Microstructure and oxidation resistance of porous NbAl3 intermetallic prepared by thermal explosion reaction |
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| Authors: | Xiaoping Cai Rui Xu Xuanru Ren Xueqin Kang |
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| Affiliation: | 1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, People’s Republic of China;2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, People’s Republic of China |
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| Abstract: | ![]()
Porous Nb–Al intermetallic was prepared by thermal explosion (TE) of combustion synthesis (CS). The temperature profile, phase composition, open porosity and oxidation resistance of Nb–Al compact were investigated. The results showed that the significant exothermic reaction occurred, which means that an obvious TE appeared during heating. The volume expansion of 190% was observed, and the prepared sample exhibited interconnected pores with an open porosity of 65.7%. The porous NbAl3 intermetallic showed ‘pest’ oxidation in the temperature range of 500–600°C, and followed the parabolic oxidation law at 400°C. Moreover, due to the highly porous structure, this material had great potential for application to separation and heat insulation at a temperature range of room temperature to 400°C. |
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| Keywords: | Intermetallics niobium–aluminium combustion synthesis thermal explosion porous material microstructure oxidation parabolic kinetics |
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