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Oxygen Sinks in SiC-Based Ceramics

Published online by Cambridge University Press:  22 February 2011

Wolfgang Braue ,
K. Das Chowdhury  and
Ray W. Carpenter
Wolfgang Braue
Affiliation:
German Aerospace Research Establishment (DLR), Materials Research Institute, D-51147 Cologne, Germany
K. Das Chowdhury
Affiliation:
Massachusetts Institute of Technology, Mat. Sci. & Eng. Dept., Cambridge, MA 02139
Ray W. Carpenter
Affiliation:
Arizona State University, Center For Solid State Science, Tempe, AZ 85287-1704
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Abstract

During an HREM/AEM investigation, two different oxygen sinks were identified for a variety of SiC-ceramics involving different sintering mechanisms: segregation of oxygen to i) internal interfaces, and ii) “excess-carbon” secondary phases consisting of basically turbostratic graphite and an intermediate amorphous Si-C-O phase. Si-C-O glasses and polycarbosilanebased nonstoichiometric SiC materials (Nicalon fibers) are well suited as model systems to evaluate the structure and the stability range of the amorphous Si-C-O phase in SiC-based ceramics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 327: Symposium N – Covalent Ceramics II: Non-Oxides , 1993 , 275
Copyright
Copyright © Materials Research Society 1994

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