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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.

为了评价高性能改性表面的摩擦学特性和性能，进行了高真空高温下的综合试验和分析，对几种高性能滑动材料进行了高温高真空磨损试验，获得了它们的磨损性能信息；为了阐明表面改性对滚动接触疲劳强度的影响，对表面改性后的轧辊进行了疲劳试验，并用边界元方法分析了它们的接触压力和亚表面应力。表面改性提高滚动接触疲劳强度的原因在于降低了接触压力和亚表面应力。在两缸试验机上对不同化学镀镍层进行了磨损试验，并用有限元分析方法研究了镀层中分散颗粒对摩擦磨损行为的影响。当弥散颗粒的弹性模数小于基体的弹性模数时，弥散颗粒周围的最大剪应力和米塞斯应力变大，导致磨损量增大。利用轮廓仪和激光扫描显微镜测量的数据，分析了不同磨损表面的分维，并将其应用于磨损表面的评价。显然，使用这两种仪器分析的分维可以获得更有益的信息。