碳纳米管-碳纤维增强二硫化钨/聚酰胺酰亚胺复合涂层摩擦学性能研究  

Tribological Properties of Carbon Nanotubes-Carbon Fiber Reinforced WS2/PAI Composite Coatings

作　　者：赵鼎元 刘思思[1] 廖君慧 傅兵 刘金刚[1] ZHAO Dingyuan;LIU Sisi;LIAO Junhui;FU Bing;LIU Jingang(School of Mechanical Engineering and Mechanics,Xiangtan University,Hunan Xiangtan 411105,China;Hunan Jiangbin Machinery(Group)Company Limited,Hunan Xiangtan 411100,China)

机构地区：[1]湘潭大学机械工程与力学学院,湖南湘潭411105 [2]湖南江滨机器(集团)有限责任公司,湖南湘潭411100

出　　处：《摩擦学学报（中英文）》2024年第8期1125-1135,共11页Tribology

基　　金：国家自然科学基金项目(52175191);湖南省自然科学基金项目(2023JJ50238);湖南省青年科技人才项目(2022RC1133);装备预研教育部联合基金(8091B030123);湖南省制造业关键产品“揭榜挂帅”项目(2023GXGG001,2023GXGG018)资助。

摘　　要：通过稀土接枝方法将碳纳米管(CNTs)接枝在碳纤维(CF)表面,得到碳纳米管-碳纤维(CNTs-CF)多尺度增强体;以聚酰胺酰亚胺(PAI)为粘结剂,二硫化钨(WS_(2))为固体润滑填料,制备了二硫化钨/聚酰胺酰亚胺(WS_(2)/PAI)复合涂料.在WS_(2)/PAI复合涂料中添加CNTs-CF,涂覆在铝合金样块表面形成碳纳米管-碳纤维增强二硫化钨/聚酰胺酰亚胺(CNTs-CF/WS_(2)/PAI)复合涂层.采用X射线光电子能谱(XPS)、拉曼光谱(Raman spectra)和扫描电子显微镜(SEM)对CNTs-CF粉末进行表征;采用CFT-Ⅰ型材料表面性能综合测试仪和VH-2000C型超景深三维显微系统测试分析了不同试验条件下CNTs-CF对WS_(2)/PAI复合涂层摩擦学性能的影响.试验表明:在WS_(2)/PAI复合涂层中添加适量CNTs-CF能显著提高涂层材料的结合强度和耐磨性能,并一定程度上改善涂层的润滑效果.当CNTs-CF的质量分数为1.5%时,涂层的耐磨减摩性能最佳,在不同载荷下均表现出较低的摩擦系数和磨损率.CNTs-CF/WS_(2)/PAI复合涂层优异的摩擦学性能主要归因于WS_(2)的润滑作用、稀土Ce的桥接作用和CNTs-CF的增强作用.In this study,carbon nanotubes-carbon fiber(CNTs-CF)multiscale reinforcements were prepared by grafting carbon nanotubes(CNTs)onto the surface of carbon fibers(CF)through a rare-earth grafting method.The CeCl3 modified CF(RCF)was obtained by the same preparation method without adding CNTs.TheWS_(2)/PAI composite coating was prepared with polyamideimide(PAI)as binder and WS_(2) as solid lubricant filler.The CNTs-CF was added to the WS_(2)/PAI composite coating at mass fractions of 0.0%,0.5%,1.0%,1.5%and 2.0%respectively.The WS_(2)/PAI composite coating with CNT-CF was coated on the surface of the aluminum alloy sample and formed the CNTCF/WS_(2)/PAI composite coating.In addition,in order to study the reinforcement mechanism of CNTs-CF,the WS_(2)/PAI composite coatings adding CF and RCF were prepared,which was denoted as CF/WS_(2)/PAI and RCF/WS_(2)/PAI.In order to confirm whether the preparation of CNTs-CF was successful,the morphology and structure of CNTs-CF were characterized by X-ray photoelectron spectroscopy(XPS),Raman spectra,and scanning electron microscope(SEM).The microhardness of the coating was measured using a micro-Vickers hardness tester.The tribological properties of CNTs-CF on the tribological properties of WS_(2)/PAI composite coating was tested under different experimental conditions by using a friction and wear tester and an ultra-depth 3D microscope.The experimental results showed that since rare earth elements had a large coordination number and extremely high chemical activity,the oxygen and nitrogen on the CF surface would react with cerium,causing more oxygen-containing functional groups to exist on the CF surface.There was an obvious characteristic peak of Ce-O at 530.46 eV,indicating that cerium formed a chemical bond with oxygen to adsorb CNTs on the CF surface.Raman spectroscopy showed that the degree of graphitization of CNTs-CF was higher than that of carbon fiber.This was because the degree of graphitization of CNTs was high.The results of the microhardness test showed that the CNTs

关 键 词：碳纳米管 碳纤维 二硫化钨 复合涂层 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论]