Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 68, Issue 14, Pages 3033-3040Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2008.06.021
Keywords
Zirconium diboride; Nano Sic particles; Thermal exposure; Flexural strength
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The effect of oxidation exposure on the room-temperature flexural strength of ZrB2-based composites with nano-sized and micron-sized SiC particles was investigated. The composites were densified by vacuum hot-pressing at 2000 degrees C for 60 min under a uniaxial pressure of 30 MPa. The flexural strength of as-received composites and after exposure in air at 1400 degrees C for 10 h was measured using the four-point bending test. The results show that the presence of intergranular and intragranular nano-sized SiC particles imparts a better oxidation resistance and improves the flexural strength of single-phase ZrB2 and ZrB2 ceramics with micron-sized SiC. (C) 2008 Elsevier Ltd. All rights reserved.
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