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Alpha-Si3N4 Precipitation in C/C-SiC Composites from inherent Fiber Impurity Sources

Published online by Cambridge University Press:  15 February 2011

Roland Pleger  and
Wolfgang Braue
Roland Pleger
Affiliation:
German Aerospace Research Establishment (DLR), Materials Research Institute, Linder Hoehe, D-51147 Cologne, Germany
Wolfgang Braue
Affiliation:
German Aerospace Research Establishment (DLR), Materials Research Institute, Linder Hoehe, D-51147 Cologne, Germany
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Abstract

The formation of crystalline α-Si3N4 filaments grown inside the pore channels of HT-carbon fibers from a 2D C/C-SiC composite is investigated by transmission electron microscopy. Precipitation of α-Si3N4 is promoted by a low carbonization heat treatment of the C/C material prior to liquid silicon infiltration and results from the interaction of a highly reactive nitrogen-rich vapor phase released from the fiber and silicon vapor diffusing ahead of the SiC reaction front into the porous microtexture of the fiber.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 89
Copyright
Copyright © Materials Research Society 1995

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