Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2186
Título: Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA
Autor: Shohoji, Nobumitsu
Oliveira, F. A. Costa
Rosa, Luís Guerra
Fernandes, Jorge Cruz
Magalhães, Teresa
Coelho, Manuel Caldeira
Rodriguez, José
Canadas, Inmaculada
Ramos, Carlos
Martinez, Diego
Palavras-chave: Solar furnace
Carbo-nitrides
Non-stoichiometry
Synthesis
Data: 2013
Editora: Trans. Tech. Publications
Citação: Shohoji, N.; Oliveira, F.A. Costa; Rosa, L. Guerra; Fernandes, J. Cruz; Magalhães, T.; Coelho, M. Caldeira; Rodríguez, J.; Canãdas, I.; Ramos, C.; Martínez, D. Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA. In: Materials Science Forum, 2013, Vol. 730-732, p. 153-158
Resumo: Carbo-nitride synthesis was undertaken using a solar furnace at PSA in flowing N2/Ar gas mixture under total pressure 1 atm and processing temperature T = 1600ºC for some d-group transition elements (Ti; Zr, V, Nb, Mo, W) starting from 1.5G/M (graphite/metal powder mixture with mole ratio 1.5:1) compact to ensure co-presence of free carbon with the reaction product. Clear X-ray diffraction (XRD) evidence of formation of carbo-nitride was detected for Ti (IVa group metal) showing higher N content in the carbo-nitride synthesised in N2 gas environment at partial pressure p(N2) = 1 atm than that at p(N2) = 0.5 atm. For M = V and Nb (Va group metals), formation of mono-carbide MC single-phase was detected in the N2 environment showing no evidence of formation of carbo-nitride in spite of presence of N2 in the environment. For M = Mo and W (VIa group metals), formation of higher carbide, among several options of carbide phases, appeared to be promoted in the N2 gas environment although, like in cases with the Va group metals, no evidence of dissolution of N into the reaction product was detected. As such, at T = 1600ºC in N2 gas environment up to p(N2) = 1 atm under concentrated solar beam, carbo-nitride formed from the 1.5G/M mixture only for IVa group metal (Ti) but not for Va and VIa group metals. Anyway, it seemed certain that N2 gas affected somehow the reaction path between G and M to yield the carbide phase for M = V, Nb, Mo and W.
URI: http://hdl.handle.net/10400.9/2186
ISSN: 1662-9752
Versão do Editor: http://dx.doi.org/10.4028/www.scientific.net/MSF.730-732.153
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