Use of dopants for thoria sintering temperature reduction-characterization of THO2

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dc.contributor.authorTAKIISHI, HIDETOSHI
dc.contributor.authorGENOVA, LUIS A.
dc.contributor.authorCAVALHEIRA, ELTON D.
dc.contributor.authorCOTRIM, MARYCEL B.
dc.contributor.authorSANTOS, WILSON
dc.contributor.authorLAINETTI, PAULO E.O.
dc.coverageInternacionalpt_BR
dc.date.accessioned2017-03-14T13:53:03Z
dc.date.available2017-03-14T13:53:03Z
dc.date.issued2016pt_BR
dc.description.abstractThorium is nearly three times more abundant than uranium in the Earth’s crust. Some papers evaluate the thorium resources in Brazil over 1,200,000 metric t. These figures mean that the country is probably the biggest thorium resource in the world, with only part of the territory prospected. Nevertheless, Brazil has not a research program for use of thorium in nuclear reactors, even having dedicated special attention to the subject in the beginning of its nuclear activities, in the fifties and sixties. From 1985 until 2003 IPEN operated a pilot plant for thorium nitrate production and purification, used by Brazilian industry for production of gas mantles. This facility produced over 170 metric t of thorium nitrate. Despite the non-nuclear application, the pilot plant was unique in the southern hemisphere. On the other hand, Brazil has the biggest world niobium resources. The Brazilian thorium and niobium resources added to the predictable future importance of alternative fissile materials have motivated this research, since uranium is a finite resource if used in the present thermal nuclear reactors. Besides this, thorium oxide is an important nuclear reactor material. It is a refractory oxide and its ceramic fabrication process involves a very high temperature sintering treatment considering that thoria melting point is very high (3,650 K). Cations of elements of the group VB (V, Nb and Ta) have a known effect in the reduction of thoria sintering temperature. IPEN has initiated an investigation about the use of niobium as a dopant for thoria sintering temperature reduction. The thoria used in the research was produced in the IPEN’s pilot plant and different amounts of niobium oxide (Nb2O5) will be added to thoria by different routes. The powders will be compressed and the compacted pellets will be sintered at different temperatures. The influence of the different parameters in the density of sintered pellets is being investigated. This paper presents the chemical and physical characterization for the thoria used in the investigation.pt_BR
dc.format.extent740-745pt_BR
dc.identifier.citationTAKIISHI, HIDETOSHI; GENOVA, LUIS A.; CAVALHEIRA, ELTON D.; COTRIM, MARYCEL B.; SANTOS, WILSON; LAINETTI, PAULO E.O. Use of dopants for thoria sintering temperature reduction-characterization of THO2. <b>Journal of Energy and Power Engineering</b>, v. 10, n. 12, p. 740-745, 2016. DOI: <a href="https://dx.doi.org/10.17265/1934-8975/2016.12.004">10.17265/1934-8975/2016.12.004</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/27158.
dc.identifier.doi10.17265/1934-8975/2016.12.004pt_BR
dc.identifier.fasciculo12pt_BR
dc.identifier.issn1934-8975pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-6462-4758
dc.identifier.orcidhttps://orcid.org/0000-0002-5172-5082
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/27158
dc.identifier.vol10pt_BR
dc.relation.ispartofJournal of Energy and Power Engineeringpt_BR
dc.rightsopenAccesspt_BR
dc.subjectchemical analysis
dc.subjectdensity
dc.subjecthistorical aspects
dc.subjectniobium oxides
dc.subjectnuclear fuels
dc.subjectpellets
dc.subjectreduction
dc.subjectsintering
dc.subjecttemperature range 0400-1000 k
dc.subjectthorium
dc.subjectbrazilian cnen
dc.titleUse of dopants for thoria sintering temperature reduction-characterization of THO2pt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorELTON DANILO CAVALHEIRA
ipen.autorPAULO ERNESTO DE OLIVEIRA LAINETTI
ipen.autorWILSON ROBERTO DOS SANTOS
ipen.autorMARYCEL ELENA BARBOZA COTRIM
ipen.autorLUIS ANTONIO GENOVA
ipen.autorHIDETOSHI TAKIISHI
ipen.codigoautor12136
ipen.codigoautor149
ipen.codigoautor921
ipen.codigoautor515
ipen.codigoautor320
ipen.codigoautor25
ipen.contributor.ipenauthorELTON DANILO CAVALHEIRA
ipen.contributor.ipenauthorPAULO ERNESTO DE OLIVEIRA LAINETTI
ipen.contributor.ipenauthorWILSON ROBERTO DOS SANTOS
ipen.contributor.ipenauthorMARYCEL ELENA BARBOZA COTRIM
ipen.contributor.ipenauthorLUIS ANTONIO GENOVA
ipen.contributor.ipenauthorHIDETOSHI TAKIISHI
ipen.date.recebimento17-03pt_BR
ipen.identifier.fiSem F.I.pt_BR
ipen.identifier.ipendoc23511pt_BR
ipen.type.genreArtigo
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sigepi.autor.atividadeTAKIISHI, HIDETOSHI:25:730:Spt_BR
sigepi.autor.atividadeGENOVA, LUIS A.:320:720:Npt_BR
sigepi.autor.atividadeCAVALHEIRA, ELTON D.:12136:730:Npt_BR
sigepi.autor.atividadeCOTRIM, MARYCEL B.:515:510:Npt_BR
sigepi.autor.atividadeSANTOS, WILSON:921:-1:Npt_BR
sigepi.autor.atividadeLAINETTI, PAULO E.O.:149:520:Npt_BR
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