INVESTIGATION OF TRIBOTECHNICAL CHARACTERISTICS OF ELECTRIC ARC IRON-COPPER COATINGS WITH PSEUDO-ALLOY STRUCTURE
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 78, Issue
Abstract
Investigations of tribotechnical characteristics of electric arc pseudoalloy iron-copper coatings under con- ditions of dry sliding friction were performed. Volumetric wear and friction coefficient were determined. A method of multifactor experiment planning was used for determination of spraying parameters (wire feed rate, arc voltage, air flow rate, spraying distance) influence on coatings wear resistance. The regres- sion equation was received which shows that increasing of arc voltage leads to increase of volumetric wear of the pseudoalloy iron-copper coatings while increasing of atomizing gas flow rate leads to de- crease of the volumetric wear. The maximum wear resistance of pseudoalloy iron-copper coatings was achieved using following spraying parameters: U = 22 V, Vg = 126 m3/h. Changing the wire feed rate in the range of 180-300 m/h and the spraying distance in the range of 0.06-0.2 m does not have a significant effect on the wear resistance of coatings. The statistical dependence of the volumetric wear on the charac- teristics of the coatings microstructure (oxides content, porosity, iron and copper content, microhardness) was analyzed. A high level correlation ratio of wear resistance with iron and copper content in the coating was found. The wear resistance of coatings with ~50vol.% of copper content is two times greater than the wear resistance of coatings with ~30vol.% of copper content. This can be explained by decreasing of the coatings heating temperature in friction process and also by decreasing of the iron component contact area of the friction surface and suppression of seizing.
Authors and Affiliations
YU. S. BORISOV, N. V. VIGILYANSKAYA, I. A. DEMIANOV, A. P. MURASHOV
Keywords
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