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Sintering of Insitu Synthesized SiC-TiB2 Composites with Improved Fracture-Toughness

Ohya, Y.; Hoffmann, M. J.; Petzow, G.


TiB2-particle reinforcement is one of the most successful methods for
improving the fracture toughness of SiC ceramics.1-3 Commercially
available TiB2 powders, however, have a large particle size and/or are
highly reactive so that they are not favorable as a starting powder. In
the present work, TiB2 particles are formed by an in situ reaction
between TiC and boron. The reaction takes place during sintering
between 1000-degrees and 1600-degrees-C and is accompanied by a large
volume expansion. Under optimum conditions, dense composites (>98% of
theoretical) can be obtained by pressureless sintering using B and C as
sintering additives. The in situ reaction method enables, for the first
time, a complete densification of SiC-particulate composites by
pressureless sintering. The fracture toughness of the composites was
approximately 30% higher than that of the monolithic SiC ceramic.

Zugehörige Institution(en) am KIT Fakultät für Maschinenbau – Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 1992
Sprache Englisch
Identifikator ISSN: 0002-7820
KITopen-ID: 1000007798
Erschienen in Journal of the American Ceramic Society
Verlag American Ceramic Society
Band 75
Heft 9
Seiten 2479-2483
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