Recent Trends in Coatings

With the demand for high-fidelity coating involving metallic, multilayer, protective, and ceramic-based coatings, deposition methods have been introduced to achieve quality coatings. High temperatures cause erosion-corrosion wear, oxidation, and hot corrosion in materials operating in corrosive conditions. Among the various methods used to protect surfaces from deterioration, the method of applying coatings by high-velocity oxy-fuel spraying deserves special mention because it creates coatings with increased hardness and resilience, low (less than 1%) porosity, and high erosioncorrosion and wear resistances. Deposition of these coatings using a typical thermal spray process finds applications in the protection of base material in automobile, aerospace, orthopaedic, thermal power plant, and gas pipeline sectors. We present the potentials of the coatings and their respective protective properties. This chapter provides the optimization and overviews of the use of various recently used coating materials developed for the application in automotive, power plant, defence, gas and steam, and orthopaedic sectors.