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Deposition kinetics and mechanism of pyrocarbon for electromagnetic-coupling chemical vapor infiltration process

Journal of Materials Science & Technology 2022年第6期101卷 118-127页

作者： Chenglong Hu Rida Zhao Sajjad Ali Yuanhong Wang Shengyang Pang Jian Li Sufang Tang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Department of Physics Southern University of Science and TechnologyShenzhen 518055China The 31st Research Institute of China Aerospace Science and Industry Corp Beijing 100074China

Although the electromagnetic-coupling chemical vapor infiltration(E-CVI)has been proven of a highefficiency technique for producing carbon fiber reinforced pyrocarbon(Py C)matrix(C/C)composites,a deep understanding of the deposition kinetics and mechanism of Py C matrix is still *** this work,a deposition model with uniform electric field but gradient magnetic field was set up by using unidirectional carbon fiber bundles as the substrates to investigate the deposition kinetics and ***,the polarizability,and the chemical adsorption and dehydrogenation barriers of hydrocarbon were simulated based on the density functional theory(DFT)and the Climb-image nudged elastic band method,*** E-CVI process exhibited extremely high Py C deposition rates of 8.7,11.5,16.5 and 22.7 nm/s at 700,750,800 and 850℃,respectively,together with a significantly low apparent activation energy of 57.9 k J/mol within the first 5 *** Py C deposited at different temperatures with different time shows a smooth laminar structure with low coherent length and graphitization *** theoretical calculation and simulation results indicated that the electrons existing on the carbon fibers and the accelerated motion of radicals with preferred orientation forced by the derived magnetic field have reduced the energy barrier for the deposition process,thereby resulting in low apparent activation energy and high Py C deposition *** results of this work may shed a light on how to better direct the preparation of C/C composites by E-CVI process with high quality and efficiency.

关键词： electromagnetic-coupling chemical vapor infiltration CVI C/C composites Deposition mechanism

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