董绍江,程伟伦,胡小林,徐向阳,潘雪娇.空间滚动轴承MoS2薄膜三体接触摩擦分析[J].表面技术,2023,52(12):343-350, 368.
DONG Shao-jiang,CHENG Wei-lun,HU Xiao-lin,XU Xiang-yang,PAN Xue-jiao.Three-body Contact Friction of MoS2 Thin Films in Space Rolling Bearings[J].Surface Technology,2023,52(12):343-350, 368 |
| 空间滚动轴承MoS2薄膜三体接触摩擦分析 |
| Three-body Contact Friction of MoS2 Thin Films in Space Rolling Bearings |
| 投稿时间：2022-10-12 修订日期：2023-04-12 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.12.028 |
| 中文关键词: 二硫化钼 三体接触摩擦 两体接触摩擦 分子动力学仿真 磨损 摩擦 |
| 英文关键词:molybdenum disulfide three-body contact friction two-body contact friction molecular dynamics simulation wear friction |
| 基金项目:国家自然科学基金(51775072);重庆市科技创新领军人才支持计划项目(CSTCCCXLJRC201920);重庆市高校创新研究群体(CXQT20019);重庆市北碚区科学技术局技术创新与应用示范项目(2020-5);重庆交通大学研究生科研创新项目(CYS22414) |
|
|
| Author | Institution |
| DONG Shao-jiang | School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University,Chongqing 400074, China |
| CHENG Wei-lun | School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University,Chongqing 400074, China |
| HU Xiao-lin | Chongqing Industrial Big Data Innovation Center Co., Ltd., Chongqing 400707, China |
| XU Xiang-yang | School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University,Chongqing 400074, China |
| PAN Xue-jiao | School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University,Chongqing 400074, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 针对太空尘导致的固体润滑轴承失效机理难以揭示的问题，提出采用分子动力模拟的方法，从原子尺度对空间滚动轴承二硫化钼(MoS2)润滑薄膜的摩擦特性进行研究。方法 首先建立MoS2薄膜的原子模型，在此基础上，根据实际场景，将MoS2薄膜的摩擦接触条件分为两体和三体接触。其次，通过对比两体和三体接触的摩擦结果，探究三体接触条件下MoS2薄膜的摩擦磨损机理。最后，通过改变基底结构，探究粗糙基底对MoS2薄膜三体接触磨损的影响。结果 三体接触对薄膜的磨损和摩擦系数均小于两体接触。在相同的滑移速度下，磨料的自旋速度越快，摩擦系数越低，但薄膜上出现的损伤越多。三体接触条件下，基底的粗糙表面不利于薄膜吸附，并且加快了薄膜的磨损。结论 三体与两体接触的摩擦磨损机理不同。三体接触摩擦过程中，薄膜表面不会出现犁削现象进而造成薄膜的撕裂。原子尺度下，摩擦过程中磨料的自旋作用削弱了薄膜表面切向力的积累，从而有效减小了摩擦力，减少了薄膜磨损。在保持磨料滑移速度不变的情况下，磨料的自旋速度会对薄膜的摩擦和磨损产生影响。在三体接触摩擦过程中，粗糙基底上的微凸结构阻碍薄膜运动，增大了摩擦力，薄膜与基底接触面积的减少削弱了基底与薄膜的吸附性。 |
| 英文摘要: |
| Because of the weightless environment of space, space dust can easily enter the spacecraft. In the long time running, the friction pair will produce debris. Space dust and debris can affect mechanical lubrication. It is difficult to reveal the failure mechanism of solid lubricated bearings caused by space dust and debris. The friction characteristics of MoS2 (molybdenum disulfide) lubricated film of space rolling bearing were studied by molecular dynamic simulation. Fe-Ni-Cr alloy was used as the reference bearing material in the simulation to explore the interaction between the film and the substrate. Firstly, the atomic model of MoS2 film and Fe-Ni-Cr alloy was established. Based on this, the friction contact conditions of MoS2 film were divided into two-body contact and three-body contact according to the actual scene. Secondly, the friction and wear mechanism of MoS2 film under three-body contact condition was explored by comparing the friction results of two-body contact and three-body contact. Finally, the effect of rough substrate on three-body contact wear of MoS2 film was explored by changing the substrate structure. For the surface,under the condition of two-body contact, the abrasive particles will tear the film, and the ploughing phenomenon will appear under the action of load. Under the condition of three-body contact, there is no tearing or ploughing phenomenon on the surface of the film. The wear of three-body contact is less than that of two-body contact. The friction coefficient of three-body contact is less than that of two-body contact. Under the condition of three-body contact, the rough surface of the substrate is not conducive to the adsorption of thin films and accelerates the wear of thin films. The effect of load on the adsorption of rough substrate and thin film is obvious. When the load exceeds 300 nN, the adsorption energy of rough substrate and thin film will change abruptly. The friction and wear mechanism of three-body contact is different from that of two-body contact. Under the condition of two-body contact, the abrasive particles lead to sliding friction. During the process of motion, the abrasive particles accumulate and release tangential force on the surface of the film (stick-slip phenomenon). When the accumulated tangential force exceeds the strain limit of the film, the film will be destroyed. Under the condition of three-body contact, the abrasive particles have both rolling friction and sliding friction. When the abrasive slip velocity is kept constant, the abrasive spin velocity will affect the friction and wear of the film. In the process of three-body contact friction, there is no ploughing phenomenon on the surface of the film, which leads to the tear of the film. At atomic scale, the spin effect of abrasive particles weakens the accumulation of tangential force on the surface of the film, thus effectively reducing the friction force and the wear of the film. In the process of three-body contact friction, the slight convexity on the rough substrate obstructs the motion of the film and increases the friction force, and the reduction of the contact area between the film and the substrate weakens the absorbability of the substrate and the film. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号