汽油机活塞顶面镀层的设计与仿真研究  

Design and simulation research of electroplated coating on piston top of gasoline engine

作　　者：孙伟 张淑婷 杜开平 欧阳佩旋 杨谨赫 Sun Wei;Zhang Shuting;Du Kaiping;Ouyang Peixuan;Yang Jinhe(College of Mechanical and Material Engineering,North China University of Technology,Beijing 100144,China;Mining and Metallurgy Technology Group Co.,Ltd.,Beijing 100160,China)

机构地区：[1]北方工业大学机械与材料工程学院,北京100144 [2]矿冶科技集团有限公司,北京100160

出　　处：《电镀与精饰》2023年第2期79-85,共7页Plating & Finishing

基　　金：国家重点研发计划(2018YFB2002000);北京市基金-市教委联合资助项目(KZ201910009010);北方工业大学高层次人才科研启动项目(XN277,110051360002);毓杰团队项目(XN212/009)。

摘　　要：基于有限元软件ABAQUS建立了镀层-活塞的三维几何模型,采用顺序热力耦合的有限元分析法,系统研究了镀层厚度、弹性模量和导热系数对活塞-镀层界面峰值应力的影响。结果表明:当镀层厚度在100~200μm时,活塞-镀层界面峰值应力随镀层厚度的增大而增加,从163 MPa增加至212 MPa,增大了30.06%;当镀层弹性模量在200~600 GPa时,活塞-镀层界面峰值应力随镀层弹性模量的增大而增加,从104 MPa增加至175 MPa,增大了68.27%;当涂层导热系数在50~400 W·m^(-1)·K^(-1)时,活塞-镀层界面峰值应力随镀层导热系数的增大而基本保持不变,约为171 MPa。综合考虑活塞顶面的性能需求,依据界面峰值应力与镀层结合状态的演变机理并结合实际电镀工艺:镀层厚度以150μm左右为宜,弹性模量以SiC类复合镀层材料的400~600 GPa为宜。导热系数对薄涂层活塞应力场的影响十分有限。The effects of the coating thickness,elastic modulus and thermal conductivity on the peak stress of the piston-coating interface were systematically studied by the finite element analysis method with sequential thermodynamic coupling.A three-dimensional geometric model of the coating and piston was established by using the finite element software ABAQUS.The simulation results show that when the coating thickness is 100-200μm,the peak stress of the interface increases from 163 MPa to 212 MPa with the increase of the coating thickness,increasing by 30.06%.When the elastic modulus of the coating is 200-600 GPa,the peak stress of the interface increases from 104 MPa to 175 MPa with the increase of elastic modulus,increasing by 68.27%.When the thermal conductivity of the coating is in the range of 50-400 W·m^(-1)·K^(-1),the peak stress of the interface almost remains unchanged with the increase of thermal conductivity of the coating,which is about 171 MPa.Considering the performance requirements of the piston top surface,the evolution mechanism of interface peak stress and coating bonding state,and the actual electroplating process,it can be concluded that the optimal coating thickness is about 150μm,and the optimal elastic modulus is 400-600 GPa of composite coatings with SiC.The influence of thermal conductivity on the stress field of thin-coated piston is very limited.

关 键 词：活塞 复合镀层 三维热力耦合 有限元分析 涂层性能 界面应力 

分 类 号：TG174.441[金属学及工艺—金属表面处理]