DENSIFICATION MECHANISMS DURING HOT PRESSING OF ZrB2-20 VOL% SiC COMPOSITE

The dominant densification mechanisms for hot pressing of ZrB2-20 vol% SiC composite at different hot-pressing temperatures and pressures were identified. They were found to change over a very short temperature range. For hot pressing at 1700 C, the dominant densification mechanism was mechanically...

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Bibliographic Details
Published in:Scripta materialia 2013-09, Vol.69 (5), p.370-373
Main Authors: Patel, M, Singh, V, Reddy, J J, Bhanu, Prasad V V, Jayaram, V
Format: Article
Language:English
Subjects:
Densification
Fragmentation
Grain boundary diffusion
Hot pressing
Particulate composites
Plastic flow
Silicon carbide
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Summary:The dominant densification mechanisms for hot pressing of ZrB2-20 vol% SiC composite at different hot-pressing temperatures and pressures were identified. They were found to change over a very short temperature range. For hot pressing at 1700 C, the dominant densification mechanism was mechanically driven particle fragmentation and rearrangement only, whereas at 1850 C a plastic flow mechanism started to become dominant after initial particle fragmentation and rearrangement. At 2000 C, the dominant mechanism changed from plastic flow to grain boundary diffusion.
ISSN:1359-6462
DOI:10.1016/j.scriptamat.2013.05.021