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

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

Abstract: 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 Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 1992
Sprache Englisch
Identifikator ISSN: 0002-7820
KITopen ID: 1000007798
Erschienen in Journal of the American Ceramic Society
Band 75
Heft 9
Seiten 2479-2483
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