期刊
SCRIPTA MATERIALIA
卷 66, 期 5, 页码 296-299出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2011.11.013
关键词
Zirconium diboride; Zr-Al-C ceramics; Layered structures; Microstructure; Mechanical properties
A ZrB2-20 vol.% SiC-30 vol.% Zr-Al-C ceramic was fabricated by hot pressing at 1900 degrees C and 30 MPa for 1 h in vacuum. The ZrB2-SiC/Zr-Al-C ceramic showed an excellent fracture toughness of 5.4 +/- 0.4 MPa m(1/2) due to its ZrB2/Zr-Al-C fibrous monolith microstructure and the in situ formed layered Zr-Al-C grains, which could enhance crack deflection, crack bridging and crack branching. In addition, the weaker interface bonding and weaker internal layers existed within the Zr-Al-C crystal. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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