Effects of heat treatment conditions on the thermal properties of mesophase pitch-derived graphitic foams

摘要

Carbon foam was first developed by researchers in the late 1960s as reticulated vitreous (glassy) carbon foams.More recently,Klett and coworkers at the Oak Ridge National Laboratory reported the first graphitic foams with bulk thermal conductivities greater than 58 W/m K;thermal conductivities up to 180 W/m K have recently been reported .By combining an open cellular structure with a thermal conductivity to weight ratio (gamma/rho) greater than 200 (as compared to 45 for copper),the development of high conductivity graphitic foam presents a unique opportunity to radically change the approach to many heat transfer problems.For many graphitic materials,the heating rate during graphitization is critical to optimizing the material properties.Therefore,in this project we examine the influence of heating rate during graphitization on key properties of the foam,such as density,thermal diffu-sivity,and crystallinity.