The Effect Of Aluminum Nanoparticles On The Tribology Mechanism And Property In Lubricant Material And Heat-treatment

Adding additives into oil to reduce friction and wear and even to mend the worn surface has been widely applied in lubrication engineering for quite a long time. There are four generations of additives which have been created or invented up to now. In the past few years, the emergence of nano-materials has provided a new choice for the development of lubricant additive. With the aid of nano-materials, a lot of novel work has been done with enormous encouraging achievements obtained because the tribological properties have been enhanced obviously. As for the mechanism of anti-wear and friction reduction, the following explanation has been predicted by most of professionals that the nano-particles act as spacer between the two friction surface, and some ever proposed that the nano-particles were rolling like a ball in the grinding area which leads to the reduction of friction coefficient. However, as the development of research, more and more people hold the points that the structural nano-particles show exceptional tribological performance as additives to liquid lubricants, but its mechanism of anti-wear and friction reduction is little to know. In order to make further research of FR and AW mechanism, firstly the morphologies of metal nano-particles were observed by TEM and HRTEM, and the thermal property was investigated by TG-DTA equipment. Also, the particle component was measured by the ration analyse method of X-ray diffraction. Then, the structure of Multi-walled hollow nano-paticles can be get by heat treatment and be analyzed by X-ray diffraction. As the result, we can get the proper technics condition. For the purpose of clearly understanding FR and AW mechanism of metal nano-particles, first we need to know in what kind of lubricating state the FR property was operated, so we investigated the tribology property of structural nano-particles on the friction and wear testing machine, and Stribeck curves were made on the basis of testing data. After observing wear surfaces, we made an in-depth discussion of FR mechanism in different lubricating state. The analysis result shows that metal Al particle acts as a ball rolling in the Hydro Dynamic Lubrication state and acts as spacer in the Boundary Lubrication state to achieve the FR effect.