In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process

Autores
Gilliard, María Belén; Pierini, Beatriz Teresita; Alconchel, Silvia Alejandra
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The in situ formation of Fe–NbC/C composite powders was studied using solution-derived precursors and a gas reduction–carburization reaction at 1223 K. The effect of different CH4/H2/Ar gas mixtures or a polymer (polyvinyl alcohol – PVA) combined with sucrose as carbon sources was analyzed. The results obtained were discussed in relation to the reduction–carburization sequence, microstructure and oxidation behavior of the composite powders. When the carbon was supplied by the gas phase (CH4), the reaction mechanism proceeded via FeNb2O6→Fe+NbO2→Fe+NbC. However, if the carbon was generated in the solid phase, from PVA–sucrose pyrolysis, the transformation to the compound powder was achieved faster by means of a carbothermal reduction reaction. The type of free carbon was characterized by a high degree of disorder and defined not only the powder microstructure but also the crystallite size of the reinforcement phase (NbC) and certain behavior features during oxidation. The carbon generated by PVA–sucrose pyrolysis (70 wt%) was the most adequate one to obtain a sponge-type morphology with nanocrystalline NbC (12 nm) and to protect the Fe particles from oxidation. Even so, all the composite powders prepared remained stable in air up to about 600 K.
Fil: Gilliard, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; Argentina
Fil: Pierini, Beatriz Teresita. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; Argentina
Fil: Alconchel, Silvia Alejandra. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; Argentina
Materia
Powders: Chemical Preparation
Electron Microscopy
Oxidation
Carbides
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/30902
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/30902
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization processGilliard, María BelénPierini, Beatriz TeresitaAlconchel, Silvia AlejandraPowders: Chemical PreparationElectron MicroscopyOxidationCarbideshttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The in situ formation of Fe–NbC/C composite powders was studied using solution-derived precursors and a gas reduction–carburization reaction at 1223 K. The effect of different CH4/H2/Ar gas mixtures or a polymer (polyvinyl alcohol – PVA) combined with sucrose as carbon sources was analyzed. The results obtained were discussed in relation to the reduction–carburization sequence, microstructure and oxidation behavior of the composite powders. When the carbon was supplied by the gas phase (CH4), the reaction mechanism proceeded via FeNb2O6→Fe+NbO2→Fe+NbC. However, if the carbon was generated in the solid phase, from PVA–sucrose pyrolysis, the transformation to the compound powder was achieved faster by means of a carbothermal reduction reaction. The type of free carbon was characterized by a high degree of disorder and defined not only the powder microstructure but also the crystallite size of the reinforcement phase (NbC) and certain behavior features during oxidation. The carbon generated by PVA–sucrose pyrolysis (70 wt%) was the most adequate one to obtain a sponge-type morphology with nanocrystalline NbC (12 nm) and to protect the Fe particles from oxidation. Even so, all the composite powders prepared remained stable in air up to about 600 K.Fil: Gilliard, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; ArgentinaFil: Pierini, Beatriz Teresita. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; ArgentinaFil: Alconchel, Silvia Alejandra. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; ArgentinaElsevier2014-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/30902Alconchel, Silvia Alejandra; Pierini, Beatriz Teresita; Gilliard, María Belén; In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process; Elsevier; Ceramics International; 40; 9, Parte B; 6-2014; 14881-148890272-8842CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S027288421400978Xinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.ceramint. 2014.06.083info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:36:47Zoai:ri.conicet.gov.ar:11336/30902instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:36:47.967CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
title In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
spellingShingle In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
Gilliard, María Belén
Powders: Chemical Preparation
Electron Microscopy
Oxidation
Carbides
title_short In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
title_full In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
title_fullStr In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
title_full_unstemmed In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
title_sort In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process
dc.creator.none.fl_str_mv Gilliard, María Belén
Pierini, Beatriz Teresita
Alconchel, Silvia Alejandra
author Gilliard, María Belén
author_facet Gilliard, María Belén
Pierini, Beatriz Teresita
Alconchel, Silvia Alejandra
author_role author
author2 Pierini, Beatriz Teresita
Alconchel, Silvia Alejandra
author2_role author
author
dc.subject.none.fl_str_mv Powders: Chemical Preparation
Electron Microscopy
Oxidation
Carbides
topic Powders: Chemical Preparation
Electron Microscopy
Oxidation
Carbides
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The in situ formation of Fe–NbC/C composite powders was studied using solution-derived precursors and a gas reduction–carburization reaction at 1223 K. The effect of different CH4/H2/Ar gas mixtures or a polymer (polyvinyl alcohol – PVA) combined with sucrose as carbon sources was analyzed. The results obtained were discussed in relation to the reduction–carburization sequence, microstructure and oxidation behavior of the composite powders. When the carbon was supplied by the gas phase (CH4), the reaction mechanism proceeded via FeNb2O6→Fe+NbO2→Fe+NbC. However, if the carbon was generated in the solid phase, from PVA–sucrose pyrolysis, the transformation to the compound powder was achieved faster by means of a carbothermal reduction reaction. The type of free carbon was characterized by a high degree of disorder and defined not only the powder microstructure but also the crystallite size of the reinforcement phase (NbC) and certain behavior features during oxidation. The carbon generated by PVA–sucrose pyrolysis (70 wt%) was the most adequate one to obtain a sponge-type morphology with nanocrystalline NbC (12 nm) and to protect the Fe particles from oxidation. Even so, all the composite powders prepared remained stable in air up to about 600 K.
Fil: Gilliard, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; Argentina
Fil: Pierini, Beatriz Teresita. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; Argentina
Fil: Alconchel, Silvia Alejandra. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Departamento de Química; Argentina
description The in situ formation of Fe–NbC/C composite powders was studied using solution-derived precursors and a gas reduction–carburization reaction at 1223 K. The effect of different CH4/H2/Ar gas mixtures or a polymer (polyvinyl alcohol – PVA) combined with sucrose as carbon sources was analyzed. The results obtained were discussed in relation to the reduction–carburization sequence, microstructure and oxidation behavior of the composite powders. When the carbon was supplied by the gas phase (CH4), the reaction mechanism proceeded via FeNb2O6→Fe+NbO2→Fe+NbC. However, if the carbon was generated in the solid phase, from PVA–sucrose pyrolysis, the transformation to the compound powder was achieved faster by means of a carbothermal reduction reaction. The type of free carbon was characterized by a high degree of disorder and defined not only the powder microstructure but also the crystallite size of the reinforcement phase (NbC) and certain behavior features during oxidation. The carbon generated by PVA–sucrose pyrolysis (70 wt%) was the most adequate one to obtain a sponge-type morphology with nanocrystalline NbC (12 nm) and to protect the Fe particles from oxidation. Even so, all the composite powders prepared remained stable in air up to about 600 K.
publishDate 2014
dc.date.none.fl_str_mv 2014-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/30902
Alconchel, Silvia Alejandra; Pierini, Beatriz Teresita; Gilliard, María Belén; In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process; Elsevier; Ceramics International; 40; 9, Parte B; 6-2014; 14881-14889
0272-8842
CONICET Digital
CONICET
url http://hdl.handle.net/11336/30902
identifier_str_mv Alconchel, Silvia Alejandra; Pierini, Beatriz Teresita; Gilliard, María Belén; In situ formation of Fe–NbC/C composite powders from solution-derived precursors by a gas reduction–carburization process; Elsevier; Ceramics International; 40; 9, Parte B; 6-2014; 14881-14889
0272-8842
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S027288421400978X
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ceramint. 2014.06.083
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1846082836086390784
score 13.22299

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