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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
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
Copyright
Copyright © Materials Research Society 1995

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