季锐,姚志敏,张洋洋,等.纳米陶瓷涂层对ω型活塞的热结构影响[J].内燃机工程,2023,44(2):51-57.
纳米陶瓷涂层对ω型活塞的热结构影响
Effects of Nano-Ceramic Coatings on the Thermal Structure of ω-Type Pistons
DOI：10.13949/j.cnki.nrjgc.2023.02.007
关键词:柴油机  活塞  热障涂层  热分析
Key Words:diesel engine  piston  thermal barrier coatings（TBCs）  thermal analysis
基金项目:
作者单位E-mail
季锐 武汉理工大学 船海与能源动力工程学院，武汉 430063 1349605849@qq.com 
姚志敏* 武汉理工大学 船海与能源动力工程学院，武汉 430063
武汉理工大学 三亚科教创新园，三亚 572019 		yaozm@whut.edu.cn 
张洋洋 武汉理工大学 船海与能源动力工程学院，武汉 430063  
王荣胜 武汉理工大学 船海与能源动力工程学院，武汉 430063  
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摘要:研究了热障涂层厚度对活塞温度、热应力及热变形分布的影响，结合硬度塞法测试无涂层活塞特征点的温度值，采用有限元法与涂层活塞仿真结果进行比较。对不同厚度的涂层进行温度和热应力分析。研究结果表明，在涂层厚度0.3 mm~0.6 mm范围内，厚度每增加0.1 mm，活塞顶面温度提高10 ℃~17 ℃，活塞基体温度下降19 ℃~27 ℃。与无涂层活塞相比，0.6 mm厚的涂层活塞基体温度最大降幅为10.8%。涂层表面的热应力随着涂层厚度的增加而减小，涂层活塞基体的热应力变化不大。最大热变形处在陶瓷涂层，最大热变形量在活塞与气缸套允许范围之内。
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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