【摘要】 将高温煤沥青、中温煤沥青、浸渍剂沥青在常压下炭化,经2 300℃石墨化处理,制备3种煤沥青炭。利用扫描电子显微镜(SEM)观察煤沥青炭的显微结构;采用X射线衍射法(XRD)检测煤沥青炭的石墨化度;通过氮吸附法测定煤沥青炭的比表面积(SBET);采用热重(TG/DTG)分析手段测试并分析煤沥青炭的氧化性能。研究结果表明:煤沥青的族组分影响煤沥青炭的形貌,喹啉不溶物含量低有利于流线型结构的形成;高温煤沥青炭微观结构主要以流线型和镶嵌型为主,中温煤沥青炭和浸渍剂沥青炭以流线型为主,但浸渍剂沥青炭流线型结构取向性好;煤沥青炭中含有流线型结构越多,则其石墨化度越高,比表面积越低;煤沥青炭的氧化失重主要发生在700~900℃,浸渍剂沥青炭的抗氧化性能最好。更多还原

【Abstract】 Using high temperature pitch,medium temperature pitch and impregnating pitch,three kinds of coal-tar pitch carbon were prepared by carbonization at atmospheric pressure and graphitization at 2 300 ℃ successively.Their microstructures,graphitization degree and specific surface area(SBET) were investigated by scanning electric microscopy(SEM),X-ray diffraction(XRD) and nitrogen adsorption respectively.Finally,the oxidation properties of the three kinds of carbon were tested by thermogravimetric.The results show that the component of coal-tar pitch affects the microstructure of coal-tar pitch carbon.Lower content of quinoline insoluble(QI) will benefit the forming of flow domain type structure.Carbon derived from high temperature pitch mainly includes flow domain type and grain mosaics type microstructures,while that derived from medium temperature pitch and impregnating pitch are mainly in flow domain type microstructure,but the latter is better in orientation.With the increase of content of flow domain type texture,the graphitization degree increases,but SBET decreases.Oxidation of coal-tar pitch carbon mainly occurs at 700?900 ℃ and the oxidation resistance of impregnating pitch carbon is the best among them.更多还原