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Microstructure of liquid phase sintered superplastic silicon carbide ceramics

Published online by Cambridge University Press:  31 January 2011

Chong-Min Wang ,
Mamoru Mitomo  and
Hideyuki Emoto
Chong-Min Wang
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba-shi, Ibaraki, 305, Japan
Mamoru Mitomo
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba-shi, Ibaraki, 305, Japan
Hideyuki Emoto
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba-shi, Ibaraki, 305, Japan
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Abstract

Superplastic silicon carbide ceramics were fabricated at low temperatures by a liquid phase sintering very fine β–SiC powder. The microstructural features of this material, of both before and after the superplastic deformation, have been investigated by transmission electron microscopy. Evaluated from the point of view of phase transformation, dislocation motion, and dynamic grain growth, the materials show very stable microstructures, indicating that the superplastic deformation process was dominated by the liquid phase assisted grain boundary sliding. In addition, the material is also characterized by the formation of clusters of fine SiC particles (5–20 nm) encapsulated in layered graphitized carbon.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 12 , December 1997 , pp. 3266 - 3270
Copyright
Copyright © Materials Research Society 1997

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