隔热涂层对活塞温度场及应力场的影响分析  

Analysis of Influences of Heat Insulation Coating on Temperature Field and Stress Field for Piston

作　　者：宋庆军 李文平 王明明 王吉洋 邓飞 邵亮 Song Qingjun;Li Wenping;Wang Mingming;Wang Jiyang;Deng Fei;Shao Liang(Global R&D Center,China FAW Corporation Limited,Changchun 130013;Standard and Quality Control Research Institute,Ministry of Water Resources,Hangzhou 310012)

机构地区：[1]中国第一汽车股份有限公司研发总院,长春130013 [2]水利部产品质量标准研究所,杭州310012

出　　处：《汽车工艺与材料》2023年第6期51-57,共7页Automobile Technology & Material

摘　　要：以汽车发动机铝合金活塞为研究对象,建立等离子喷涂涂层隔热性能分析仿真模型,综合分析粘接层材料及孔隙率对涂层隔热性能的影响,并对涂层样块进行隔热性能试验。结果表明:隔热涂层的存在使活塞金属基体的温度显著降低,其中ZrO2隔热层+NiCrAlY粘接层的组合隔热性能最好,且随着粘接层孔隙率的增加,涂层隔热性能提升,但孔隙率过大会导致涂层与基体的机械结合强度降低,综合考虑隔热性能与结合强度结果,涂层粘接层的最佳材料为NiCrAlY、最佳孔隙率为10%,喷涂上述隔热涂层后,在实际工况条件下活塞的等效热应力值满足产品设计要求。With aluminum alloy piston of automobile engine as the research object,a thermal insulation performance analysis simulation model of plasma spraying coating was established,the influences of bonding layer material and porosity on thermal insulation performance of coating were analyzed comprehensively,and the thermal insulation performance of coating sample block was verified by test.The test results show that,the thermal insulation coating can significantly reduce the temperature of piston metal matrix,and the thermal insulation performance of ZrO2 thermal insulation layer+NiCrAlY bonding layer is the best.With the increase of porosity of bonding layer,the thermal insulation performance of coating improves,but the mechanical bonding strength between coating and matrix decreases due to excessive porosity,considering the results of thermal insulation and bonding strength,the best material for bonding layer is NiCrAlY,and the best porosity is 10%.After spraying the thermal insulation coating,the equivalent thermal stress value of the piston meets the design requirements of the product under actual working conditions.

关 键 词：隔热涂层 活塞 温度场 应力场 

分 类 号：TK415[动力工程及工程热物理—动力机械及工程]