Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455879 | Materials Science and Engineering: A | 2017 | 22 Pages |
Abstract
ZrB2 powders with nano-sized SiC synthesized by in-situ reaction were used to improve the sintering behavior and the mechanical properties of hot-pressed ZrB2-based ultra-high temperature ceramic composites. Microstructure analysis indicated that the mean size of ZrB2 and SiC particles was about 300Â nm and 40Â nm, respectively. The nano-sized SiC particles homogeneously distributed on the surfaces of ZrB2 particles. The introduction of nano-sized SiC via in-situ reaction significantly improved the densification process. In the ZrB2-based ceramic composites, the ZrB2 phase formed an inter-locking structure, which was beneficial to the improvement of mechanical properties. The dominant mechanisms for the improved mechanical properties are attributed to the plate-like ZrB2 grain pull-out, crack branching and crack deflection along the grain boundaries.
Keywords
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
J.J. Sha, Z.F. Zhang, S.X. Di, Z.Z. Lv, J. Li, J.X. Dai,