【摘要】 等离子熔射快速制模中 ,由于熔射工艺本身的特点 ,熔射涂层具有一定的孔隙。本文中 ,作者采用基于元胞(U nit Cell)的有限元数值方法 ,直接计算涂层宏观等效热传导系数与细观球形多孔结构的联系 ,计算了不同孔隙率下材料等效热传导系数的变化。并与基于匀质化理论 (Homogenization Theory)和多孔材料理论计算公式得到的等效热传导系数作了对比 ,分析了计算结果。这对于找到影响熔射层质量的基本规律 ,为熔射快速制模工艺参数的合理设计和熔射质量的诊断分析提供了科学依据更多还原

【Abstract】 In rapid plasma spray tooling (RPST), there are pores in the plasma sprayed coating that can not be avoided because of the spraying process itself. In this paper, we calculated the relationship between the macro effective thermal conductivity (ETC) of plasma sprayed coating and the meso spherical pore structure. ETCs of structures with different porosity have been calculated. We also compared the results with that calculated by the homogenization theory as well as by the theoretical formulas. The results have been analyzed. All this can help to find the basic rules affecting the quality of plasma sprayed coating, and to provide scientific foundations that can help to optimize the parameters of RPST process and diagnose the quality of coating.更多还原