中间相沥青的预氧化对石墨化泡沫炭微裂纹的影响

Effect of preoxidation on microcracks in graphite foams

通过对萘系中间相沥青进行预氧化处理,研究族组成变化对石墨化泡沫炭微结构的影响机制。结果表明:中间相沥青经过预氧化处理后,喹啉不溶物含量提高、族组成分布变窄,导致石墨化过程中泡沫炭泡孔的孔壁、韧带处热应力的梯度差异变小,进而使得微裂纹的数量、长度及间隙减小。

The formation mechanisms of microcracks in graphite foams were investigated by varying the preoxidation temperature of the precursor mesophase pitch. Results indicated that after the mesophase pitch was preoxidized, its quinolineinsoluble component became the dominant fraction, which leads to a decrease in heat stress gradient and as a result, a decrease in the amount, length and width of microcracks.