Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing

Detalhes bibliográficos
Autor(a) principal: De Lazzari,Claudio Parra
Data de Publicação: 2007
Outros Autores: Simões,Danielle Goya, Capocchi,José Deodoro Trani
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200020
Resumo: Aluminothermic reduction of niobium pentoxide was studied through thermal analysis techniques such as differential thermal analysis (DTA) and thermogravimetry (TG) as well as through high energy milling processing. Reactants mixtures were composed by powders of Nb2O5 and Al. In the case of DTA-TG experiments, different molar ratios Nb2O5:Al were heated in a dynamic atmosphere of synthetic air under controlled conditions. The high energy milling runs were carried out via SPEX vibratory mill under argon atmosphere and with milling power equal to 7:1 (ratio of mass of balls to mass of mixture) with 10 pct excess of Al over the stoichiometric mass of aluminum necessary. In both kinds of experiments, X ray diffraction was used in order to identify the products of reaction. From DTA-TG experiments, it was possible to determine the experimental value of the enthalpy change (-595.9 kJ.mol-1), which is near to the theoretical one. From the milling experiments, it was possible to verify the possibility of the occurance of aluminothermic reducion of niobium pentoxide via this kind of processing.
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spelling Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processingaluminothermyniobium pentoxidethermal analysishigh energy millingAluminothermic reduction of niobium pentoxide was studied through thermal analysis techniques such as differential thermal analysis (DTA) and thermogravimetry (TG) as well as through high energy milling processing. Reactants mixtures were composed by powders of Nb2O5 and Al. In the case of DTA-TG experiments, different molar ratios Nb2O5:Al were heated in a dynamic atmosphere of synthetic air under controlled conditions. The high energy milling runs were carried out via SPEX vibratory mill under argon atmosphere and with milling power equal to 7:1 (ratio of mass of balls to mass of mixture) with 10 pct excess of Al over the stoichiometric mass of aluminum necessary. In both kinds of experiments, X ray diffraction was used in order to identify the products of reaction. From DTA-TG experiments, it was possible to determine the experimental value of the enthalpy change (-595.9 kJ.mol-1), which is near to the theoretical one. From the milling experiments, it was possible to verify the possibility of the occurance of aluminothermic reducion of niobium pentoxide via this kind of processing.ABM, ABC, ABPol2007-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200020Materials Research v.10 n.2 2007reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392007000200020info:eu-repo/semantics/openAccessDe Lazzari,Claudio ParraSimões,Danielle GoyaCapocchi,José Deodoro Tranieng2007-09-04T00:00:00Zoai:scielo:S1516-14392007000200020Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2007-09-04T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
title Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
spellingShingle Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
De Lazzari,Claudio Parra
aluminothermy
niobium pentoxide
thermal analysis
high energy milling
title_short Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
title_full Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
title_fullStr Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
title_full_unstemmed Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
title_sort Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
author De Lazzari,Claudio Parra
author_facet De Lazzari,Claudio Parra
Simões,Danielle Goya
Capocchi,José Deodoro Trani
author_role author
author2 Simões,Danielle Goya
Capocchi,José Deodoro Trani
author2_role author
author
dc.contributor.author.fl_str_mv De Lazzari,Claudio Parra
Simões,Danielle Goya
Capocchi,José Deodoro Trani
dc.subject.por.fl_str_mv aluminothermy
niobium pentoxide
thermal analysis
high energy milling
topic aluminothermy
niobium pentoxide
thermal analysis
high energy milling
description Aluminothermic reduction of niobium pentoxide was studied through thermal analysis techniques such as differential thermal analysis (DTA) and thermogravimetry (TG) as well as through high energy milling processing. Reactants mixtures were composed by powders of Nb2O5 and Al. In the case of DTA-TG experiments, different molar ratios Nb2O5:Al were heated in a dynamic atmosphere of synthetic air under controlled conditions. The high energy milling runs were carried out via SPEX vibratory mill under argon atmosphere and with milling power equal to 7:1 (ratio of mass of balls to mass of mixture) with 10 pct excess of Al over the stoichiometric mass of aluminum necessary. In both kinds of experiments, X ray diffraction was used in order to identify the products of reaction. From DTA-TG experiments, it was possible to determine the experimental value of the enthalpy change (-595.9 kJ.mol-1), which is near to the theoretical one. From the milling experiments, it was possible to verify the possibility of the occurance of aluminothermic reducion of niobium pentoxide via this kind of processing.
publishDate 2007
dc.date.none.fl_str_mv 2007-06-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200020
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200020
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392007000200020
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.10 n.2 2007
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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