Research of physical and mechanical properties contact materials of electromagnetic starters which are applied by a gas-plasma method
DOI:
https://doi.org/10.31548/energiya2019.06.146Abstract
Abstract. The laws of physical and mechanical processes occurring during the deposition of the surface of the restored contact nodes of electromagnetic starters are revealed; The dependences of the quality and thickness of the coating, as well as the amount of transferred material on the electrical characteristics of the gas-plasma spraying technological process, are investigated. The patterns of coating formation with high mechanical properties on contact parts are established.
It is noted that the restoration of contacts of switching devices by coating the worn working layer by gas-plasma spraying is the most simple, economically feasible method of recovery.
To restore the working layer of the contacts of the PML-1200.O4 electromagnetic starters, research contact materials based on copper and silver are offered. To compare the physicomechanical properties, the following materials were taken: copper, brass, aluminum, and СОК15 material. During the study, the following physical and mechanical properties were determined: hardness during switching tests, density of sprayed materials, porosity of a gas-plasma coating, fatigue strength of sprayed materials, determination of coating thickness. Naturally, all the physicomechanical properties of the sprayed material are determined by the technological parameters of the spraying mode, which significantly affect the scattering radius of the material, which depends on the plasma torch design (anode diameter, gas stabilization method, etc.) and spraying mode (electric power, composition and flow rate of plasma-forming gas, spraying distance). As a rule, its value is in the range of 4 - 8 mm. The coating over a given area occurred due to the linear movement of the plasma torch in combination with either the transverse displacement of the plasma torch or the contact part.
The specific mechanism of the formation of coatings from sprayed materials and the difficulty of manufacturing experimental samples determined the need for special studies of the properties of sprayed coatings: tensile and compressive strength, elastic characteristics of the stress state, thermal expansion and thermal conductivity, and switching wear resistance of restored contacts.
Key words: gas-plasma spraying, contact material, density, porosity, hardness, fatigue tests, coating thickness, electroerosive wear
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