摘要
将高温煤沥青和浸渍剂沥青在92M Pa下炭化,在2 500℃下对所得沥青炭进行石墨化处理;测试了所得沥青炭的体积密度、开孔率、比表面积(SBET);利用扫描电子显微镜(SEM)观察了所得沥青炭的显微结构;利用X射线衍射方法(XRD)检测了所得沥青炭石墨化处理后的石墨化度;测试了所得沥青炭的氧化性能;测试了沥青炭试样的比热容、导热系数、热扩散率和线膨胀系数。结果表明:在92M Pa下,两种沥青炭有着相近的密度和开孔率;浸渍剂沥青炭的SBET高于高温煤沥青炭;浸渍剂沥青炭为流线型结构,高温煤沥青炭为镶嵌型和域型并存的结构;流线型结构沥青炭石墨化度较高;高温煤沥青炭的抗氧化性能要好于浸渍剂沥青炭;随着沥青炭石墨化程度的增大,比热容、导热系数、热扩散率都增大,而线膨胀系数减小。
Pitch derived carbons were prepared by carbonization and graphitization of high temperature pitch and impregnating pitch at 92MPa and 2 500℃. Bulk density,porosity and specific surface area （SBrr）were determined. Scanning electron microscopy （SEM） was used to observe the morphology of pitch derived carbons. X--ray diffraction method was used to analysize the graphitization degree of pitch derived carbons. Oxidation resistance was tested. Specific heat volum,heat conductivity, thermal diffusion ratio and linear expansion coefficient were tested. The results indicated that the bulk density and porosity of two pitch derived carbons is close at 92MPa,Snzr of impregnating pitch carbon is higher than high temperature pitch carbon. The microstructure of impregnating pitch carbon show flow domain type, but high temperature pitch carbon show grained mosaics type and field type. The graphitization degree with flow domain type texture is higher. The oxidation resistance of high temperature pitch carbon show well. The Specific heat volum,heat conductivity,thermal diffusion ratio increase and linear expansion coefficient decrease with an increase of graphitization degree of pitch derived carbon.
出处
《炭素》
2006年第4期31-35,共5页
Carbon
基金
十一五国家重点基础研究发展规划项目(2006CB600902)
关键词
沥青炭
结构
石墨化度
氧化性能
热性能
pitch derived carbon
structure
graphitization degree
oxidation resistance
thermo--physical properties
