등방 흑연 블록 제조를 위한 산화염료 기반 in situ 함침공정 연구

초록

This study investigated in situ impregnation of bulk graphite blocks using an oxidativedye as a impregnating agent under normal pressure and compared impregnationbehaviors with conventional pitch impregnation. Three different graphite blocks with low,medium, and high density were impregnated with pitch and oxidative dye. When threetypes of graphite blocks were impregnated using both pitch under normal pressure andoxidative dye via in situ impregnation, the density increase was consistently higher ingraphite blocks impregnated with pitch under normal pressure. However, the impregnationbehaviors exhibited difference between the conventional pitch impregnation and thenovel oxidative dye based in situ impregnation. The pitch-impregnated blocks had difficultypenetrating the inner regions under normal pressure, resulting in more impregnationon the outer regions, due to the high viscosity of molten pitch. On the other hand, whenusing oxidative dye in situ impregnation, more impregnation into the the interior of theblocks were observed. Since oxidative dye impregnation material is in a low-viscosity aqueousstate, it can easily penetrate into the block's inner regions even under normal pressure. Considering this impregnation behavior, even with the lower density increase in the in situimpregantion, it can be an effective way as a novel impregnation method for bulk graphiteblock manufacturing process.

키워드