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分别利用炭黑、石油焦、针状焦和天然石墨粉为填料,煤沥青为黏结剂,经模压成型(150MPa,10min)、炭化(1300℃,1h)和石墨化(2300℃)制备炭/石墨材料。考察了填料类型对最终炭/石墨材料物理性能和微观结构的影响。研究结果表明:利用炭黑为填料所制材料具有较高的机械强度,但其导热和导电性能相对较差;经石墨化后(2300℃),其抗弯和抗压强度分别达到88.0和173.2MPa。而以天然石墨粉为填料所制材料具有较好的导热和导电性能,在室温下其导热率达到278W/m·K;另外,其抗弯和抗压强度分别达到51.1和90.2MPa。微观结构分析表明,以天然石墨粉为填料所制得的材料具有最大的微晶尺寸和高度的取向性。
Carbon black / petroleum coke, needle coke and natural graphite powder were respectively used as filler and coal tar pitch as binder to prepare carbon / carbon black powder by molding (150MPa, 10min), carbonization (1300 ℃, 1h) and graphitization (2300 ℃) Graphite material. The effect of filler type on the physical properties and microstructure of the final carbon / graphite material was investigated. The results show that the material prepared by using carbon black as filler has high mechanical strength, but its thermal conductivity and electrical conductivity are relatively poor. After graphitization (2300 ℃), the bending strength and compressive strength reach 88.0 and 173.2 MPa. The natural graphite powder as filler material has good thermal conductivity and electrical conductivity, its thermal conductivity at room temperature reached 278W / m · K; In addition, the bending and compressive strength of 51.1 and 90.2MPa, respectively. Microstructure analysis showed that the natural graphite powder as a filler material obtained with the largest crystallite size and high degree of orientation.