| The emergence of nano-technology, especially the advance of the technology in preparing nano-powder, has brought along a series of new research activities in the field of nano-lubrication. The aspect of nano-lubrication is an important area which is arising a great deal of research interest Based on the knowledge in the disciplines of tribology, nano-powder preparation technology, organic chemistry, surface chemistry, electrochemistry, structural chemistry, material science and so on, this research specifically emphasized on the development of a self-repairing nano-copper lubricating additive NT1. The additive has fine anti-wear and anti-friction ability, high anti-xtreme pressure function and good self-repairing capacity. Infra-red spectrum analysis was performed so as to understand the structure of the additive. The effect of tribological system on NT1's tribological characteristics was conducted. The synergistic influence; of Nil with other lubricating additives and ths structures of deposited film on the surface of friction pairs were carried out. Surface textures and elemental compositions of the worn surface were studied microcosmically using some available modem microcosmic analytical techniques. Finally, an electrophoresis model and a dynamics model were established and herewith put forward for studying the self-repairing nano-copper lubrication mechanisms of the NT1 additive.Main contributions and results of this research include:( I ) The production of nano-copper brei from adequate selection of some accessory ingredients based on the technology of super-fine powder preparation and the fundamental of surface chemistry. Best composition of materials for making nano-copper brei was subsequently determined by a series of orthogonal experimental approaches.(II) The establishment of the approach for preparing nano-copper self-repairing lubricating additive by the mixing of triethanolamine and based oil, and by the steadily scattering of the uniformly dispersed nano-copper brei into the based oil.(III) The study of the trifaological characteristics of the additive NT1. The research results indicated that additive NT1 have wear-self-repairing effects, and it can reduce the friction coefficients and improve anti-wear ability for the steel / steel rubbing pairs markedly,. The achievement of best tribological characteristics of N68NT1 with 4% of self-repairing nanopaticle additive NT1 in N68 oil. The friction coefficients of N68NT1 lubrication is 56.2% and 51.1% of MobilSAE40 and N68 oil respectively for the steel /steel rubbing pairs. On the side, the Study of tile effects of iribologica) system on the tribological characteristics of the self-repairing nano-scale NT1 additive particles under various tribological parameters like: relative sliding velocity, surface roughness of friction pair, the different affixion masses of additive and load, etc.(IV) The setting up of the reacting dynamic formulae of Cu coordination compound on the steel/copper friction pair surface during frictional sliding by carefully correlating the vase of testing data with the surface molecule reacting dynamics. According to the formulae, the depth of coordination compound dynamically reacting on the steel/steel friction pair surface arrived at a constant value after sliding for a period of time under frictional condition.(V) The proposal of an electrophoresis model for the self-repairing NT1 nano-copper lubrication. The explanation of the effects of selective transfer on the course of friction was given. The lubricating mechanism for self-repairing nano-copper lubricating additive was studied. The reason why the N68NT1 having excellent lubricating properties was identified as synthetical effects of several deposit coatings.Guo Zhiguang(Mechanical Design & Theory) Directed by Prof Gu Kali & Prof Xu Jiansheng... |
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