非晶合金粉末作为润滑油添加剂的摩擦学性能  

Tribological Properties of Polyalphaolefin(PAO6) Lubricant Modified with Particles Additives of Metallic Glass

作　　者：毕甲紫 刘晓斌 李然[1] 张涛[1] BI Jiazi;LIU Xiaobin;LI Ran;ZHANG Tao(School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《金属学报》2021年第4期559-566,共8页Acta Metallurgica Sinica

基　　金：国家重点研发计划项目No.2018YFA0703600;国家自然科学基金项目Nos.51771008、51971006和51131002;中央高校基本科研业务费专项资金项目No.YWF-20-BJ-J-513。

摘　　要：采用水雾化法制备得到了超细Mn_(55)Fe_(25)P_(10)B_(7)C_(3)非晶合金粉末,将其作为润滑油添加剂以不同含量加入到PAO6基础油中,利用四球摩擦实验系统评估了粉末添加前后润滑油的摩擦系数、对磨球的磨斑尺寸、表面形貌和表面粗糙度等,从而对比获得了该类非晶合金粉末添加对PAO6基础油摩擦学性能的影响。结果表明,水雾化合金粉末的颗粒呈近球形,筛分过1000目的粉末(中位粒径为2.8μm)为完全非晶态,且有高占比的亚微米粉末(直径在1μm以下的颗粒数目约占12%);在PAO6润滑油中添加适量该类具有高硬弹比(H/E)且与摩擦副的模量相接近的超细非晶合金粉末后,其摩擦系数与磨斑直径均显著降低,最大降幅分别可达57.1%和15.6%(对应添加0.5%(质量分数)的非晶粉末时),说明该类非晶粉末润滑油添加剂具有良好的降低摩擦系数和减磨效果;观察对比测试后磨球表面的形貌和粗糙度表明:该类非晶粉末在磨球表面可以产生明显的碾抹效应,从而提高了基础油的减摩和抗磨性能。In mechanical systems, friction and wear lead to energy loss and machine failure. Lubricants are widely used to minimize friction and wear between moving components. Additives in lubricants significantly improve the quality of the lubricants. In recent years, nanoparticles have started to play more important roles as lubricant additives because of their ability to minimize friction and wear reduction. Despite the advantages of nanoparticles as additives, there are also some challenges to their applications.The most significant challenge is that because of the strong van der Waals force, nanoparticles aggregate in solutions. In addition, their complex process of preparation and high costs limit application in large-scale fields. Metallic glasses(MGs) with long-range disorder structure exhibit novel physical and chemical properties, e.g., high strength and hardness, high elastic limitation, high hardness/elasticity ratio, which make them potentially suitable for use as additives for lubricants. This work presents the tribological properties of friction and wear behaviors of polyalphaolefin(PAO6) oil modified with Mn_(55)Fe_(25)P_(10)B_(7)C_(3) MG particles at different concentrations(0~0.5%, mass fraction). Four ball tests were performed with an MMW-1A tribotester, XRD was used to examine the structure of the prepared Mn-based powders, SEM was used to observe morphologies of Mn55Fe25P10B7C3 particles and worn surfaces;OM was used to measure the wear scar diameters(WSD) and its roughness was measured with a white light interferometer(WLI). The results show a significant decrease of up to 57.1% and 15.6% for the coefficient of friction(COF) and WSD, respectively, as the addition of 0.5% MG particles in PAO6. The addition of MG particles leads to a decrease of worn surface roughness. With a high hardness/elasticity ratio and similar modulus to the friction pairs, the MG particles show a"smearing-type"wear mechanism, thus enhancing the antifriction and antiwear performance of PAO6 lubricants.

关 键 词：超细非晶粉末 非晶合金 润滑油添加剂 摩擦 磨损 

分 类 号：TG139[一般工业技术—材料科学与工程]