摘要
45钢材料用于发动机核心零部件难以满足耐磨减摩的要求,需对其表面进行有效改性满足摩擦学性能。以45钢为基体,磷酸二氢铝(Al(H_(2)PO_(4))_(3))为胶黏剂、聚四氟乙烯(PTFE)作为润滑增强相,采用料浆法制备金属基陶瓷涂层。通过改变金属基陶瓷涂层的化学组分,采取阶段式升温固化方式获得6组金属基陶瓷涂层,并利用X射线衍射分析仪(XRD)、扫描电子显微镜(SEM)和NST型划痕测试仪分别测试其物相组成、微观表面形貌和涂层界面结合强度和摩擦学性能。研究表明:PTFE增强金属基陶瓷涂层的物相包括未完全反应的Al2O3和ZnO、不发生反应的PTFE以及反应生成的AlPO_(4)和Zn_(3)(PO_(4))_(2);随PTFE质量分数增加,金属基陶瓷涂层组织结构改善、涂层界面结合强度增大、摩擦学性能提升。PTFE最佳添加量为0.8%(质量分数),此时陶瓷涂层表面几乎没有裂纹呈现,只存在孔隙缺陷;涂层结合强度将从6.52 N增至8.43 N,摩擦因数从0.483降低至0.313。因此,PTFE作为润滑增强相可优化金属基陶瓷涂层摩擦学行为,同时提高涂层的力学性能。
45 steel materials are difficult to meet the requirements for wear resistance and friction reduction in engine critical components,necessitating effective surface modification to achieve desired tribological properties.Using 45 steel as the substrate,aluminum dihydrogen phosphate(Al(H_(2)PO_(4))_(3))as the adhesive,and polytetrafluoroethylene(PTFE)as lubricant,a metal matrix ceramic coating was prepared via the slurry method.By modifying the chemical composition of the metal matrix ceramic coating and employing a staged heating curing process,six kinds of metal matrix ceramic coatings were obtained.The phase composition,microscopic surface morphology,interfacial bonding strength,and tribological properties of the coatings were analyzed using an X-ray diffraction analyzer(XRD),scanning electron microscope(SEM),and an NST-type scratch tester.The results show that the phases of the PTFE-enhanced metal matrix ceramic coating include unreacted Al 2O 3 and ZnO,non-reactive PTFE,and reaction products such as AlPO_(4) and Zn_(3)(PO_(4))_(2).As the mass fraction of PTFE increases,the microstructure of the metal matrix ceramic coating improves,the interfacial bonding strength increases,and the tribological properties are enhanced.The optimal addition amount of PTFE is 0.8%(mass fraction),at which point the ceramic coating surface exhibits almost no cracks and only porosity defects.The interfacial bonding strength increases from 6.52 N to 8.43 N,and the friction coefficient decreases from 0.483 to 0.313.Therefore,PTFE,as a lubrication-enhancing phase,can optimize the tribological behavior of metal matrix ceramic coatings while improving the mechanical properties of the coating.
作者
朱玉广
王子睿
申伟杰
钮市伟
王永光
黄冬梅
ZHU Yuguang;WANG Zirui;SHEN Weijie;NIU Shiwei;WANG Yongguang;HUANG Dongmei(Engineering Training Center,Soochow University,Suzhou Jiangsu 215006,China;School of Mechanical and Electric Engineering,Soochow University,Suzhou Jiangsu 215006,China;Suzhou Jiangjin Automation Technology Co.,Ltd.,Suzhou Jiangsu 215100,China)
出处
《润滑与密封》
北大核心
2025年第10期151-157,共7页
Lubrication Engineering
基金
国家自然科学基金项目面上项目(52375458)。
关键词
金属基陶瓷涂层
聚四氟乙烯
磷酸二氢铝
料浆法
摩擦学行为
metal matrix ceramic coatings
polytetrafluoroethylene
aluminum dihydrogen phosphate
slurry method
tribological behavior
