Study Of The Wear And Self-repairing Characteristics Of GCr15/45#Steel With Nano-additive Lubrication Oil

All machines run with friction, which causes wear of the machine components. Wear will further lead to surface damage, component failure and material loss, which causes a large number of energy consumption. One effective way to reduce wear is lubrication. However the traditional lubrication oil only prolong the service life of the machine by only reducing the wear between surfaces of relative movement without offering the self-repairing ability during friction. Additives can greatly improve the performance of lubrication oil. With the development of Nano-technology, Nano-materials are applied to additives, improving materials anti-wear,anti-friction and self-repairing properties,due to the special performance of the Nano-additive.The tests are carried on PLINT Deltalab-NENE-7horizontal electro-hydraulic servo fretting wear testing machine. The friction pairs contact in a ball-plane mode. Spherical specimen material is GCr15steel and flat test material is45#steel. Test results are affected by changing the frequency, load and other test parameters with different Nano-additives in the lubricating oil. Analyses of45#steel’s worn surfaces,wear debris and EDX energy spectrum were carried out by optical microscope, scanning electron microscope and EDX and roughness profiler.Main conclusions are drawn as follows:(1) In the condition without Nano-additives, the friction coefficient and the wear volume are bigger. Nano-additives can significantly reduce the friction coefficient and the wear of material.(2) Through a lot of friction and wear tests, the wear characteristics of Nano-titanium nitride, Nano-alumina, Nano-titanium dioxide and Nano-silica dioxide in base oil were derived with the comparison group of the base oil and oil-soluble Nano-copper alloy. By observing the coefficient of friction, wear scar morphology and EDX spectra comparison analysis of the four state Nano-materials as anti-friction, anti-wear and self-repairing properties.Under the same external conditions, coefficient of friction relationship is: Al2O3>SiO2>TiO2> TiN. Anti-friction and anti-wear properties are in the order of titanium nitride, titanium dioxide, silica, alumina, from good to bad.Comparing to the result of the oil-soluble Nano-copper alloy as contrast group,repair film properties are in the order of TiN>TiO2>A12O3>SiO2. The best in self-repairing effect is TiN, followed by TiO2: A12O3and the last is SiO2(3) The impact of changes in frequency and load on the friction properties of self-repairing performance are studied under Nano-additives lubrication conditions. In a certain range, with the increased frequency, the coefficient of friction shows an overall decreasing trend; the grinding spot area also decreases and wear becomes less servere, while the self-repairing performance is enhanced. In a certain range, with the increasing load, the coefficient of friction shows an overall increasing trend; wear area becomes bigger.But the wear decreases,with the enhanced self-repairing performance.