Thermal coatings properties by duplex technology

Abstract

The article deals with the production and evaluation of thermal spraying layers using duplex technologies, namely a combination of electric arc spraying (EA) and High-Velocity-Oxy-Fuel (HVOF) flame spraying. The coatings are realized in this way can make a layer thickness of up to several mm. They are usually realized as three-layer. Composition: substrate, intermediate layer (NiTi), filling layer (13 % Cr steel), and final layer (WC-Co). The coatings made in this way were tested by metallographic and selected mechanical tests. The achieved results significantly expand the possibilities of using standard thermal coatings .