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Vol. 28. Issue 2.
Pages 112-116 (July - December 2016)
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Vol. 28. Issue 2.
Pages 112-116 (July - December 2016)
Special Issue on New Challenges in Energy Materials
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Low-temperature short-time nitriding of Va-group metals, V, Nb and Ta, in uncracked NH3 gas under heating with concentrated solar power (CSP)
J.C. Fernandesa, F.A.C. Oliveirab, L.G. Rosaa, J. Rodríguezc, I. Cañadasc, T. Magalhãesb, N. Shohojib,
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a UL - Universidade de Lisboa, IST - Instituto Superior Técnico, DEM - Departamento de Engenharia Mecânica, and IDMEC - Instituto de Engenharia Mecânica (Pólo IST), Av. Rovisco Pais, 1049-001 Lisboa, Portugal
b LNEG - Laboratório Nacional de Energia e Geologia I.P., Laboratório de Energia, Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal
c CIEMAT - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, PSA - Plataforma Solar de Almería, Apartado 22, E-04200 Tabernas (Almería), Spain
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Over the last two decades, the authors have been using concentrated solar beam as the reaction heat source for synthesizing carbides and nitrides of d-group transition elements in view of usage of ecological renewable energy source in place of conventional heat sources using electricity or natural gas. In recent works, nitriding of VIa-group metals (Cr, Mo, W) and Fe in stream of NH3 gas with suppressed extent of dissociation (uncracked NH3) was attempted under heating with concentrated solar beam. It was demonstrated that mono-nitride δ-MoN of Mo and sub-nitride ¿-Fe2N of Fe that are known to be impossible to synthesize in N2 gas environment even at elevated N2 gas partial pressure p(N2) up to 300bar were successfully synthesized by the reactions of these metals in stream of NH3 gas under heating with concentrated solar beam up to 800°C.

In the present work, nitriding of Va-group metals (V, Nb and Ta) was attempted in stream of NH3 gas under irradiation of concentrated solar beam. After 90min heating in uncracked NH3 under concentrated solar beam up to 800°C, X-ray diffraction (XRD) characterization of the reaction products showed certain extent of nitriding progressed for all the specimens in spite of relatively low reaction temperature for short reaction duration.

Uncracked NH3 gas
CSP (concentrated solar power)
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Copyright © 2016. Portuguese Society of Materials (SPM)
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