Papers by Author: Long Lu

Abstract: On the basis of theory research and transmission machinery robust optimal designing system, a new software RODS for structural parameters optimal design is developed with C programming language, by which the complex calculation is fulfilled with computer automatically. This software is easy to understand, and it also can fulfill the optimal design of gear pump structural parameters quickly and efficiently.

Abstract: 40Cr steel substrate was coated with TiAlN/TiN films by multi-arc ion technology. The effect of technical elements on the surface and micro hardness of TiAlN/TiN films had been studied with metallographic microscope, SEM and micro hardness instrument. The results show that the negative bias and the target current have marked influence in performance of TiAlN/TiN films. The content of Ti and Al in films becomes lower and lower when the negative bias becomes higher and higher. The content of Ti/Al of films increases when the target current increases. The micro hardness increases firstly and then drops with the increase of negative bias or the target current.

Abstract: 40Cr steel substrate is coated with TiAlN/TiN films by Multi-arc ion technology. The properties of sliding friction and wear on the surfaces of TiAlN/TiN films and substrate are tested by using the machine of friction and wear. The carrying capacity and tribological properties are investigated. The surface morphology of wear specimens is observed and the elements of wear scar center are analyzed. The results show that the friction coefficient of TiAlN/TiN films is lower than 40Cr under the same conditions. The wear scar of TiAlN/TiN films is lower and the wear loss is fewer than 40Cr. The TiAlN/TiN films can successfully reduce friction and wear resistance.