摘要
热障涂层具有较低的热导率、较高的熔点和良好的隔热性,能够有效降低金属基体的温度。采用有限元法建立6种不同涂层厚度组合热障涂层系统模型,对比分析陶瓷层、黏结层、基体的温度场与应力场,讨论陶瓷层厚度、黏结层厚度对热障涂层系统的温度场和热应力影响。分析结果显示,在热障涂层系统中,陶瓷层至关重要,能够有效地降低基体的温度,从而延长设备的使用寿命。具体来说,陶瓷层厚度每增加0.1 mm,基体的最高温度可以下降4.6℃。该发现提供了一种优化热障涂层性能的方法,即通过增加陶瓷层的厚度来进一步降低基体的温度。然而,仅仅关注陶瓷层的厚度是不够的。研究还发现,随着陶瓷层厚度的增加,陶瓷层、黏结层和基体的热应力会不断减小。但是,当黏结层的厚度减小时,各部分的热应力会略微增大。这一结果揭示了热障涂层系统中不同组成部分之间的相互作用和平衡关系。
The thermal barrier coating has low thermal conductivity,high melting point and good thermal insulation,which can effectively reduce the temperature of the metal matrix.The temperature and stress fields of ceramic coating,bonding layer and matrix are analyzed by establishing thermal barrier coating system models with 6 different coating thickness combinations using finite element method,and the influence of ceramic coating thickness and bonding layer thickness on the temperature field and thermal stress of thermal barrier coating system are discussed.The analysis results indicates that the ceramic layer is a critical component of the thermal barrier coating system.It reduces the substrate temperature,thereby prolonging the equipment′s service life.Increasing the ceramic layer′s thickness by 0.1 mm reduces the substrate’s maximum temperature by 4.6℃.This study suggests that to enhance the performance of thermal barrier coatings,increasing the thickness of the ceramic layer is a viable option to reduce the temperature of the substrate.However,it is important to note that solely focusing on the thickness of the ceramic layer may not be sufficient.The research also indicates that with an increase in the thickness of the ceramic layer,the thermal stresses on the ceramic layer,bonding layer,and substrate decrease.However,decreasing the thickness of the bonding layer leads to a slight increase in thermal stresses in each part.This result demonstrates the interaction and equilibrium between the different components in the thermal barrier coating system.
作者
周阳
杨泽
王永超
何爱玲
Zhou Yang;Yang Ze;Wang Yongchao;He Ailing(School of Civil and Transportation Engineering,Qinghai Minzu University,Xining 810007,China)
出处
《机电工程技术》
2024年第6期33-36,113,共5页
Mechanical & Electrical Engineering Technology
基金
国家级大学生创新创业训练计划项目(202210748008)
青海民族大学高层次博士人才项目(23GCC21)。
关键词
热障涂层
有限元
温度分布
热应力
thermal barrier coating
finite element method
temperature distribution
thermal stress
