高定向石墨块的控制制备及其导热性能影响因素研究

发布时间：2018-04-08 13:10

  本文选题：石墨块　切入点：高定向　出处：《无机材料学报》2017年06期

【摘要】：以廉价易得的高结晶度天然鳞片石墨(NG)和中间相沥青为原料,采用中温热模压一次成型再高温炭化、石墨化处理可以制备高密度、高定向、高导热石墨块体材料。XRD、SEM和PLM分析表明该石墨块具有高度择优取向结构,其内部石墨片垂直热压方向有序堆积排列。原料中鳞片石墨和沥青粘结剂的组成和配比以及制备工艺参数等对所制石墨材料的面向导热性能有显著影响。采用86wt%+32目鳞片石墨和14wt%AR中间相沥青在500℃、10 MPa下热模压成型的炭块经1000℃炭化、2800℃石墨化后样品的热物理综合性能较好,其体积密度达到1.91 g/m3以上,室温面向热导率为550 W/(m·K),3000℃石墨化室温面向热导率高达620 W/(m·K)。
[Abstract]:High density and high orientation can be prepared by graphitization treatment by using low cost and easy to get high crystallinity natural flake graphite (NGG) and mesophase asphalt as raw materials.SEM and PLM analysis of high thermal conductivity graphite bulk material show that the graphite block has highly preferred orientation structure and its internal graphite sheet is arranged in the vertical hot pressing direction of ordered stacking.The composition and proportion of flake graphite and bitumen binder, as well as the preparation process parameters, have a significant effect on the thermal conductivity of the graphite materials.The thermal and physical properties of the carbon block formed by hot moulding at 500 鈩，

本文编号：1721758