在宇航应用中,对石墨材料的抗热应力要求甚高,这就要求石墨材料具有低膨胀和高破坏应变。通常人造石墨是由煅后或石墨化后的焦粒作骨料加有机炭氢粘结剂制造的,因此,在热处理到石墨化过程中,骨料收缩小或者没有收缩,而粘结剂从炭氢化合物变为炭和石墨结构收缩较大,这样制得的最终产品带有许多裂纹。这种形态,很明显削弱了总的结构和抵抗应力的能力。 C.R.Kennedy提出了一种解决办法,即采用从焦炭塔直接获得的生焦直接作为骨料,这样骨料表面能保持化学活性,易于与粘结剂结合;另一方面,热处理过程中骨料和粘结剂 In aerospace applications, graphite materials require very high thermal stress, which requires graphite materials with low expansion and high failure strain. Artificial graphite is usually made from calcined or graphitized coke grains as an aggregate plus organic hydrogen binder so that during heat treatment to graphitization the aggregate shrinks with little or no shrinkage and the binder changes from The carbon-hydrogen compounds turn into carbon and the graphite structure shrinks more and the resulting end-product thus produced carries a lot of cracks. This form, obviously, weakened the overall structure and ability to resist stress. CR Kennedy proposed a solution that uses raw coke obtained directly from the coke drum as the aggregate directly so that the aggregate surface remains chemically active and easily bonds with the binder. On the other hand, aggregate and Binder