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| Effects of Nano-Ceramic Coatings on the Thermal Structure of ω-Type Pistons |
| DOI：10.13949/j.cnki.nrjgc.2023.02.007 |
| Key Words:diesel engine piston thermal barrier coatings（TBCs） thermal analysis |
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| Abstract:The effects of thermal barrier coating thickness on the temperature， thermal stress and heat deformation distribution of the piston were investigated. The temperature values at the characteristic points of the uncoated piston were tested with the hardness plug method. What’s more， the finite element method was used to compare the simulation results with those of the coated piston. Temperature and thermal stress properties of coatings with different thicknesses were analyzed. The results demonstrated that for the range of coating thickness varying from 0.3 mm to 0.6 mm， the piston top surface temperature increased 10 ℃~17 ℃ and the piston matrix temperature decreased by 19 ℃~27 ℃ when there was an increase of 0.1 mm in thickness. Compared with uncoated pistons， the maximum reduction in piston base temperature for 0.6 mm thick coating was 10.8%. The thermal stress on the coated surface decreases with the increase of coating thickness， while the thermal stress on the coated piston substrate changes slightly. In addition， the maximum thermal deformation is in the ceramic coating， within the permissible range of the piston and the cylinder liner. |
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