Abstract
This paper explains the various types of coatings which include metals, polymers, aerogels and ceramics coatings applied on metal surfaces through different methods so as to prevent oxidation, corrosion, cracking, wear and increase surface temperature. Coatings are covering layers applied to metallic surfaces in engineering applications so as to improve performance. They serve as protection to the underlying material. Literatures had it that coating applied in automobile and stationary engines, gas turbines and other internal combustion engines has helped to increase their brake thermal efficiencies. This happened because of increased surface temperature achieved in the combustion chambers due to low thermal conductivity and matched coefficient of thermal expansion of the coating materials.
Highlights
Coatings are defined as covering layers applied to metallic surfaces in engineering applications to mainly reduce heat lost and boost thermal efficiency [1]
These metallic surfaces are found in gas turbines, aero-engines, compression ignition (CI) and spark ignition (SI) engine parts which operate at very high temperatures [1]
The major engineering applications where coating is of paramount importance are on the metallic surfaces of compression ignition and spark ignition engine
Summary
Coatings are defined as covering layers applied to metallic surfaces in engineering applications to mainly reduce heat lost and boost thermal efficiency [1]. These metallic surfaces are found in gas turbines, aero-engines, compression ignition (CI) and spark ignition (SI) engine parts which operate at very high temperatures [1]. The main purpose of coating metallic surfaces in engineering applications is insulating metallic parts from excessive and sustained heat It leads to increase in brake thermal efficiency which is mainly based on the temperature inside the combustion [5] This increase was achieved because of the reduction in heat transfer from the combustion chamber to the piston head during the combustion or expansion stroke [8]. Engine coating with ceramic thermal barrier improves engine reliability, durability, performance and thermal efficiency [12]-[13]
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