炭化过程中竹质碳纤维原丝微结构的变化

Study on Microstructure Change of Fibers of Bamboo Carbon Fiber from Liquefied Bamboo during Carbonization

对炭化温度在300～1 000℃之间的竹质碳纤维原丝进行研究,结果表明:原丝在300～1 000℃之间均出现了(002)衍射峰和(100)衍射峰,且随炭化温度的升高原丝难以石墨化,但其类石墨微晶结构随着炭化温度的升高逐渐趋于规整和有序。300～600℃是原丝孔隙结构发生显著变化的区间,600～1 000℃间原丝的孔隙结构变化较小;300℃以下原丝的热失重率为5.07%,300～600℃间的热失重率达到41.20%,600～1 000℃间的热失重率仅为3.33%。

XRD,mercury indicator and TGA were used to study fibers of carbon fiber from liquefied bamboo during carbonizing at 300-1 000℃,the results showed that both（002） crystal plane diffraction peak and（100） crystal plane diffraction peak appeared in the fibers at 300-1 000℃,moreover,with rising of carbonization temperature, it was difficult for the fibers to be graphitized,but their graphite-like crystal structure became regular and orderly.The fibers porous structure changed obviously at 300-600℃,while their porous structure had smaller change at 600-1000℃.The rate of weight loss of fiber was 5.07% below 300℃,its rate of weight loss reached 41.20% at 300-600℃,and was only 3.33% at 600-1 000℃.