固液双相作用下多孔自润滑表面渗流行为分析  

Seepage Behavior Analysis of Porous Self-Lubricating Surface under Solid-Liquid Two-Phase Action

作　　者：张国涛 马镇 童宝宏[1,2] 焦云龙[3] 尹延国[3] 刘焜[3] ZHANG Guotao;MA Zhen;TONG Baohong;JIAO Yunlong;YIN Yanguo;LIU Kun(l.Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Anhui Ma'anshan 243002,China;School of Mechanical Engineering,Anhui University of Technology,Anhui Ma'anshan 243002,China;Institute of Tribology,Hefei University of Technology,Anhui Hefei 230009,China)

机构地区：[1]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002 [2]安徽工业大学机械工程学院,安徽马鞍山243002 [3]合肥工业大学摩擦学研究所,安徽合肥230009

出　　处：《摩擦学学报》2023年第2期220-228,共9页Tribology

基　　金：国家自然科学基金项目(52005005,51975005,51975174);先进金属材料绿色制备与表面技术教育部重点实验室开放基金(GFST2020KF08)资助。

摘　　要：以多孔自润滑材料为研究对象,分析载荷作用下多孔基体变形和润滑液在孔隙中的流动特性,探讨多孔表面渗流速度随加载时间变化,分析固-液双相作用下多孔表面渗流与润滑行为.结果表明,多孔基体变形后,孔隙内储存的润滑液受迫流动,在多孔表面发生渗入和析出的流动现象.润滑液在接触区向多孔基体渗入,在接触区入口向多孔表面析出.恒定载荷下,入口两侧润滑液不能保持稳定的渗流现象,而随加载时间呈现出扩散和波动的变化过程.在竖直方向上,多孔材料内的最大流体压力发生在上表面,最大固相应力发生在靠近上表面的次表面位置.随加载时间延长,磨擦界面的液相承载力先增大后降低,固相承载力先降低后增大,最终液相承载力降低为零,外载荷全部由固相材料承担.适当增加载荷能提高润滑液在多孔表面上的渗流速度,改善润滑状态,但也使得润滑液的渗流速度波动更为剧烈.Porous self-lubricating materials are widely used in advanced lubrication technologies, such as porous bearings, gears prepared by powder metallurgy, and bionic self-lubricating materials, due to their self-lubricating properties. The seepage behavior of lubricating fluid on porous surfaces has an important impact on the quality of surface lubrication. Unfortunately, the existing research does not pay enough attention to this topic, and the complex solid-liquid two-phase coupling mechanism is still unclear. In this paper, the porous self-lubricating materials were taken as the research object for analyzing the deformation of porous matrix and the flow characteristics of lubricating liquid in porous matrix under the effect of the external load. The change of seepage velocity with loading time on the porous surface was discussed. The seepage and lubrication behavior of porous surfaces under solid-liquid dual-phase action were studied. The results showed that the porous matrix was deformed under load. The lubricating fluid stored in the pores was forced to flow, and the flow behavior of infiltration and precipitation occurred on the porous surface. The lubricating fluid penetrated into the porous matrix in the contact area and precipitated out to the porous surface at the entrance of the contact area. Under a constant load, the lubricating fluid on both sides of the inlet did not maintain a stable seepage phenomenon, but showed a process of diffusion, fluctuation, and stability finally with the loading time. In the vertical direction in the porous material, the maximum fluid pressure occurred on the upper surface, and the maximum solid force occurred at the subsurface close to the upper surface. On the porous surface, the solid stress and fluid pressure were symmetrically distributed along the y-axis, and the solid stress and fluid pressure were the largest in the center of the contact area. After long-time loading, the solid stress distribution on the porous surface was similar to the analytical solution of the tra

关 键 词：多孔表面 自润滑 渗流 变形 载荷 

分 类 号：TH117.2[机械工程—机械设计及理论]