研究超高分子量聚乙烯材料在咸水输送过程中的摩擦性能以及微观动态,采用CFT-I型材料表面性能综合测试仪在干摩擦、纯水润滑、咸水润滑3种不同摩擦环境下对UHMWPE材料试样进行旋转摩擦,通过扫描电子显微镜以及表面轮廓仪分析了转速为500 r/min,荷载为50 N,历时为25 min;转速为500 r/min,历时为10 min,荷载为30,50,70,90,110 N;荷载为50 N,历时为10 min,转速为300,500,700,900,1 100 r/min等变量因素对UHMWPE摩擦磨损性能的影响规律,以及咸水润滑过程中颗粒的微观运动形态.结果表明:咸水润滑下UHMWPE磨损机制主要为磨粒磨损,其摩擦系数以及磨损量均小于干摩擦、纯水润滑,摩擦系数随着荷载以及转速的增大呈现先增大后减小的规律,且随时间的延长呈现下降趋势.咸水润滑在摩擦过程中形成减磨性能强的润滑膜并且析出起到滚珠作用的盐结晶颗粒,可减少UHMWPE在咸水输送中的磨耗,为UHMWPE材料在咸水环境下的应用提供了理论基础.

Effect of salt water on friction properties and microstructure analysis of UHMWPE

In order to study the friction performance and the micro dynamics of ultra-high molecular weight polyethylene(UHMWPE)pipe in the salt water transport process,the CFT-I material surface performance comprehensive test instrument to the rotating friction on UHMWPE material specimen was applied under three different conditions of dry friction,water lubrication and salt water lubrication respectively.Then the regularity of the influence of the properties on UHMWPE friction and wear particles in the process of the salt water lubrication and the microscopic movement form by the scanning electron microscope and surface contourgraph was applied under variable factors,such as the speed of 500 r/min,load of 50 N,and lasting for 25 min;the speed of 500 r/min,lasting for 10 min,and the load of 30 N,50 N,70 N,90 N and 110 N;load of 50 N,lasting for 10 min,and the speed of 300 r/min,500 r/min,700 r/min,900 r/min and 1100 r/min.Results show that UHMWPE wear mechanisms are mainly abrasive wear under the salt water lubrication,the friction coefficient and wear quantity in salty lubrication are minimal compared with those under the dry friction and water lubrication,and the friction coefficient increases first and then decreases with the increase of load and speed,pre-senting downtrend with the time extension.Salt water lubricant in the friction process can form strong antifriction performance of lubricant film as well as salt water crystallization particles which play the ball role,reducing can reduce the UHMWPE wear in salt water delivery,and making a theoretical basis for the application of UHMWPE in salt water environment.