原料配比对石墨材料热传导性能的影响

以煅烧石油焦和煤沥青为基本原料，采用热压工艺制备了一系列石墨材料，考察了煅烧石油焦填料的粒度分布以及粘结剂用量对石墨材料的传导性能的影响，并阐明了粘结剂与填料粒子在热混捏与热压过程中相互作用原理。结果表明：石墨材料的传导性能不仅依赖于原料种类，粒度，而且与其质量配比有关，有最佳原料配比所制备的块状石墨具有高密度，低孔率，低电阻以及高导热等特点；填料煅烧石油焦颗粒以及粘结剂用量的过多或过少，都不利于石墨材料的传导性能，本文填料中最佳煅烧石油焦颗粒用量为25%，原料中最佳粘结剂含量为25%。

Effect of the composition of start materials on thermal conductivity of bulk graphite

The bulk graphite was prepared from raw materials of calcined coke and coal-tar pitch by the hot-pressing process in order that the effects of the binder and calcined coke grain content on the conductivity of the bulk graphite can been investigated. Experimental results show that bulk graphite of optimized composition for raw materials posses higher level of bulk density & thermal conductivity and much lower porosity & electrical resistivity compared with ones made from other raw materials. It is unfavorable for improvement of conductivity of the bulk graphite to use over more or less grain size and binder content. The optimized content of 25% was achieved for both grain of filler and binder of raw materials in the present studying. Based on the experimental results, the interaction mechanism of the calcined coke grain and the binder in the processes of hot-blinding and hot-pressing has been established.