Features of deterioration and surface layers structure of molybdene and metal materials in mutual dry sliding under electric current | Izvestiya vuzov. Fizika. 2020. № 7. DOI: 10.17223/00213411/63/7/47

Features of deterioration and surface layers structure of molybdene and metal materials in mutual dry sliding under electric current

The possibility of the electrical conductivity increasing of dry sliding electrical contact with a current density higher 100 A/cm² by application of molybdenum counterbody was considered. It was shown that the sliding of tungsten and a sintered metal composite against molybdenum occurred with a low contact electrical conductivity and with low wear resistance. This was the main observation of this work. It was noted that a change in contact pressure in the range 0.02-0.13 MPa and a change in sliding velocity in the range 5-10 m/s did not lead to a significant increase in the electrical conductivity and wear resistance of the contact. X-ray analysis showed the absence of equilibrium oxides on the sliding surfaces of molybdenum and tungsten and the appearance of nonequilibrium chemical compounds during friction was also observed. The formation of transfer layers and their deterirations due to adhesion in the contact was established. Stress relaxation occurred by the mechanism of low-cycle fatigue in the surface layer. This was indicated as the main reason for the rapid deterioration of the surface layer and high wear. Such data on the structure of surface layers and unsatisfactory characteristics of the contact allowed us to conclude that it is impossible to significantly improve the slip parameters with the current collection against molybdenum and the unreasonability of its use as a counterbody for these conditions.

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Keywords

структура и фазовый состав поверхностного слоя, вязкое пластическое течение слоя переноса, разрушение и износ поверхности скольжения, скользящий электроконтакт, электропроводность скользящего контакта, structure and phase composition of the surface layer, viscous plastic flow of the transfer layer, deterioration and wear of the sliding surface, sliding electrical contact, electrical conductivity of the sliding contact

Authors

Name	Organization	E-mail
Aleutdinova M.I.	Institute of Strength Physics and Materials Science of SB RAS	aleut@ispms.ru
Fadin V.V.	Institute of Strength Physics and Materials Science of SB RAS	fvv@ispms.ru

Всего: 2

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