Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.9/2186 |
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. |
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Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSASolar furnaceCarbo-nitridesNon-stoichiometrySynthesisCarbo-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.Trans. Tech. PublicationsRepositório do LNEGShohoji, NobumitsuOliveira, Fernando Almeida CostaRosa, Luís GuerraFernandes, Jorge CruzMagalhães, TeresaCoelho, Manuel CaldeiraRodriguez, JoséCañadas, InmaculadaRamos, CarlosMartinez, Diego2014-02-12T14:26:40Z20132013-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/2186engShohoji, 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. 153-1581662-9752info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-12T06:11:18Zoai:repositorio.lneg.pt:10400.9/2186Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:35:04.291509Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA |
title |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA |
spellingShingle |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA Shohoji, Nobumitsu Solar furnace Carbo-nitrides Non-stoichiometry Synthesis |
title_short |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA |
title_full |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA |
title_fullStr |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA |
title_full_unstemmed |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA |
title_sort |
Synthesising carbo-nitrides of some d-group transition metals using a solar furnace at PSA |
author |
Shohoji, Nobumitsu |
author_facet |
Shohoji, Nobumitsu Oliveira, Fernando Almeida Costa Rosa, Luís Guerra Fernandes, Jorge Cruz Magalhães, Teresa Coelho, Manuel Caldeira Rodriguez, José Cañadas, Inmaculada Ramos, Carlos Martinez, Diego |
author_role |
author |
author2 |
Oliveira, Fernando Almeida Costa Rosa, Luís Guerra Fernandes, Jorge Cruz Magalhães, Teresa Coelho, Manuel Caldeira Rodriguez, José Cañadas, Inmaculada Ramos, Carlos Martinez, Diego |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório do LNEG |
dc.contributor.author.fl_str_mv |
Shohoji, Nobumitsu Oliveira, Fernando Almeida Costa Rosa, Luís Guerra Fernandes, Jorge Cruz Magalhães, Teresa Coelho, Manuel Caldeira Rodriguez, José Cañadas, Inmaculada Ramos, Carlos Martinez, Diego |
dc.subject.por.fl_str_mv |
Solar furnace Carbo-nitrides Non-stoichiometry Synthesis |
topic |
Solar furnace Carbo-nitrides Non-stoichiometry Synthesis |
description |
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. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013 2013-01-01T00:00:00Z 2014-02-12T14:26:40Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.9/2186 |
url |
http://hdl.handle.net/10400.9/2186 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
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 1662-9752 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Trans. Tech. Publications |
publisher.none.fl_str_mv |
Trans. Tech. Publications |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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