High-temperature heat treatment of carbon microcoils obtained by chemical vapor deposition process and their properties
High-temperature heat treatment of carbon microcoils obtained by chemical vapor deposition process and their properties
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化学气相沉积法碳微线圈的高温热处理及其性能
DOI：
10.1557/jmr.2000.0115
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发表时间：
2000
影响因子：
2.7
通讯作者：
S. Motojima
中科院分区：
文献类型：
--
作者：
Xiuqin Chen;W. In;S. Shimada;M. Fujii;H. Iwanaga;S. Motojima
将770℃催化乙炔热解得到的碳微线圈在CO + CO_2气氛中，3000℃热处理6 h。研究了热处理对合金形貌、组织和性能的影响。热处理后碳卷的卷曲形态基本保持不变，但变脆。形成线圈的两根纤维的断裂截面一般呈三角锥体状或负锥体空心。这些典型的断裂模式说明了碳卷的生长机理。热处理后形成了相对于纤维轴倾斜10 ~ 40°的不同石墨层（d = 0.339 nm），形成了“人字形”结构。体积电阻率为10-0.1 Ωcm，密度为2.2077 ~ 2.087 g/cm^3，比表面积为6 ~ 8 m^2/g。
Carbon microcoils obtained by the catalytic pyrolysis of acetylene at 770 °C were heat treated at 3000 °C for 6 h in a CO + CO_2 atmosphere. The effect of the heat treatment on the morphology, microstructure, and properties was examined. The coiling morphology of the carbon coils was almost preserved even after the heat treatment, though it became brittle. The ruptured cross section of the two fibers, which form the coils, generally has either a trigonal pyramidlike form or negative pyramidal hollow. These characteristic ruptured patterns demonstrate the growth mechanism of the carbon coils. Distinct graphite layers ( d = 0.339 nm) were developed by the heat treatment with an inclination of 10–40° versus the fiber axis to form a “herringbone” structure. The bulk electrical resistivity, density, and specific surface area were 10–0.1 Ωcm, 2.2077–2.087 g/cm^3, and 6–8 m^2/g, respectively.