Evaluation of the content of corundum in the wear-resistant coating applied by wire arc metallization of a powder wire with fireproof additives

Abstract

In this paper, the evaluation of the content of corundum (α-Al2O3) in the wear-resistant coating applied by wire arc metallization of a powder wire with fireproof additives has been carried out. One of the most promising high-energy methods of application of wear-resistant coatings is electric arc metallization wires, the use of the powder wires for the restoration of worn parts of equipment gives unparalleled flexibility in choice of coating material and in coatings with a variety of properties – high hardness and wear resistance, corrosion resistance, high heat resistance and heat resistance and etc. Coatings of about 300μm thickness were prepared through high temperature fusing of a powder wires on steel substrate. Corundum particles were used as a strengthening additive, Al2O3 particles exhibit high hardness, good wear resistance and thermal stability. The microstructure and morphology of the wear-resistant coatings were investigated. It is shown that the thickness of the deposited layers in the coating does not depend on the change in the magnitude of the current. The aim of this study was to investigate the influence of the arc metallization on the microstructure of the wire sprayed coatings. Meanwhile, the distribution of chemical elements in obtained coatings were investigated. In addition we found the dependence of the corundum content in the wire thermal sprayed coatings from current strength.