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利用自行设计的化学气相沉积(CVD)炉,以丙烯为碳源,氢气和氩气为载气,采用固定基体CVD法制备各向同性热解炭块体材料。通过恒温氧化实验对所获得的各向同性热解炭材料的低温(450℃)氧化行为进行研究,并与碳纳米管、炭黑和天然鳞片石墨进行比较。利用拉曼光谱(Raman)、扫描电镜(SEM)和透射电镜(TEM)等分析手段对氧化前后试样的表面形貌和微观结构进行表征。结果表明,炭材料的氧化特征与其内部的缺陷种类和密度密切相关,其中各向同性热解炭的抗氧化性能优于其他3种炭材料,其低温氧化过程服从直线规律,氧化反应主要发生于内部的条带状热解炭结构。
The isotropic pyrocarbon material was prepared by fixed matrix CVD method using a self-designed chemical vapor deposition (CVD) furnace with propylene as the carbon source, hydrogen and argon as the carrier gas. The isothermal oxidation experiments of the obtained isotropic pyrocarbon materials were studied at low temperature (450 ℃) and compared with those of carbon nanotubes, carbon black and natural flake graphite. The surface morphology and microstructure of samples before and after oxidation were characterized by Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the oxidation characteristics of carbon materials are closely related to their internal defect types and densities. The isotropic pyrolytic carbon has better oxidation resistance than the other three carbon materials. The low temperature oxidation processes follow the linear rule. The oxidation reaction mainly occurs in Internal ribbon-like pyrolytic carbon structure.