Thermal Barrier Coating on IC Engines; A Review

Abstract

In the recent years, usage of fossil fuels had increased rapidly which negatively affects the environment like ozone depletion, hazardous emission content in atmosphere, etc., so in order to avoid this many technologies have been discovered, but among them Thermal Barrier Coating draws great attention because of its brilliant properties like reducing various toxic emissions like NOX, CO, Smoke, SOX, etc., and reducing thermal stresses, erosion, and corrosion on metallic surfaces of IC engines, so this process became the industrial standard for many automobile companies. TBCs are bi-form systems that consist of Top coat, Bond coat. These two layers are deposited on the metal (substrate) that needs to be coated. TBC’s empower very high surface temperature due to this heating of charge during intake can be minimized which causes increase in engine efficiency. By adopting TBC’s on engine, the in-cylinder temperature gets increased up to 1000 °C compared to the uncoated engine, which helps in reducing emissions of IC engines. TBCs are not only used in IC engines, turbines but they are also used on the surface of disc brakes, which reduces heat dissipation on it due to huge braking conditions. Many of the automobile companies use coating with less than 0.2 mm in order to obtain high performance of engines. By introducing just TBC’s cannot improve performance and emissions of engines there are few parameters that need to be observed like properties of coating materials (nano or micro), Deposition techniques, Implementation of nanomaterials, Exhaust characteristics, Coating construction (multilayer), etc. So this paper describes these parameters based on the colonial work of many researchers.