Article In: orcid, scopus, cienciavitae

Low-temperature short-time nitriding of Va-group metals, V, Nb and Ta, in uncracked NH3 gas under heating with concentrated solar power (CSP)

Ciência & Tecnologia dos Materiais

Fernandes, J.C.; Oliveira, F.A.C.; Shohoji, N. — 2016

Key information

Authors:

Fernandes, J.C. (José Jorge Lopes da Cruz Fernandes); Oliveira, F.A.C.; Rosa, L.G. (Luís Manuel Guerra da Silva Rosa); Rodríguez, J.; Cañadas, I. (Fernando de Almeida Costa Oliveira); Magalhães, T.; Shohoji, N.

Published in

July 1, 2016

Abstract

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 ɛ-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 300 bar 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 90 min 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.

Publication details

Authors in the community:

Publication version

AO - Author's Original

Title of the publication container

Ciência & Tecnologia dos Materiais

First page or article number

112

Last page

116

Volume

28

Issue

2

DOI

10.1016/j.ctmat.2017.02.001

Fields of Science and Technology (FOS)

materials-engineering - Materials engineering

Publication language (ISO code)

eng - English

Alternative identifier (URI)

http://www.scopus.com/inward/record.url?eid=2-s2.0-85018528220&partnerID=MN8TOARS

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