结构层热扩散系数对超薄涂层热力性能的影响  

INFLUENCE OF THERMAL DIFFUSIVITY OF SUBSTRATE ON THERMODYNAMIC PROPERTIES OF THE VERY THIN THERMAL BARRIER COATINGS

作　　者：王小贞[1] 张士元[2] 郑百林[3] 贺鹏飞[3] 

机构地区：[1]福州大学物理与信息学院,福州350002 [2]福建工程学院土木工程系,福州350007 [3]同济大学航空航天与力学学院,上海200092

出　　处：《力学与实践》2008年第4期68-72,共5页Mechanics in Engineering

基　　金：福建省科技厅(JB06035);国家自然科学基金(10472084)资助项目．

摘　　要：将非傅立叶热传导模型(用于超薄热涂层)与傅立叶热传导模型(用于结构层)相结合求解温度场,运用有限元法求解热涂层热应力和裂纹驱动力,并分析结构层材料热扩散系数的变化对热涂层的热力学性能(温度场、应力场和断裂性能)的影响.研究表明,结构层材料性能变化对温度场的影响主要表现在热冲击后期,对热应力和裂纹尖端驱动力后期的变化也有一定的影响.When thermal barrier coatings （TBCs） are made into laminate in micro/nano scale, the heat transfer theory in macro scale, Fourier heat equation, can not be used. But it can still be used in the substrate under TBCs. In this paper, the temperature field obtained from combining non-Fourier heat conduction model for TBCs and Fourier heat conduction model for substrate is used as the thermal load in the finite element analyses of thermal stress and J-integral of an edge crack in the TBCs. Influence of thermal diffusivity of substrate on the TBCs thermodynamic properties （temperature field, thermal stress and J-integral） is analyzed. The conclusion is that influence takes effect in the final thermal shock.

关 键 词：超薄热涂层 非傅立叶热传导 温度场 热应力 J积分 

分 类 号：O346.1[理学—固体力学] TS827[理学—力学]