Thermal and Structural Analysis of Functionally Graded NiCrAlY/YSZ/Al₂O₃ Coated Piston

The analyses of frictional losses and thermal stresses in a diesel engine piston coated with different thicknesses of thermal barrier films using co-simulation method

“…These results are also good agreement with the literature. In the studies of Ayatollahi et al, 6 Ganapathy Pandian et al, 18 and Lu et al, 23 the related area is asserted as the highly stress exposed region, since it provides the contact of piston to pin and also stiffness to the solid body, therefore, the displacement of contact area is constrained with each other that leads to a higher mechanical stress. Herein, it must be implied that the piston pin and the piston pin bore region were constrained by simulating with frictional contact instead of bonded contact to execute more realistic case.…”

“…Before the main model generation process, TBCs related studies were reviewed from the literature. 3–6,8,9,11–22 When some of them 3,11,13,18,20 state the bond coatings have thicknesses in the interval of 0.1 and 0.15 mm, different one 19 points as 0.2 mm and another one 22 implies as in the interval of 0.1 and 0.3 mm. It can be implied that 0.1 mm thick bond coating is usually studied.…”

“…Another possible constraint was evaluated as the emission issue. In the papers 3,4,9,11,18,20 potential effects of higher temperatures in-cylinder are stated as providing lower emissions of unburned hydrocarbons (UHC) and carbon monoxide (CO). On the other hand, the TBCs, which have porous structure, are stated as absorbing and desorbing UHC leading to increase in thermal conductivity of TBCs and UHC emissions in the paper.…”

“…20 Moreover, the compatibility of this type coating was investigated and it was noticed that NiCrAl based bond coatings are used with the related top coatings. In literature, although NiCrAlY is commonly selected, 13,18,19,22 NiCrAl is also noticed in some of the studies, 3,20 so it was paid attention to the compatibility of these bond coatings with the top coatings used in this study. For instance, YPSZ top coating on a bond coating based on NiCrAl was evaluated experimentally in literature, 20 therefore, bond coating of NiCrAl (without Yttria) was selected instead of Yttria containing one for the Group C to provide consistency with literature.…”

“…For instance, YPSZ top coating on a bond coating based on NiCrAl was evaluated experimentally in literature, 20 therefore, bond coating of NiCrAl (without Yttria) was selected instead of Yttria containing one for the Group C to provide consistency with literature. When these studies 3,[13][14][15][16][17][18][19][20][21][22] are evaluated, it may be asserted that the TBCs are available to be used for IC engine pistons. Even some of them are still being studied for especially diesel engine pistons and one of them has been researched for jet engine turbine blades.…”