Performance Evaluation of Characteristics of Thermally Sprayed Industrial Ceramic Coatings

摘要

The design of an engineering surface is concerned with preparing a surface with suitable modifications, so as to meet the functional requirements of the engineering components. Among several surface modification techniques, plasma spraying and high velocity oxy-fuel (HVOF) spraying techniques are more precise and widely used for many advanced industrial applications. Thermally-sprayed coatings give high strength at elevated temperatures, wear resistance, resistance to chemical reaction, and also corrosion protection on engineering components. However, the quality and functional requirement of ceramic coatings can further be improved by eliminating the presence of cracks and defects in the coatings by suitable post-processing technique (microwave glazing). In this paper, an attempt has been made to study various mechanical and tribological characteristics of tungsten carbide cobalt (WC-CO) HVOF coating as well as Atmospheric Plasma Spraying (APS) ceramic coating, used in different coatings. An experimental study is also formulated to evaluate an important mechanical characteristics such as porosity, bond strength, hardness and tribological characteristics, including fatigue behaviour of the coated components. This paper also highlights a novel post-processing technique of ceramic coatings by microwave glazing to improve the performance of engineering surfaces by achieving high quality coatings.