制备工艺对中间相沥青基泡沫炭结构的影响  

Effect of preparation conditions on the structure of mesophase pitch-based carbon foams

作　　者：陈青香[1] 李铁虎[1] 庄强[1] 李风娟[1] 程有亮[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《炭素技术》2010年第4期5-8,20,共5页Carbon Techniques

基　　金：高等学校博士点基金项目(20060699028);西北工业大学研究生创业种子基金项目(Z200913)

摘　　要：以煤沥青基中间相沥青为前驱体制备泡沫炭生料,经850℃和2300℃热处理分别得到炭化和石墨化泡沫炭,研究了发泡工艺参数和热处理温度对泡沫炭微观结构的影响。结果表明,较快的升温速率使泡沫炭易形成开孔型结构;随着压力的增大,泡沫炭的孔径减小、密度增大、孔隙率降低;经炭化和石墨化后泡沫炭孔径有所收缩,孔间的连通性增强;泡沫炭石墨化后孔壁及其韧带大部分转化成为高取向度的石墨晶体结构,微晶层间距和石墨化度分别为0.3376nm和0.733。Mesophase pitch derived from coal tar pitch was used as the precursors to prepare carbon foams crude,and then the green foams were carbonized and graphitized at 850 ℃ and 2 300 ℃ respectively.The influences of foaming and heat treatment parameters on microstructures of the foams were investigated.The results showed that the more heating rate was faster,and the open-cell-structure of carbon foam was obtained easily.With the foaming pressure increasing,the pore size and the porosity of the carbon foam obtained were all decreased,but the density was increased.Through carbonization and graphitization,the pore size of carbon foam was reduced and the connectivity among pores was enhanced.The most pore walls and the carbon foams ligament were transformed into the highly oriented graphite crystal structure.The layer distance of the crystal structure and the graphitization degree were 0.3376 nm and 0.733 respectively.

关 键 词：中间相沥青 泡沫炭 炭化 石墨化 微观结构 

分 类 号：TB383[一般工业技术—材料科学与工程] TQ522.63[化学工程—煤化学工程]