Abstract
Increase of wear resistance of different types of tribomating which are functioning in fluid lubrication is possible due to: choosing more expensive and high quality material of samples that is not always sensible; applying some wear resistant coatings on them; selection and formation of complex composition of oil additives. Due to nanomaterials development there is a possibility of efficient use of functional additives such as geo modifiers in tribology. Due to geo modifier-based oil composites use it’s not necessary to make any structural changes of machines mated parts though their wear resistance is increased. It requires the conducting of some experimental tribological research. It was found that oil media modified by a geo modifier increase the wear resistance of working surfaces of different types of tribomating. The use of geo modifier КGМF-1 (Katerynivka friction geo modifier-1) has been suggested. Samples division into 4 types of mating according to the following characteristic features: mobility, material hardness and friction area has been suggested for more accurate picture of wear resistance changes of samples tribomating which are functioning in base and modified oil. Lower friction torque of different samples couplings in modified oil by geo modifier КGМF-1 in comparison with base oil M-10G2K was recorded while using Friction machine 2070 SMT-1 with add-on module "ring-ring". The samples wear rate in modified oil by geo modifier КGМF-1 in comparison with base oil M-10G2K was studied by method of acoustic signal amplitude measurements directly from the friction zone by a commercially produced instrument of Brüel & Kjear company. Moreover, it was recorded that the maximum wear rate of samples in their functioning in modified oil M-10G2K + КGМF-1 was 2...3 times lower, and friction torque change law is similar to the wear rate change depending on the time of testing
Highlights
Nowadays the lubricating properties of oils are improved mainly due to commercial additive complexes
When an additive КGМF-1 is used in base oil M-10G2K on samples mating of material steel 45 – СЧ20 the friction torque is getting 5–28 % decreased comparing to the base oil (Table 2) for different types of samples mating
It was found that wear rate (Table 3) is getting smaller on different types of samples mating in a different way: 1.5-2.5 times smaller for the I type of mating; 1.3-2.1 times smaller for the II type of mating; 4.2-5.7 times smaller for the III type of mating; 1.2-1.3 times smaller for the IV type of mating
Summary
Nowadays the lubricating properties of oils are improved mainly due to commercial additive complexes. Some papers describing the effect of geo modifiers use admit that surface-active substances of a metal-ceramic reconditioner being used on friction areas with some oil provoke the process of formation of a highly wear resistant metal-ceramic coating with lower friction coefficient on the mated surfaces Due to these additives in oil medium some friction surface texturing takes place with simultaneous hardening of the main material at great depth on the samples tribomating surfaces. Mainly by adding some additives into oil, mated surfaces are being separated by soft metals [5] and long hydrocarbon chains, synthesized film It contributes to the surface optimal structure developing, especially in the contact areas with maximum number of available bonds resulting in increased oil confinement ability and equilibrium roughness [6]
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