二维层状Ni/β-Ni(OH)2纳米复合材料的制备及其摩擦学性能研究  

Preparation and Tribological Properties of Two-dimensional Layered Ni/β-Ni(OH)2 Nanocomposite

作　　者：刘超林 苏峰华[1] 李助军[2] LIU Chaolin;SU Fenghua;LI Zhujun(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou Guangdong 510641,China;School of Mechanical and Electrical Engineering,Guangzhou Railway Polytechnic,Guangzhou Guangdong 510430,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641 [2]广州铁路职业技术学院机械与电子学院,广东广州510430

出　　处：《润滑与密封》2020年第3期33-37,50,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(51775191);中央高校科研业务费重点项目(2018ZD29).

摘　　要：采用水热反应制备出β-Ni(OH)2,然后通过水热还原得到Ni/β-Ni(OH)2纳米复合粉体材料,采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对复合材料的相结构、成分及形貌进行表征分析。采用四球摩擦磨损试验机评价制备的Ni/β-Ni(OH)2作为润滑油添加剂的摩擦学性能,基础油为PAO6。摩擦试验后,采用SEM分析典型试验钢球磨斑的表面形貌,利用能谱仪(EDS)研究磨斑表面化学元素的组成,探讨Ni/β-Ni(OH)2纳米复合润滑添加剂的减摩抗磨机制。结果表明:Ni/β-Ni(OH)2纳米复合材料作为润滑添加剂具有极好的减摩抗磨性能,显著优于基础油PAO6和未负载纳米Ni的二维β-Ni(OH)2层状材料;与基础油相比,添加0.1%质量分数Ni/β-Ni(OH)2添加剂的油样的摩擦因数和磨斑直径分别降低了17.6%和41.5%;Ni/β-Ni(OH)2纳米复合粉体综合了纳米Ni及层状β-Ni(OH)2两部分结构特性,在摩擦过程中,复合材料中的纳米金属粒子Ni与层状结构材料β-Ni(OH)2能够相互增强起到协同润滑作用。β-Ni(OH)2 was prepared by hydrothermal reaction,and then by hydrothermal reduction,Ni/β-Ni(OH)2 nanocomposite was obtained.The phase structure,morphology and chemical composition of the as-prepared nanocomposites were characterized by XRD and SEM.The friction and wear properties of the nanocomposite as lubricant additive in PAO6 based oil were evaluated by a four-ball tribo-meter.After tribo-test,the surface morphology and chemical composition of the wear surfaces on the contact steel balls were analyzed by SEM and energy dispersive spectrometer(EDS)to illustrate the anti-wear and friction-reducing mechanism of the resulting Ni/β-Ni(OH)2 additive.The results show that Ni/β-Ni(OH)2 nanocomposite as lubricant additive exhibits superior anti-wear and friction-reducing ability.The tribological properties of the oil dispersed with Ni/β-Ni(OH)2 nanocomposite are much better than that of the based oil and the oil dispersed withβ-Ni(OH)2.The friction coefficient and wear scar diameter of the oil dispersed with 0.1%Ni/β-Ni(OH)2 are reduced by 17.6%and 41.5%respectively,as compared to the PAO6 oil.The superior tribological properties of Ni/β-Ni(OH)2 are ascribed to the special composite structure from the nanocomposite,the nano-Ni and layeredβ-Ni(OH)2,which leads to synergistic lubricating action produced between nano-Ni andβ-Ni(OH)2.

关 键 词：二维纳米复合材料 Ni/β-Ni(OH)2 摩擦磨损性能 协同润滑机制 

分 类 号：TH117.1[机械工程—机械设计及理论]