The Paton Welding Journal, 2013, №12



2013 №12 (01)

2013 №12 (03)

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The Paton Welding Journal, 2013, #12, 9-15 pages

STUDY OF EFFECT OF ELECTRIC ARC SPRAYING MODES ON STRUCTURE AND PROPERTIES OF PSEUDOALLOY COATINGS

Yu.S. BORISOV, N.V. VIGILYANSKAYA, I.A. DEMIANOV, A.P. GRISHCHENKO and A.P. MURASHOV

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
A study of effect of electric arc spraying conditions on structure and properties of steel-copper pseudoalloy coating was performed. A method of multifactor experiment planning was used for determination of level of influence of spraying factors on coating characteristics. Analysis of splat specimens showed that the drops of metal are in a liquid state during collision with a basis at all studied modes of spraying. The regression equations were received which combine technological modes of spraying (rate of wire feed, voltage, consumption of compressed air, spraying distance) with hardness, content of steel and copper constituents, oxides and pores in the coating. It was determined that content of copper in total volume of the coating, obtained by spraying of steel and copper wires of similar diameter, depends on a heat input in spray consumable and makes around 35 vol.% at 0.6-1.0 MJ/kg and approximately 22 vol.% at 1.4-2.2MJ/kg. Possible reasons of reduction of copper content are the burn-out (evaporation) and oxidation of copper in spraying process due to its reheating above melting point. The most efficient method of reduction of copper loss due to its burning out during spraying of pseudoalloy steel-copper coating is decrease of level of heating of spray particles and increase of their speed due to rise of compressed air consumption and reduction of heat input in the spray consumable. The best complex of structure and properties of electric arc pseudoalloy steel-copper coatings based on indexes of preservation of component relation (1:1), porosity (8 vol.%), level of oxidation (21 vol.%) and hardness (2700 MPa) was received in the case of spraying with 1.0 MJ/kg heat input in the wire and 126 m3/h consumption of compressed air. 22 Ref., 2 Tables, 8 Figures.
 
 
Keywords: electric arc spraying, pseudoalloy coatings, microstructure, porosity, oxidation, microhardness
 
 
Received:                19.06.13
Published:               28.12.13
 
 
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