Sintering of in-Situ Synthesized Sic-TiB2 Composites with Improved Fracture Toughness

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, TiB...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-09, Vol.75 (9), p.2479-2483
Main Authors: Ohya, Yutaka, Hoffmann, Michael J., Petzow, Günter
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
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Summary: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° and 1600°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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1992.tb05600.x