改性碳纤维-MoS_(2)复合涂层的高温摩擦学性能研究  

High Temperature Tribological Properties of Modified CF in MoS_(2) Composite Coating

作　　者：高阳[1] 刘思思[1] 廖君慧 赵鼎元 刘金刚[1] GAO Yang;LIU Sisi;LIAO Junhui;ZHAO Dingyuan;LIU Jingang(School of Mechanical Engineering,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4期482-493,共12页Tribology

基　　金：国家自然科学基金项目(52175191);湖南省青年科技人才项目(2022RC1133);湖南省教育厅优秀青年项目(21B0118)和湖南省教育厅重点项目(22A0104)资助。

摘　　要：为了改善高温下固体润滑复合涂层的稳定性,选择经过化学改性的纳米碳纤维对MoS_(2)涂料进行性能优化,制备添加不同比例的改性粉末的涂料.通过对粉末进行XPS、红外和形貌分析,表明碳纤维已经改性.借助CFT-I型高速往复摩擦磨损试验机分别在不同温度条件下进行摩擦试验,利用超景深显微系统对不同条件涂层表面磨损的形貌进行观测,对磨损机理进行分析,探究添加量的最优比例.试验结果表明:在试验温度分别为20、50和100℃时,添加质量分数1.5%CF-GO(氧化石墨烯改性碳纤维)涂料制备的涂层耐磨性能均优于其他的添加比例的涂层.在干摩擦5 N载荷,试验温度为200℃时,添加质量分数1.5%CF-GO的涂层比未改性的涂层的磨痕深度、宽度分别减少66.1%、29.2%,涂层的耐磨性能有了很大的提高,进一步采用扫描电子显微镜(SEM)分析涂层的内部形貌可知,添加质量分数1.5%的CF-GO时,涂层内部形成清晰的网状结构,从而使得该比例下的涂层同时具有抗高温变形、耐磨以及耐热等优异的性能.After the CF was acidified,the fiber surface was silanized with KH550,and the carbon fiber powder after the GO and silanized treatment was poured into DMF solution.Finally,the GO was chemically grafted on the CF surface,which was denoted as CF-GO.CF-GO was added into MoS_(2) coating according to the mass fraction of 0.0%,0.5%,1.0%,1.5%and 2.0%,respectively,to prepare coatings of different proportions.With the help of CFT-Ⅰhigh-speed reciprocating friction and wear testing machine,and other conditions unchanged,the friction and wear experiments were carried out on five kinds of coatings under different addition ratios at the matrix temperatures of 20,50,100 and 200℃,respectively.Meanwhile,the surface wear morphology data of the coatings under different conditions were observed by the ultra-depth of field microscopic system.The wear mechanism of the coating was further analyzed by SEM,and the influence of temperature and the proportion of modified powder on the wear resistance and heat resistance of the coating was explored.The experimental results showed that:after infrared analysis of modified powder CF-GO,it was found that a secondary amide N-H characteristic peak appeared at 3243 cm−1 on its surface,which was the amidation reaction between the amino group on the surface of carbon fiber after silanization and the carboxy group on the surface of GO to form an amide bond.The characteristic peak of C=C appeared at 1628 cm−1 and the characteristic peak of Si-O-C appeared at 1125 cm−1.XPS analysis showed that CF had different types and contents of elements at different stages,because different chemical treatments would change the types and contents of elements on CF surface.Finally,scanning electron microscopy was used to observe the morphology of CF before and after modification,and it was found that compared with the original CF,sheets of GO appeared on the surface of the modified CF.All these indicated that GO had been chemically grafted on carbon fiber.After testing the binding strength of the coating a

关 键 词：改性碳纤维 二硫化钼 复合涂层 高温变形 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论] TG115.58[金属学及工艺—物理冶金]