The Preparation Research And Numerical Analyse Of Graphite Foam

With the rapid development of aeronautics and space, automobile, communication and information industries, it has put forward some more severe requirements in the field of modern materials, such as high thermal conductivity, erode resistant and good mechanical properties. In order to meet them, the graphite foam material on behalf of the heat conduction technique with new materials has appeared.The graphite foam is a porous material, which owns the excellent thermal-physical performance of small density and great thermal conductivity. Using the graphite foam material to produce a variety of radiators could greatly decrease the weight and volume of the radiators. Nowadays, though the international studies are more superior, most of the internal studies are on the beginning phase about preparation process of the graphite foam.In this paper, the influence to the structure and performance of the porous graphite foam under control of several parameters during preparation experiment was investigated. Different samples were obtained through changing pressure, temperature rising rate and time of constant temperature.For experimental optimization, a pores'distribution uniformity coefficient based on the standard deviation of pores'sectional area was presented as a synthetical index to estimate the uniformity of size and distribution of pores for porous materials. The conception, definition and measuring of the pores'distribution uniformity coefficient was introduced, the influence of different experimental conditions on the pores'distribution uniformity coefficient of the graphite foam was also discussed.ANSYS, a finite element software was used to modeling and numerical analysis for the graphite foam. The bulk thermal conductivities were calculated for different porosity models. Furthermore, the temperature distribution and heat flux distribution of the models were analyzed and compared to current relative results.