中间相沥青基泡沫炭的气泡生长过程(英文)  

Bubble growth in the preparation of mesophase-pitch-based carbon foams

作　　者：王妹先[1] 王成扬[1] 陈明鸣[1] 李同起[2] 胡子君[2] 

机构地区：[1]天津大学化工学院,绿色合成与转化教育部重点实验室,天津300072 [2]航天材料及工艺研究所,先进功能复合材料技术国防科技重点实验室,北京100076

出　　处：《新型炭材料》2009年第1期61-66,共6页New Carbon Materials

基　　金：国家973项目(2006CB600907)~~

摘　　要：以AR合成中间相沥青为原料,在不同的温度下发泡制得了泡沫炭。采用扫描电镜和光学显微镜等分析手段对中间相沥青基泡沫炭的气泡生长机理进行了初步研究,讨论了温度对泡孔结构的影响。结果表明,当温度从480℃升至540℃时,平均泡孔直径从500μm升到800μm。最初形成的泡沫在熔融沥青中分布不均匀,汇集在沥青的上表面;气泡在Z轴方向的形状是椭球形,在Z轴垂直方向为球形。中间相沥青基泡沫炭气孔的形状和泡沫的体积密度密切相关。形成的泡沫体在Z轴方向存在明显的体积密度梯度。A synthetic mesophase pitch from naphthalene was used as a precursor to prepare carbon foams under different temperatures in order to study the bubble growth process and the effect of temperature on the bubble shape during the formation of carbon foams. Scanning electron microscopy and optical inicroscopy were used to analyze the microstructure of the as-prepared foams. Results show that the bubble size increases from 500 μm to 800 μm when the temperature increases from 480 ℃ to 540 ℃. The initial bubbles are not uniformly dispersed in the molten pitch, but start to grow at the upper section of the pitch. The cross-section bubble shape in the direction of gravitational forcey is elliptical but perpendicular to the direction it is circular. The non-spherical shape of the bubble is closely related to the bulk density of the mesophase-pitch based carbon foams, and there is a bulk density gradient in the Z direction of the as-prepared foam.

关 键 词：中间相沥青 发泡 开孔率 光学显微镜 

分 类 号：TB383.4[一般工业技术—材料科学与工程]