Abstract
The influence of multifunctional fillers on wear resistance of epoxycomposites, operated under conditions of friction without lubrication at elevated slip velocity and loadings was explored. Introduction of these fillers in the optimum amount provides high cohesive strength and gives epoxycomposites tribotechnical properties. The developed composition of materials allows the implementation of the effect of selective transfer during friction interaction. Wear intensity of epoxycomposites under different loading and velocity modes was determined, which made it possible to establish favourable mode of formation of a protective film. The analysis of structural elements of tribosurfaces of materials and a counter was carried out and chemical composition of fragments of the protective film on tribosufraces was defined. It proved a hypothesis on the formation of a copper protective film at tribosurfaces as a result of selective transfer. The reasons for initiation of the process of generation of protective film fragments on surfaces of tribobodies was established and the sequence of stages of its formation in highly filled epoxycomposites was defined. The shape, dimensions and the area of fragments of a protective film, formed at tribosurfaces of the system epoxycomposite – a steel counter body system, were determined. The formed film in the form of fragments of elongated shape in direction of the friction process stabilizes the process of tribointeraction due to the capability of self-restoring. Using the developed epoxycomposites, which operate under the mode of selective transfer, decreases friction coefficient and wear intensity due to the formation of laminar and porous structure of a film. Accordingly, it will allow controlling the process of friction, reducing material and economic costs in the process of maintenance and repair of equipment, which solves topical scientific and practical tasks of modern tribomaterials science. Feasibility of using the protective copper films in tribonodes was established, which will make it possible to expand the area of using the triboproducts in machine building, instrument engineering, chemical and light industries.
Highlights
Use of polymercomposite materials in friction nodes of modern machines and mechanisms enhances their operational and technical and economic characteristics
A peculiarity of the processes that occur in the zone of a tribocontact between polycomposite materials is a creation of protective films, which are formed at friction and are different from the source material by the structure, chemical and phase composition
For the formation of protective films on tribosurfaces of polymercomposites, it is necessary to have a source of copper atoms, which may be a part of polymercomposites in the form of dispersed particles of copper compounds
Summary
Use of polymercomposite materials in friction nodes of modern machines and mechanisms enhances their operational and technical and economic characteristics. It increases the manufacturability and makes it possible to refuse the alloys of nonferrous metals short in supply and to reduce the weight and cost of machinery [1]. Polymers are not used in their pure form, but mostly as matrices of composite materials, which are reinforced by the finely dispersed and fibrous fillers This makes it possible to expand significantly the area of application of polymeric materials, which are used for making tooth gear wheels, pulleys, elements of slipping bearings, cam mechanisms, guiding elements, compactors, seals of hinges, etc. Examining the given processes will allow the stabilization of friction process, the improvement of resistance of epoxycomposites and the management of tribointeraction process
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