稀土处理玻璃纤维填充聚四氟乙烯复合材料在油润滑下的摩擦学性能

分别用偶联剂、稀土以及偶联剂 -稀土混合物处理玻璃纤维表面 ,以改善玻璃纤维与聚四氟乙烯之间的界面结合力 ,考察了玻璃纤维填充聚四氟乙烯复合材料在油润滑下的摩擦学性能 .结果表明 :在油润滑条件下 ,表面处理玻璃纤维填充聚四氟乙烯复合材料的摩擦系数比未经处理玻璃纤维填充聚四氟乙烯复合材料的低 ,耐磨性亦较优 ;而稀土处理玻璃纤维填充聚四氟乙烯复合材料具有最低的摩擦系数及最高的耐磨性和极限 pv值 ;未经处理玻璃纤维填充聚四氟乙烯复合材料的磨损形式主要为粘着转移 ,偶联剂处理玻璃纤维填充聚四氟乙烯复合材料和偶联剂与稀土处理玻璃纤维填充聚四氟乙烯复合材料均以磨粒磨损为主 ,而稀土处理玻璃纤维填充聚四氟乙烯复合材料的磨损机理主要为粘着磨损和轻微磨粒磨损

Tribological Properties of Polytetrafluroethylene Composites Filled with Rare Earth-modified Glass Fiber under Oil Lubrication

A coupling agent, rare earths, and a mixture of coupling agent with rare earths, were used to modify the surface of glass fiber, in an attempt to improve the interfacial adhesion between the glass fiber and polytetrafluroethylene (PTFE) matrix. The friction and wear behavior and the limiting pv values of the PTFE composites filled with the surface modified or unmodified glass fibers in oil lubricated sliding against steel were investigated with an MPV 20 friction and wear test rig. The wear mechanisms of the composites were analyzed based on morphological observation of the worn surfaces with a scanning electron microscope. The results show that the PTFE composites filled with surface modified glass fiber record lower friction coefficients and better wear resistance than those filled with the unmodified glass fiber, under the oil lubricated condition. The PTFE composite filled with rare earth modified glass fiber exhibits the lowest friction coefficient and the highest wear resistance as well as limiting pv values. This is attributed to the improvement of the interfacial adhesion between the surface modified glass fiber and the PTFE matrix. The composite filled with unmodified glass fiber is characterized by adhesion and transfer in sliding against the steel, those filled with the coupling agent modified glass fiber and with coupling agent and rare earth modified glass fiber are characterized by abrasive wear, while the PTFE composite filled with rare earth modified glass fiber by adhesion wear and slight abrasive wear.