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Aspects of sintering additives for processing and microstructure development of HIP-SSiC

Oberacker, Rainer; Thuemmler, Fritz; Fetahagic, T.

Abstract:
Additives out of the systems Al-C, Al-B-C and B-C have been
investigated with respect to densification and microstructure
development of SiC produced by pressureless sintering and subsequent
post-hot isostatically pressing (HIP) treatment. Within the
investigated compositional range, the Al-B-C and B-C systems provide
sufficient densification to reach pore closure during pressureless
sintering and nearly theoretical density during the HIP step of the
process. Densification in the IU-B-C system takes place at
significantly reduced temperatures, namely similar to 1900 degreesC vs.
similar to 2050 degreesC in the Al- free product. Dilatometer
experiments and microstructure development indicate the presence of a
liquid phase in this system during sintering. Liquid phase sintering in
the SiC/(Al-B-C) system vs. solid state sintering in the SiC/(B-C)
system will be discussed on the basis of literature data and previous
experimental studies of the authors.


Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2001
Sprache Englisch
Identifikator ISSN: 0044-3093
KITopen ID: 28242001
Erschienen in Zeitschrift für Metallkunde
Band 92
Seiten 135-140
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