期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 34, 期 10, 页码 2163-2167出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.03.012
关键词
Precursors-organic; Electric conductivity; Activation energy; Carbon; SiBCN ceramics
资金
- National Energy Technology Laboratory
- Department of Energy of USA [DE-FE0007004]
- National Science Foundation of USA [CMMI-0927441, CMMI-1301099]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1301099] Funding Source: National Science Foundation
The electric conductivity of polymer-derived SiBCNs pyrolyzed at different temperatures was studied. We showed that the boron impeded the graphitization of the free-carbon phase in the SiBCN, leading to a higher characteristic temperature and activation energy as compared to the SiCN. Such an impeding effect is due to the interaction between h-BN and graphite phase. We also provided a credible evidence to show that the increase in the electric conductivity of the SiBCN with pyrolysis temperature is likely due to the increase in the conductivity of the free-carbon phase. (C) 2014 Elsevier Ltd. All rights reserved.
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