Thermal barrier coatings are becoming increasingly important in providing thermal insulation for heat engine components. Thermal insulation reduces in-cylinder heat transfer from the engine combustion chamber as well as reducing component structural temperatures. Containment of heat also contributes to increased in-cylinder work and offers higher exhaust temperatures for energy recovery. Lower component structural temperatures will result in greater durability.Advanced ceramic composite coatings also offer the unique properties that can provide reductions in friction and wear. Increased combustion temperature can increase the thermal efficiency of the engine and decreases the pollutants like HC,COand (possibly) theNO_x emission rate. To reach the desirable operating temperature of 850-900°C in the combustion chamber from the current conventional Engine temperature of 350-400°C, a ceramic coating with a thickness of 0.25mm to is required.

Key words: Ceramic coating, thermal barrier, StructuralTemperatures, Energy Recover