【摘要】 为了研究积木型变孔隙泡沫陶瓷的传热特性，采用稳态平面热源法，在分析热源温度对积木型泡沫陶瓷接触热阻影响的基础上，给出了孔密度梯度、厚度梯度和平均孔径对积木型泡沫陶瓷有效导热系数的影响变化规律．结果表明：积木型泡沫陶瓷的接触热阻，随着热源温度的增加而降低，接触热阻占比也随之降低，减小幅度最大可达10.2%；在沿热流方向孔密度梯度变化相同时，随着积木型泡沫陶瓷平均孔径逐渐增加，有效导热系数也随之增加；当平均孔径相同时，沿热流方向孔密度递减而厚度递增型的积木型泡沫陶瓷有效导热系数最大；与沿热流方向孔密度梯度变化影响相比，积木型泡沫陶瓷平均孔径变化影响相对较小．更多还原

【Abstract】 To investigate the heat transfer characteristics of block-type variable porosity foam ceramics,the steady-state plane heat source method was employed. This study analyzed the influence of heat source temperature on the contact thermal resistance of block-type foam ceramics,based on which the effects of pore density gradient,thickness gradient and average pore size on the effective thermal conductivity of block-type foam ceramic were explored. It was found that the contact thermal resistance of block-type foam ceramics decreases as the heat source temperature increases,with the maximum decrease reaching 10.2%. Moreover,when the pore density gradient aligns with the direction of heat flow,the effective thermal conductivity of block-type foam ceramics increases with the average pore diameter. Under a constant average pore diameter,the block-type foam ceramics in the heat flow direction,with a decreasing pore density gradient and an increasing thickness,has the highest effective thermal conductivity. Compared to the impact of changes in pore density gradient,variations in the average pore diameter exert a relatively small effect on the effective thermal conductivity of block-type foam ceramics.更多还原