Wear testing of powder coatings and investigations of microgeometry of friction surfaces under cold conditions


N.F. Struchkov*, D.I. Lebedev, G.G. Vinokurov
DOI 10.31242/2618-9712-2022-27-2-305-315

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V.P. Larionov Institute of the Physical-Technical Problems of the North SB RAS, Yakutsk, Russia
*[email protected]r.ru

Submitted 22.12.2021
Revised 17.03.2022
Accepted 20.04.2022

For citation
Struchkov N.F., Lebedev D.I., Vinokurov G.G. Wear testing of powder coatings and investigations of microgeometry of friction surfaces under cold conditions // Arctic and Subarctic Natural Resources. 2022, Vol. 27, No. 2. P. 305–315. (In Russ.) https://doi.org/10.31242/2618-9712-2022-27-2-305-315

Abstract. Intensive operation of the machinery in the natural and climatic conditions of the North often leads to premature wear of the elements of its friction units. A start-up of the equipment at low temperatures brings repeated thermal expansions of already run-in elements of friction units and changes in their geometric dimensions. An increase in the viscosity of technical lubricants in cold weather also reduces the wear resistance of friction units. The decrease in the resource of working elements and parts of the running system of earth-moving and mining equipment in the North is also due to frozen soils in the permafrost zone. Therefore, the main task of tribology for the technology of the North is the study of friction units of machines and mechanisms operated in cold conditions. The low climatic temperatures effect on the wear processes of materials of friction units, including wear-resistant powder coatings is also a task. We carried out the wear tests of modified powder coatings, profilometric and thermophysical measurements of friction surfaces on a special low-temperature stand during winter in Yakutsk (below –40 °С, December 2020, January and December 2021). We have revealed the regularities of establishing the operating temperature of the friction unit «powder coating–steel counterbody» in the cold. We have also obtained the data of mass wear of coatings and steel counterbodies, roughness parameters of contact surfaces during their sliding friction at low climatic temperatures.

Keywords: wear tests, low climatic temperatures, wear-resistant coating, counterbody, sliding friction, wear, profile

Acknowledgements. The authors are grateful to Konstantin Bolshev for the help in carrying out thermophysical measurements.

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