水润滑条件下氧化锆颗粒及碳纤维共混增强聚醚醚酮复合材料的摩擦性能研究  

Study on the Tribological Properties of Polyetheretherketone Composites Reinforced by ZrO_2 Particles and Short Carbon Fibers under Water Lubrication

作　　者：钟莹洁[1] 谢光有[1] 孙兆松[1] 隋国鑫[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016

出　　处：《材料研究学报》2010年第6期625-630,共6页Chinese Journal of Materials Research

摘　　要：通过熔融共混法制备了碳纤维(CF)和氧化锆颗粒(ZrO_2)共混增强聚醚醚酮(PEEK)复合材料,并对其水中的摩擦学性能进行了研究。实验结果表明,该混杂增强复合材料在水中具有优异的摩擦学性能,其摩擦系数随载荷的增加无明显变化,而磨损率则随着载荷的增加而逐渐降低。该材料在水中的磨损机制主要表现为轻微的磨粒磨损和疲劳磨损,碳纤维是复合材料耐磨性得到增强的主要原因,其作为复合材料摩擦面表层的主要承载相,承担了两摩擦面之间的大部分载荷,并保护聚合物基体免于受到对磨副的严重磨损。氧化锆颗粒的加入则有效抑制了摩擦过程中碳纤维的破损与脱落,从而使得混杂增强PEEK复合材料比单纯碳纤维增强的PEEK复合材料具有更加优异的耐磨性能。但过多颗粒的加入会加剧疲劳磨损,从而降低材料的耐磨性。PEEK matrix composites filled with short carbon fibers（CF） and ZrO_2 particles were compounded using a twin-screw extruder followed by injection molding.The tribological properties of the PEEK/CF/ZrO_2 composites under the water lubrication were systematically studied.It was revealed that the hybrid composites exhibit excellent wear-resistance in the water conditions.The friction coefficients of the composites slightly changed with increasing of the applied load,while the wear rates of the hybrid composites decreased with increasing applied load.Main wear mechanism of the composites in water was mild abrasive wear and fatigue wear.The high wear resistance of the composites should be attributed to the existence of the carbon fibers：the carbon fibers carried the main load between the contact surfaces and protected the soft polymer matrix from further severe impact and abrasion of the counterpart.The incorporation of the ZrO_2 particles could effectively inhibit the carbon fiber failure and debonding,which resulted in a better wear resistance property of the hybrid PEEK composites compared with sole CF reinforced PEEK composites.However,high loading of the particles would also aggravate the fatigue wear of the composites and lead to a deterioration of the wear resistance of the composites.

关 键 词：复合材料 聚醚醚酮 摩擦磨损 混杂增强 碳纤维 水润滑 

分 类 号：TB332[一般工业技术—材料科学与工程]