加热条件对炭泡沫材料孔结构和性能的影响(英文)  

Effect of heating conditions on pore structure and performance of carbon foams

作　　者：王永刚[1] 闵振华[1] 曹敏[1] 许德平[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《新型炭材料》2009年第4期321-326,共6页New Carbon Materials

基　　金：National Natural Science Foundation of China(50274071)~~

摘　　要：以AR沥青为原料,利用高压釜在不同恒温条件下制备了炭泡沫,并测定了其孔结构、体积密度、显气孔率、压缩强度、常温热导率以及微晶参数。结果表明:相对于短恒温时间,长恒温时间制得的炭泡沫孔径大(412nm)、显气孔率高(83.82%)、体积密度小(0.34g/cm3)、压缩强度高(4.92MPa),多孔连通结构更丰富。经过石墨化处理后,石墨泡沫呈现出较高的常温热导率(71.34W/(m.K))和较小的层片间距d002(0.33556nm)。石墨泡沫的常温比导热率能达到210(W.(m.K)-1)/(g.cm-3),是铜的5倍,铝的4倍。Carbon foams were prepared from AR pitch in a high pressure/high temperature reactor under different heating conditions. Their pore structure,bulk density,porosity,compressive strength,thermal conductivity,and crystallite size parameters were measured. Foams produced using a long time at a constant foaming temperature exhibit bigger pore size （412 nm）,higher porosity （83.82%）,lower bulk density （0.34 g/cm3）,higher compressive strength （4.92 MPa）,and more interconnected pores than that produced in a short time at the same constant foaming temperature, which exhibit high thermal conductivity （71.34 W/（m-K） ） and low interlayer d-spacing （don） （0. 335 56 nm） after graphitization at 2 800 ℃（2. The specific thermal conductivity of graphite foams can reach 210 （W. （m. K）^-1/（ g·cm^-3）, which is about five times greater than copper and four times greater than aluminum.

关 键 词：炭泡沫 恒温条件 孔结构 性能 

分 类 号：TQ127.11[化学工程—无机化工]