【摘要】 热障涂层制备工艺不同,微结构不同,基于四参数随机生长方法,构造了各向同性热障涂层微结构,各向异性的层状和柱状热障涂层的微结构。利用热阻网络法开发了多孔涂层材料导热计算程序,针对上述3种不同微结构YSZ热障涂层的有效导热系数进行二维数值计算。通过与理论求解的串并联模型的模拟结果对比,验证了本文方法的有效性。计算结果表明,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,孔隙直径对涂层导热系数无显著影响;层状结构隔热能力显著强于柱状结构。更多还原

【Abstract】 The thermal barrier coatings made by different preparing process have different micro-structure,the quartet structure generation set( QSGS) has been proposed to generate the micro-structure of isotropic and anisotropy thermal barrier coatings,the anisotropy model contain layered structure and columnar structure. The composite’s heat conductivity analysis program was developed by using the thermal resistance network method; the numerical calculation of the thermal conductivity of the three structures has been simulated. This method has been used to solve the paralleled and series model of the composites,the result match with the theory solution fairly good. The calculation results show: increasing the porosity of the coating was an effective way to improve the heat insulation ability; the pore diameter makes no significantly difference to the thermal conductivity of the coatings; the layered structure was superior to the columnar structure in heat insulation.更多还原