The Influence of Deposition Parameters on the Microstructure and Deposition Mechanism of Low-temperature Isotropic Pyrocarbon on a Bed of Fluidized Particles
ZHANG Jian-hui
RUAN Ye-peng
LUO Bi-hui
ZHENG Yan-zhen
1.School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China2.School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China3.School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China4.School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China
摘要：To investigate the microstructure and deposition mechanism of low-temperature isotropic pyrocarbon (LTIC), chemical vapour deposition was conducted in a steady-state fluidized bed using different propane concentrations and deposition temperatures. The microstructure of LTIC obtained at different deposition conditions was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that LTIC is composed of both globular-like and laminar structures. Increasing the deposition temperature is propitious for decreasing the nucleation barrier-forming pyrocarbon in vapour, causing the quantity of spherical particles with a smaller diameter to increase and the texture of the outer layer around carbon blacks inside the spherical particles to decrease gradually. Increasing the propane concentration also made the globular-like fracture morphology more obvious and caused the laminar structure to gradually disappear. Pyrocarbon formation is dominated by a surficial growth mechanism at lower propane concentrations, while gaseous nucleation mechanism is more dominant at higher propane concentrations.
机标关键词：
分类号：TQ153(电化学工业)
论文发表日期：2019-12-30
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：10( 145-154 )
英文信息