Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 2, Pages 477-484Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.08.020
Keywords
Precursor-organic; Electron microscopy; Microstructure-final; Porosity; Carbon-rich polymer-derived SiCN ceramic
Categories
Funding
- German Research Foundation (DFG) [SPP 1299]
- MWN (Materials World Network) of the DFG
- National Science Foundation
- LOEWE-Zentrum AdRIA (Adaptronik-Research, Innovation, Application)
- state of Hesse, Germany
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Herein we report on the thermal decomposition of SiCN polymer-derived ceramics leading to materials with high specific surface area and defined pore sizes. The ceramics were obtained by means of pyrolysis of a carbon-rich poly(diphenylsilylcarbodiimide) precursor and by varying the thermolysis parameters, namely temperature, annealing time and using additional annealing steps. The thermal decomposition of SiCN ceramics is correlated with the carbothermal reaction of amorphous silicon nitride phase with excess carbon and this detrimental event leads to high specific surface area up to 568 m(2) g(-1) and micro- and mesopores formation in these materials. High-resolution TEM investigations have confirmed that the pores are embedded only in the carbon phase. Moreover, the relationship between the pore sizes and the organization of free carbon phase is discussed. (C) 2011 Elsevier Ltd. All rights reserved.
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