Effects of alloy ratio and coating thickness on temperature distribution of thermal barrier coatings

다국어 초록 (Multilingual Abstract)

Pistons on internal combustion engines that are constantly subjected to high pressure and temperature should be light,resistant to heat, resistant to corrosion and have adequate hardness to work more efficiently and to have longer lifecycles. Forthis purpose, piston surfaces are coated with thermal barrier that increases resistance against heat and corrosion. In this study,temperature distribution on piston surfaces were numerically analysed for ceramic coating on a piston. For this purpose, itis assumed that 100 μm NiCrAl coating is applied as bond coat on piston upper surface. This coating was coated withMgZrO3+NiCrAl alloy with different alloy ratios for different coating thicknesses. MgZrO3+NiCrAl alloy thickness waschanged between 200 μm and 600 μm. For all analysed coating thicknesses, MgZrO3 ratio in the alloy was changed between100 to 10% and simulations were repeated for different alloy rates. As a result of these analysis, it was determined that asMgZrO3 ratio in the alloy decreased, piston upper surface temperature decreased as well. For all alloy ratios, maximumtemperature was observed on piston upper surface. Additionally, it was determined that as piston upper surface coatingthickness increased, piston upper surface temperature increased as well.

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