Evaluation of Tribological Performance of High Functional Surface Midified Machine Element under High Temperature in High Vacuum

高功能表面改性机械元件在高真空高温下的摩擦学性能评价

基本信息

批准号：
10650147
负责人：
FUJII Masahiro
金额：
$ 2.11万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650147/
关键词：
Surface Modification Tribology High Vacuum High Temperatue Machine Element Friction Wear

项目摘要

In order to evaluate the tribological characteristic and peformance of high functional modified surface, the comprehensive experiment and analysis were performed under high temperature in high vacuum.Kinds of high functional sliding materials were wear-tested under high temperature in high vacuum and the information of their ability were obtained.In order to clarify the influence of surface modification on rolling contact fatigue strength the surface modified rollers were fatigue-tested and their contact pressure and subsurface stresses were analysed with the boundary element method. The reason why the improvement of rolling contact fatigue strength by surface modifications would be due to the reduction of contact pressure and subsurface stresses.Various electroless Ni platings were wear-tested with a two-cylinder test machine and the influence of dispersed particles in the plated layer on friction and wear behaviors was investigated with the finite element method analysis. When the elastic modulus of the dispersed particles is smaller than that of the matrix, the maximum shear stress and Mises stress around the dispersed particles become large, resulting in wear increasing. It was indicated how to decide the optimum particle size.Fractal dimensions of various worn surfaces were analysed with data measured with a profile meter and a laser-scanning microscope, and applied to the evaluation of worn surface. It was obvious that the more beneficial information could be obtained using fractal dimensions analysed with both instruments.

为了评价高功能改性表面的摩擦学特性和性能，在高温高真空条件下进行了综合实验和分析。为了明确表面改性对滚动接触疲劳强度的影响，对表面改性滚子进行了疲劳试验，并采用边界元法对其接触压力和表面下应力进行了分析。通过表面改性提高滚动接触疲劳强度的原因是接触压力和亚表面应力的降低。利用两缸试验机对各种化学镀镍层进行了磨损试验，并研究了镀层中弥散颗粒的影响。采用有限元方法分析研究了涂层对摩擦磨损行为的影响。当分散颗粒的弹性模量小于基体弹性模量时，分散颗粒周围的最大剪切应力和米塞斯应力变大，导致磨损增大。指出了如何确定最佳粒径。利用轮廓仪和激光扫描显微镜测量的数据，对各种磨损表面的分形维数进行了分析，并将其应用于磨损表面的评价。显然，使用两种仪器分析的分形维数可以获得更有用的信息。