Ceramic Coating is a protective thin film for all kinds of parts and can dramatically increase their useful life, and therefore, productivity increases by reducing maintenance downtime and by achieving longer run times before repairs are needed.
Ceramic coatings are inorganic, non-metallic solid and inert thin films made by deposition, heating and subsequent cooling, which may be crystalline. That is, the definition of ceramic coatings is often restricted to inorganic crystalline thin films. About the fabrication of ceramic coatings, the main methods are physical deposition and chemical deposition, such as electrochemical deposition, which can affect the microstructures and properties of the ceramic coatings.
After a consideration of the previously outlined properties that were desirable in a high-temperature protective coating, it was concluded that a coating of greater refractoriness than that of conventional ground coats would be required.
Ceramic coatings applied to diesel engine combustion chambers are aimed to reduce heat which passes from in-cylinder to engine cooling system. Engine cooling systems are planned to be removed from internal combustion engines by the development of advanced technology ceramics. One can expect that engine power can be increased and engine weight and cost can be decreased by removing cooling system elements.
Zirconia has an important place among coating materials with its application areas and properties essential to itself. The most important property of zirconia is its high temperature resistance considering ceramic coating application in internal combustion engines. Ceramics containing zirconia have high melting points and they are durable against thermal shocks. They have also good corrosion and erosion resistances. They are used in diesel engines and turbine blades to reduce heat transfer.
Ceramic coatings which are applied to reduce heat transfer are divided into two groups. Generally, up to 0.5 mm coatings named as thin coatings and thick coatings are up to 5-6 mm. Thin ceramic coatings are used in gas turbines, piston tops, cylinder heads, valves and diesel engines. At the beginning of ceramic coatings to low heat rejection engines, thick monolithic ceramic coatings were applied to engine parts. Later, it was understood that these coatings are not appropriate for diesel engine operation conditions. Thus, new approaches were started to develop.