Finite Element Thermal Analysis of A Ceramic Coated Si Engine Piston Considering Coating Thickness

摘要

In this study, 3-D finite element thermal analysis on spark ignition engine piston is carried out for investigating thermal behavior of uncoated and coated piston using commercial software called Ansys. Thermal analysis is first applied to uncoated aluminum alloy piston. Then, the behavior of top coating for four thermal barrier coatings materials namely; Yttria -stabilized Zirconia, MgZrO 3 , Alumina and Mullite are covered the piston substrate with different thickness. After that, Temperature distribution on the piston's top surface, bond and substrate surface for coating materials is investigated. Finally, the numerical results of different coating materials are compared with each other. It is observed that the temperature distribution was a function of coating thickness and high temperature appears at the center of the top surface of the uncoated piston. Also, it was clea rly found that the temperature developed at the top surface of coated region is higher than that of the uncoated piston surface. It was observed that the substrate temperature is decreasing with increase the thickness o f c o a t i n g. It was shown that the maximum surface temperature of Yttria - stabilized Zirconia, MgZrO 3 , Alumina and Mullite coating is increases by 117.47%, 144.76 %, 15.014 and 44.86 % respectively for 1.6 mm thick coating.