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首页> 外文学位 >Dynamic changes of surface films under boundary lubrication: A study using ellipsometry.
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Dynamic changes of surface films under boundary lubrication: A study using ellipsometry.

机译：边界润滑条件下表面膜的动态变化：椭圆偏光法的研究。

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摘要

Wear and friction behavior in boundary lubrication are strongly influenced by surface films on the sliding parts. These surface films change dynamically while sliding takes place. In spite of this importance few studies have focused on the progression of change of those films. This study focused on simultaneously monitoring dynamic changes on the surface and friction forces between the sliding parts, with the objective of finding cause-effect (surface film - surface failure) relations that could lead to a better understanding of the process of friction and wear.; The main technique used for the monitoring of the surface while sliding was ellipsometry. A special Ellipsometer was used (Division-of-Amplitude-Photopolarimeter Mueller -Matrix Ellipsometer). The wear test rig used was a cylinder-on-disk type specially designed to be coupled with the ellipsometer. The friction force was also measured during the test. The specimens were made of AISI 1080 steel and AISI M2 steel. The disk roughness and hardness were varied to study their influence. Bearing rollers (AISI 52100 steel) were used as the second sliding body. The initial Hertzian contact pressure (maximum) was 900 MPa. Specimens were submerged under low viscosity hydrocarbons (Diesel type fuels with and without additives) functioning as lubricants.; Other analyses performed were: (1) measurement of wear scars on the cylinders, (2) evaluation of the final roughness on disks, and (3) microscopic analysis of the disk surface using Nomarski differential interference contrast.; The main conclusions of the study are: (1) Films are formed mainly as "patches" corresponding to the localized contact areas during the sliding of the surfaces. The surface roughness is not significantly changed by these films. (2) No connection was found between the apparent thickness, or amount of coverage and the protective properties of formed surface film. This implies that mechanical and chemical characteristics of these films are more important than their thickness or covered area. (3) Significant changes on the surface are registered with the Ellipsometer when scuffing occurs, indicating the capacity of the technique to monitor dynamic changes taking place on the surface under boundary lubrication. However the assumption of continuous films, used in previous works, has to be revised based on these findings.
机译：边界润滑中的磨损和摩擦行为受到滑动零件上表面膜的强烈影响。这些表面膜在发生滑动时会动态变化。尽管如此重要，但很少有研究集中在这些电影的变化过程上。这项研究的重点是同时监视表面动态变化和滑动部件之间的摩擦力，目的是发现可能导致对摩擦和磨损过程有更好理解的因果关系（表面膜-表面破坏）。 ;椭圆滑动法是在滑动时监测表面的主要技术。使用了特殊的椭圆仪（振幅分光光度计Mueller-矩阵椭圆仪）。所使用的磨损试验台是专门设计用于与椭偏仪耦合的圆盘圆柱型。在测试过程中也测量了摩擦力。标本由AISI 1080钢和AISI M2钢制成。改变盘的粗糙度和硬度以研究其影响。轴承滚轮（AISI 52100钢）用作第二滑动体。初始赫兹接触压力（最大）为900 MPa。样品浸没在起润滑剂作用的低粘度碳氢化合物（含和不含添加剂的柴油型燃料）下。进行的其他分析包括：（1）测量圆柱体上的磨损痕迹；（2）评估磁盘的最终粗糙度；（3）使用Nomarski微分干涉对比对磁盘表面进行微观分析；以及研究的主要结论是：（1）薄膜主要形成为“斑点”，对应于表面滑动过程中的局部接触区域。这些膜不会明显改变表面粗糙度。 （2）在表观厚度或覆盖量与形成的表面膜的保护性能之间没有发现联系。这意味着这些薄膜的机械和化学特性比其厚度或覆盖面积更为重要。 （3）当发生划伤时，表面显着变化会记录在椭偏仪上，这表明该技术具有监测边界润滑条件下表面动态变化的能力。但是，必须根据这些发现修改先前作品中使用的连续胶片的假设。

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  • 作者

    Castillo, Jose.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Mechanical.; Engineering Materials Science.; Physics Optics.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 169 p.
  • 总页数 169
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;工程材料学;光学;
  • 关键词

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