Mechanism of Friction Reduction and Nanoscale Controlling Factors in MoDTC/ZDDP Tribofilms

摘要

Tribology is the technology or field of study concerning interactions between surfaces of two materials performing repetitive relative motions. The coating of the region of sliding by different materials, a modification of the chemical state of the surfaces and a change of lubrication conditions allow the provision and the control of specific physical properties of the sliding surfaces on the nanometer scale. Therefore, the discovery of new tribological properties and a significant improvement of the functions can be expected. That is why a close attention has been focused on studies related to functions, properties and nanostructure of the sliding surfaces considered as factors of the control of microscopic triboproperties and the studies have been quickly performed. The clarification of the correlations and such factors of control strongly require the direct acquirement of information about different physical properties and characteristics on the nanometer scale. However, traditional analytical and problem solving methods are mainly based on the application of beams (light: optical microscopy and infrared spectroscopy; X-ray: X-ray photon-electron spectroscopy (XPS) and X-ray diffraction; electron beam: electron microscopy, Auger electron spectroscopy (AES), and electron probe microanalyzer and the like). All these methods focus on information on morphology, composition, structure, and conditions. Therefore, it is rather difficult to acquire information on physical properties by direct measurements using the above analytical methods. Accumulating indirect experimental information and knowledge and experience only allow generally estimating phenomena.