黏结剂含量对碳基材料性能和结构的影响

以沥青焦、炭黑、人造石墨粉为骨料,以硫改性沥青为黏结剂,通过浆涂混合冷压炭化工艺,制备了一系列碳基体材料.考察了黏结剂含量对碳材料的物理性能和微观结构的影响.结果表明,碳材料的物理性能和微观结构与黏结剂含量有重要的关系;随黏结剂含量的增加,材料的密度和强度呈增大的趋势,而开孔率则逐渐下降;当黏结剂质量分数为44%时,材料的弯曲强度和压缩强度分别达到42.6 MPa和187 MPa;当黏结剂质量分数超过44%时,材料在炭化过程中破裂.这些变化可归因于黏结剂与骨料颗粒在热混捏和炭化过程中的相互作用机理.

Effect of Binder Content on Properties and Structure of Carbon Materials

Carbon materials are made from binder of modified pitch and fillers of pitch coke, carbon black and graphite powder by cold-pressing. Effect of binder content on physical properties and microstructure of carbon materials is investigated. Experimental results show that binder content plays an important role in physical properties and structure of carbon materials. With increasing of the binder content, the density and mechanical strength is increasing, and open porosity is decreasing. When the binder content is 44% in raw materials, the flexural and the compressive strength of the material are up to 42.6 MPa and 187.4 MPa respectively. However, when the binder content is above 44%, the material is cracked in the process of heat treatment. These changes are attributed to the interaction between binder and fillers when they are mixed and heat treated.