X-ray diffraction study of mechanochemical synthesis and formation mechanisms of zirconium carbide and zirconium silicides

The mechanochemical synthesis and formation mechanisms of zirconium carbide (ZrC) and silicides (ZrSi 2, ZrSi, Zr 5Si 3, and Zr 2Si) by ball-milling were investigated. The spontaneous formation of zirconium carbide during milling occurred by a mechanically induced self-propagating reaction (MSR), th...

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Bibliographic Details
Published in:Journal of alloys and compounds 1998-03, Vol.268 (1), p.266-269
Main Author: Yen, Bing K.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Mechanical alloying
Mechanochemical synthesis
Physics
Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
SHS
Zirconium carbide
Zirconium silicides
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Summary:The mechanochemical synthesis and formation mechanisms of zirconium carbide (ZrC) and silicides (ZrSi 2, ZrSi, Zr 5Si 3, and Zr 2Si) by ball-milling were investigated. The spontaneous formation of zirconium carbide during milling occurred by a mechanically induced self-propagating reaction (MSR), the mechanism of which is analogous to that of the thermally ignited self-propagating high-temperature synthesis (SHS). Under the normal milling condition, the Zr/Si powder mixtures (Si=33–66 at.%) also reacted via the MSR mode to form silicides. The explosive formation of zirconium carbide and silicides could be attributed to their relatively large heats of formation, which made the exothermic reactions self-sustaining once initiated.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(97)00581-1