利用沥青在热解过程中产生挥发性气体自发泡和高压渗氮的原理,以石油中间相沥青为原料,采用高压反应釜制备炭泡沫材料.用SEM和偏光显微镜观察了材料的孔结构,分析了制备条件对炭泡沫结构的影响.结果表明,温度和压力是影响炭泡沫材料结构的重要因素,在实验条件范围内,较高的反应温度和压力有利于制备出较高性能的炭泡沫,其气孔率较高,韧带炭层排布规则.
A carbon foam was prepared from petroleum mesophase pitch in a high pressure/high temperature reactor by self-bubbling of volatile gas and infiltration of nitrogen at high pressure. The carbon foam was characterized by SEM and light microscopy. It was found that temperature and pressure are important factors in determining the carbon foam structure. Higher temperature tends to enlarge pore size and increase the percentage of open porosity. Increasing pressure decreases pore apertures size and improves density. A highly regular arrangement of carbon layers along the filament can be obtained at high temperature.
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