不同组分煤沥青中间相形成过程及炭结构分析  

Analysis of Formation Processes of Mesophase Spheres and Pitch-derived Carbon of Coal-tar Pitch with Different Components

作　　者：吴书锋[1] 刘建军[1] 邹武[1] 程文[1] 

机构地区：[1]西安航天复合材料研究所,西安710025

出　　处：《材料导报（纳米与新材料专辑）》2008年第1期388-390,共3页

基　　金：973项目(2006CB600902)

摘　　要：采用热台偏光显微镜对2种组分不同的煤沥青升温至550℃的中间相的形成过程进行观察。结果表明:2种煤沥青中间相的形成过程存在差别,原生喹啉不溶物(PQI)对中间相的形成有明显的影响。PQI控制着中间相小球的成核,而且控制着中间相小球的融并。高PQI煤沥青中间相的形成有成核、长大、融并的过程,到550℃左右时复球解体形成域型结构和镶嵌型结构并存的沥青炭。低PQI煤沥青在升温初期没有发现中间相小球,随着温度的升高,在熔融沥青边缘处迅速出现沟槽状结构,并迅速扩展至整个平面,形成流线型沥青炭结构。Two kinds coal-tar pitch which have different primary QI contents are heated to 550℃ in hot stage,and the formation processes of mesophase are observed through polarized optical microscopy. The result shows that there are different formation processes in carbonization behavior between coal-tar pitches. The PQI affects the for- mation of mesophase spheres in evidence. PQI controls not only the coalescence of mesophase spheres but also the nu- cleation of new spheres. The formation of mesophase for high content PQI coal-tar pitch is provided with the processes of nucleation, growth and coalescence. When the temperature gets to 500℃, the spheres disaggregate, and form the pitch-derived carbon with the texture of domain type and mosaic type. However, during the early stage of carbonization of low PQI content coal-tar pitch, there is no sphere can be observed, With the temperature raises, lots of grooves appear rapidly at the edge of melted coal-tar pitch, then extend to the whole plane, and form the pitch-derived carbon in the form of sheet.

关 键 词：中间相 热台 偏光显微镜 煤沥青 喹啉不溶物 

分 类 号：TQ522.65[化学工程—煤化学工程] O342[理学—固体力学]