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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.2013007013
pages 57-69

THERMITE-BASED COMBUSTION SYNTHESIS OF NIOBIUM SILICIDES/Al2O3 COMPOSITES

Chun-Liang Yeh
Department of Aerospace and Systems Engineering, Feng Chia University, 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan
Yu-Shan Huang
Department of Aerospace and Systems Engineering, Feng Chia University, 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan

RÉSUMÉ

In situ formation of NbSi2- and Nb5Si3-Al2O3 composites with a wide composition range was achieved by self-propagating high-temperature synthesis (SHS) involving thermite reactions. Two thermite mixtures, Al-Nb2O5 and Al-Nb2O5-SiO2, were incorporated into the Nb-Si combustion system. As the extent of aluminothermic reduction involved in the SHS process increases for a higher content of Al2O3, the combustion temperature and reaction front velocity are enhanced due to the increase of combustion exothermicity. Although the SiO2-added reaction is less energetic, the Al-Nb2O5-SiO2 thermite mixture contributes to the final product with a higher content of Al2O3, especially for the NbSi2-Al2O3 composite. Based upon the X-ray diffraction analysis, the NbSi2-Al2O3 composite was produced with a small amount of Nb2Al. On the formation of the Nb5Si3-Al2O3 composites, Nb5Si3 of the α form was yielded as the dominant silicide when stoichiometric samples were adopted, while β-phase Nb5Si3 was favored for the green samples containing 10% excess Si.


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