激光辐照下热防护涂层烧蚀过程的数值分析  

Numerical analysis on ablation process of thermal protective coating under laser irradiation

作　　者：金珂[1] 卢鹉[1] 曾一兵[1] 罗正平[1] 赵立波[1] 

机构地区：[1]航天材料及工艺研究所,北京100076

出　　处：《功能材料》2015年第20期20128-20131,20133,共5页Journal of Functional Materials

摘　　要：针对热防护涂层材料开展了抗激光辐照实验研究,考察试片界面温度随时间的变化规律;在此基础上以传热学基本原理为基础,建立描述涂层内部传热传质、烧蚀化学反应以及表面迁移等过程数学模型并采用数值模拟的方法对模型进行求解,通过与实测值对比验证了模型的合理性,进一步考察涂层沿厚度方向的温度分布,分析了激光辐照过程中涂层表面迁移速率。研究结果表明,所建立的数理模型能够较好地描述涂层的烧蚀传热过程,涂层表面迁移速率在辐照初期逐渐升高而后逐渐趋于稳定,界面温度在短时间内急剧上升随后逐渐回落,同时增加涂层厚度以及降低材料导热系数有利于对基材的保护。The erosion experiments of the thermal protective coating were carried out and the interface temperature between coating and substrate was compared.According to the ablation process of protective coating,a transient mathematical model was developed to describe the surface ablation,interface migration,heat and mass transfer with ablation process in the protective coating.The model was numerical solved and validated by comparing the numerical results with the measured data.The temperature distribution along the thickness direction of the protect coating was pursued and the migration rate of coating surface was investigated.It was shown that the proposed model was suitable for describing the thermal process in protective coating,the migration rate of coating surface increases at the beginning and then reaches a steady state,meanwhile,the interface temperature increases at the beginning and then decreases.Some measures may be used to be good for protecting of substrate such as increasing the thickness,decreasing the thermal conductivity of the protective coating.The work in this paper was theoretically valuable for the further research and application of thermal protective coating.

关 键 词：防护涂层 数值模拟 烧蚀过程 界面迁移 

分 类 号：TB34[一般工业技术—材料科学与工程] TK124[动力工程及工程热物理—工程热物理]