Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第25卷    第1期    总第190期    2015年1月

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Effects of deposition conditions on microstructures of low temperature isotropic pyrocarbon
ZHANG Jian-hui,XIA Wen-li

School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

Abstract:The low temperature isotropic pyrocarbon (LTIC) was prepared by a quasi-steady-state fluidized bed chemical vapor deposition (FBCVD) at deposition temperature of 1250-1450 ℃ with propane at different concentrations. The effects of deposition temperature and propane concentration on the microstructure of the LTIC were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the deposition temperature and propane concentration have great influence on the fracture surfaces and texture of LTIC. As the deposition temperature and propane concentrations raising, the fracture surfaces of LTIC change from laminar structure to globular-like structure with decreasing the density and texture, which are correlated to variations in the tortuosity of the aromatic carbon layers. The increase of the density and nucleation rate is an important way to get isotropic pyrocarbon with excellent properties, when the deposition temperature is controlled at 1350 ℃ with 25%-40% propane concentrations, the structures and properties of LTIC are excellent.

 

Key words: low temperature pyrocarbon; isotropic; deposition condition; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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