摘要
基于四参数随机生长方法和热阻网络方法开发了涂层微结构构建和隔热性能分析软件,构建了各向异性孔隙结构的柱状涂层微结构,着重研究了柱状孔隙大小、数量和细长化对柱状涂层有效导热系数和隔热性能的影响。结果表明:提高涂层的孔隙率是增强涂层隔热性能的有效途径;孔隙率一定时,随着柱状孔隙直径减小,其隔热性能增强,并且结构更加稳定;孔隙率一定时,随着柱状孔隙细长化,其隔热性能在一定程度上会有所减弱,但其稳态导热温度分布更加均匀,结构更加稳定。
To study the effects of pore micro-structure of columnar thermal barrier coating on its thermal insulation properties, software for constructing coating microstructure and analyzing thermal insulation properties were developed by combining the methods of quartet structure generation set （QSGS） and thermal resistance network. Based on this, anisotropy pore microstructure of columnar coating was also constructed. This paper focused on the impact of columnar pore sizes, number and thickness on effective thermal conductivity and thermal insulation properties of the coating. The results show that increasing the porosity of the coating is an effective way to enhance thermal insulation properties of the coating. When porosity is constant, as the columnar pores diameter decreases, its thermal insulation properties are enhanced, and the structure is more stable. When porosity is constant, as columnar pores elongate, its thermal insulation properties are weakened to some extent, but the steady-state temperature distribution is more uniform, the structure is more stable.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2014年第5期69-74,共6页
Journal of Aeronautical Materials
基金
863计划(2014AA052803)
关键词
热障涂层
柱状微结构
孔隙率
有效导热系数
隔热性能
thermal barrier coatin
columnar mierostrueture
porosity
effective thermal conductivity
thermal insulation properties
