Combustion synthesis of mechanically-activated Nb-Al mixtures

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dc.contributor.authorBURACOVAS, F.pt_BR
dc.contributor.authorGONCALVES, V.S.pt_BR
dc.contributor.authorROCHA, C.J.pt_BR
dc.contributor.authorLEAL NETO, R.M.pt_BR
dc.coverageInternacionalpt_BR
dc.creator.eventoINTERNATIONAL LATIN-AMERICAN CONFERENCE ON POWDER TECHNOLOGY, 4thpt_BR
dc.date.accessioned2014-11-17T17:58:07Zpt_BR
dc.date.accessioned2014-11-18T17:56:25Zpt_BR
dc.date.accessioned2015-04-02T03:38:07Z
dc.date.available2014-11-17T17:58:07Zpt_BR
dc.date.available2014-11-18T17:56:25Zpt_BR
dc.date.available2015-04-02T03:38:07Z
dc.date.eventoNov. 19-21, 2003pt_BR
dc.description.abstractIn this work shake milling were used to mechanically activate Nb — Al powder mixtures at different relative proportions (Nb80A1, Nb65A1, Nb54A1 e Nb42A1). All milling process parameters were unchanged, e.g., powders mass, ball/powder mass ratio, balls diameter, quantity and kind of process control agent. Uniaxially compacted cylindrical pellets of milled powders were vacuum reacted. After a two-step degassing treatment (290°C for 0.5 h and 400°C for 4 h), samples were heated at 30°C/min. Ignition and combustion temperatures were measured by a thermocouple inserted in a hole drilled into the pellets. The microstructure of milled powders and reacted pellets were characterized by X -ray diffraction and SEM analysis. Bulk density of the pellets was measured by water iimnersion (Archimedes). The results showed a decrease of both ignition and combustion temperature with mechanical activation as seen by comparison with reacted pellets of the same composition not mechanically activated (simple mixtures). By increasing the heating hate the completeness of the reactions were improved. The lower the aluminum contents the lower the ignition and combustion temperatures and also the densification. The decrease on ignition temperature was caused by a more effective dispersion (and so more activation) attained by samples with lower aluminum content.
dc.event.siglaPTECH 2003pt_BR
dc.identifier.citationBURACOVAS, F.; GONCALVES, V.S.; ROCHA, C.J.; LEAL NETO, R.M. Combustion synthesis of mechanically-activated Nb-Al mixtures. In: INTERNATIONAL LATIN-AMERICAN CONFERENCE ON POWDER TECHNOLOGY, 4th, Nov. 19-21, 2003, Guaruja, SP. <b>Proceedings...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/15550.
dc.identifier.orcidhttps://orcid.org/0000-0001-5104-7392
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/15550pt_BR
dc.local.eventoGuaruja, SPpt_BR
dc.rightsopenAccess
dc.sourcePublicado em: Materials Science Forum, , v. 498/499, p. 152-157, 2005pt_BR
dc.subjectniobiumpt_BR
dc.subjectaluminiumpt_BR
dc.subjectmillingpt_BR
dc.subjectcombustionpt_BR
dc.subjectsynthesispt_BR
dc.subjectx-ray diffractionpt_BR
dc.titleCombustion synthesis of mechanically-activated Nb-Al mixturespt_BR
dc.typeTexto completo de eventopt_BR
dspace.entity.typePublication
ipen.autorRICARDO MENDES LEAL NETO
ipen.autorCLAUDIO JOSE DA ROCHA
ipen.autorVALERIA DE SA GONCALVES
ipen.autorFABIANA BURACOVAS
ipen.codigoautor520
ipen.codigoautor764
ipen.codigoautor2941
ipen.codigoautor3007
ipen.contributor.ipenauthorRICARDO MENDES LEAL NETO
ipen.contributor.ipenauthorCLAUDIO JOSE DA ROCHA
ipen.contributor.ipenauthorVALERIA DE SA GONCALVES
ipen.contributor.ipenauthorFABIANA BURACOVAS
ipen.date.recebimento05-01pt_BR
ipen.event.datapadronizada2003pt_BR
ipen.identifier.ipendoc10100pt_BR
ipen.notas.internasProceedingspt_BR
ipen.type.genreArtigo
relation.isAuthorOfPublicationb5e83d03-1f9c-4e57-8e02-628a903c95f8
relation.isAuthorOfPublication89854a08-c999-4073-aa92-96f7a0ddbc01
relation.isAuthorOfPublication74f89c0f-cebc-45b6-8f2a-abfea6fe1182
relation.isAuthorOfPublication679cc66f-9590-4147-a8ec-6032385f1fd5
relation.isAuthorOfPublication.latestForDiscovery679cc66f-9590-4147-a8ec-6032385f1fd5
sigepi.autor.atividadeBURACOVAS, F.:3007:-1:Spt_BR
sigepi.autor.atividadeGONCALVES, V.S.:2941:-1:Npt_BR
sigepi.autor.atividadeROCHA, C.J.:764:32:Npt_BR
sigepi.autor.atividadeLEAL NETO, R.M.:520:32:Npt_BR
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