利用激光拉曼光谱的方法,研究了国产PAN基碳纤维CCF300在石墨化过程中碳化学结构的变化规律.通过对散射谱图进行分峰分析,根据不同振动峰的归属,提出了sp2结构转化度α,即IG/IG+IC这一表征纤维由碳纤维向石墨材料转变进程的结构参数.结果表明:随着处理温度的不断升高,纤维中的无序碳结构逐渐减少,在1 700℃之前sp3杂化向sp2杂化结构转变的速率较快;在1 700℃之后,转变速率明显变慢,逐步形成了最终石墨纤维的规整六元环结构基础.
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