Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 258, Issue -, Pages 383-390Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2017.11.002
Keywords
ZrC whiskers; Microwave hydrothermal; Carbothermal reduction; Growth mechanism
Funding
- National Natural Science Foundation of China [51472202]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU) of China [142-TZ-2016]
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Zirconium carbide (ZrC) whiskers were successfully synthesized by a combination of microwave hydrothermal (MH) and carbothermal reduction. The precursors of ZrC whiskers were produced by MH, subsequently carbothermally reduced to ZrC whiskers at 1100-1600 degrees C in an Ar atmosphere. Effects of the reduction temperature and precursors with various carbon/zirconium (C/Zr) molar ratios on the synthesis of ZrC whiskers were investigated. The results showed that the carbothermal reduction occurred at 1100 degrees C, and terminated at a relatively low temperature (1400 degrees C). When the reduction temperature was 1500 degrees C and the C/Zr molar ratio was 5:1, the ZrC whiskers with the largest aspect ratio and the most uniform distribution were produced. The whiskers exhibited the diameters of 0.1-2 mu m and the lengths of 5-30 mu m. The synthesized ZrC whiskers with a single crystalline phase displayed cylindrical and pagoda-like morphologies. The growth of ZrC whiskers was considered to be governed by the Ostwald ripening and S-L-S mechanism.
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