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通过热重分析仪(TG)、X射线衍射(XRD)、拉曼光谱(Raman spectra)以及扫描电镜(SEM)等检测方法探索了不同炭化温度的中间相沥青基炭纤维在CO_2中的氧化特性。结果表明,在恒温氧化阶段,炭纤维失重率与氧化时间呈线性关系,较高炭化温度处理的中间相沥青基炭纤维,由于其较好的石墨微晶结构,抗氧化性能较好。炭纤维在CO_2中氧化烧蚀,会导致纤维表面形貌发生变化,随着反应进行,氧化反应向纤维内部扩散。在相同氧化条件下,炭化温度较高的炭纤维保持形貌能力更强。
The oxidation characteristics of mesophase pitch-based carbon fibers with different carbonization temperatures in CO_2 were investigated by TG, XRD, Raman spectra and scanning electron microscopy (SEM) . The results showed that there was a linear relationship between the weight loss rate of carbon fiber and oxidation time during the isothermal oxidation stage. The mesophase pitch-based carbon fibers treated with higher carbonization temperature had better oxidation resistance due to their better graphite microcrystalline structure. The oxidation and ablation of carbon fiber in CO 2 will result in the change of the fiber surface morphology. As the reaction progresses, the oxidation reaction will diffuse into the fiber. Under the same oxidation conditions, carbon fibers with higher carbonization temperature have better morphology.