新型导热材料石墨泡沫具有很好的热物理性质.文中应用分形理论讨论了这种新型多孔材料的分形特性,并在此基础上建立了石墨泡沫材料的导热模型.采用热阻法给出了石墨泡沫材料的等效导热系数的关系式.在空腔边长为200～500μm,对应的体孔隙率为82%～73%条件下,计算了石墨泡沫的体积分形雏数和等效导热系数.这种新的研究方法对多孔材料热物性研究有一定指导意义.

The new material of graphite foam is a good thermal-conductivity material. With fractal theory, the fractal character of this novel porous material is discussed. Then a thermal-conductivity model of graphite foam is proposed. The relationship formula of effective thermal conductivity is presented by using thermal resistance method. The volume fractal dimension and effective thermal conductivity of this material are calculated. This new method for calculation is significant for porous material.

TK124

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