Abstract
Abstract The rapid development of aerospace industry has made more and more machinery parts of equipment working at high temperature. Due to the lubrication failure of lubricating oil and grease at high temperature, solid lubricant coatings are almost the only effective method to achieve super low friction at high temperature. In recent years, the tribological properties of diamond-like carbon (DLC) films have been extensively studied at high temperature. The present study reviews the microstructure of DLC films and the influence of doping different elements on the structure of DLC films. Second, the mechanical properties and thermal stability of pure DLC films and DLC doped with different elements are also described. DLC films have different microstructures and tribological properties by different preparation methods. Finally, the high-temperature lubrication failure mechanism of DLC films and the tribological properties of DLC films when doped with different elements are discussed from the macro and micro perspectives.
Highlights
With the continuous development of aerospace and other fields in recent years, the requirements for high utilization of resources and energy are increasingly urgent
The results indicated that Ti-diamondlike carbon (DLC) films show a uniform color on the substrate and has the lowest surface roughness (Ra) and root mean square roughness (Rq) among the three films
The results indicate that the hardness of the films decreases with the increase in the annealing temperature, and the hardness of amorphous carbon (a-C):H films decreases beginning at a lower temperature than does that of Si-doped DLC films (Si-DLC)
Summary
With the continuous development of aerospace and other fields in recent years, the requirements for high utilization of resources and energy are increasingly urgent. The lubrication technology at high temperature has been extensively studied, and many nanocomposite coatings have shown excellent tribological properties. The author attributed the high temperature and low friction of Si-DLC to enhanced thermal stability and formation of a Si-containing lubricant layer on the surfaces of the wear tracks. The research on DLC films has been very in-depth, but how to achieve DLC films with low friction at high temperature while maintaining good mechanical properties has not yet been resolved Based on this point, this article mainly has addressed the related research in recent years from the thermal stability and the high-temperature friction behaviors of DLC films, and prospects the practical application of DLC films and the subsequent research directions
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