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Formation of tough interlocking microstructure in ZrB2–SiC-based ultrahigh-temperature ceramics by pressureless sintering

Published online by Cambridge University Press:  31 January 2011

Ji Zou ,
Guo-Jun Zhang  and
Yan-Mei Kan
Ji Zou
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China; and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Guo-Jun Zhang*
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China; and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Yan-Mei Kan
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China
*
a) Address all correspondence to this author. e-mail: gjzhang@mail.sic.ac.cn
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Abstract

A self-reinforced ultrahigh-temperature ceramic (UHTC) with elongated ZrB2 grains has been successfully densified by pressureless sintering using commercially available ZrB2, SiC, and WC powders as raw materials. Benefiting from the unique interlocking microstructure, this material had improved strength (518 ± 10 MPa) and higher fracture toughness (6.5 ± 0.2 MPa m1/2) compared to ZrB2–SiC ceramics prepared by pressureless sintering. This work provides a new route for tailoring the microstructure and mechanical properties of UHTCs.

Keywords

CompositeMicrostructureToughness
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2428 - 2434
Copyright
Copyright © Materials Research Society 2009

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