【摘要】 为改善碳纤维表面活性,提高碳纤维增强聚酰亚胺复合材料的综合性能,分别采用稀土改性剂和空气氧化处理方法对碳纤维表面进行改性处理,研究了在干摩擦条件下载荷、往复滑动频率以及不同改性处理方法对碳纤维/聚酰亚胺复合材料的摩擦磨损性能的影响.结果表明:碳纤维表面改性处理能够提高碳纤维/聚酰亚胺复合材料的摩擦磨损性能;在干摩擦条件下,未处理与空气氧化处理的复合材料摩擦系数和磨损量均随载荷和往复滑动频率的上升而显著上升;与空气氧化改性处理相比,稀土改性处理能够有效地改善碳纤维与聚酰亚胺树脂基体之间的界面结合性能,在相同的试验条件下,经过稀土处理的碳纤维/聚酰亚胺复合材料的摩擦磨损性能最优.更多还原

【Abstract】 In order to improve carbon fiber surface activity and comprehensive properties of the carbon fiber reinforced polyimide(CF/PI),rare earth solution(RES) surface modification and air-oxidation methods were used to improve the interfacial adhesion of CF/PI composite.The tribological property of the PI composites reinforced by the carbon fibers treated with different loads,reciprocating sliding frequency and surface modification methods were comparatively investigated.Results show that surface mo-dification of CF can improve friction and wear behavior of CF/PI composite.Friction coefficient,wear untreated CF/PI composite and air-oxitation CF/PI composite significantly increase with the increase of load and sliding frequency under dry sliding condition.Rare earth elements acting as surface modifier of the carbon fibers can increase interfacial adhesion and toughness between carbon fibers and PI matrix,and can improve tribological performance of the composites.In the same test conditions,the friction and wear properties of the RES treated CF/PI composite are optimal.更多还原