PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR

Detalhes bibliográficos
Autor(a) principal: SOUZA,C. P.
Data de Publicação: 1999
Outros Autores: FAVOTTO,C., SATRE,P., L' HONORÉ,A., ROUBIN,M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Brazilian Journal of Chemical Engineering
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66321999000100001
Resumo: In this work we have synthesized an organometallic oxalic precursor from tantalum oxide. This oxide was solubilized by heating with potassium hydrogen sulfate. In order to precipitate Ta2O5.nH2O, the fused mass obtained was dissolved in a sulfuric acid solution and neutralized with ammonia. The hydrated tantalum oxide precipitated was dissolved in an equimolar solution of oxalic acid/ammonium oxalate. The synthesis and the characterization of the tantalum oxalic precursor are described. Pyrolysis of the complex in a mixture of hydrogen and methane at atmospheric pressure was studied. The gas-solid reaction made it possible to obtain tantalum carbide, TaC, in the powder form at 1000oC. The natural sintering of TaC powder in an inert atmosphere at 1400°C during 10 hours, under inert atmosphere made it possible to densify the carbide to 96% of the theoretical value.
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spelling PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSORorganometallictantalum carbideprecursorIn this work we have synthesized an organometallic oxalic precursor from tantalum oxide. This oxide was solubilized by heating with potassium hydrogen sulfate. In order to precipitate Ta2O5.nH2O, the fused mass obtained was dissolved in a sulfuric acid solution and neutralized with ammonia. The hydrated tantalum oxide precipitated was dissolved in an equimolar solution of oxalic acid/ammonium oxalate. The synthesis and the characterization of the tantalum oxalic precursor are described. Pyrolysis of the complex in a mixture of hydrogen and methane at atmospheric pressure was studied. The gas-solid reaction made it possible to obtain tantalum carbide, TaC, in the powder form at 1000oC. The natural sintering of TaC powder in an inert atmosphere at 1400°C during 10 hours, under inert atmosphere made it possible to densify the carbide to 96% of the theoretical value.Brazilian Society of Chemical Engineering1999-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66321999000100001Brazilian Journal of Chemical Engineering v.16 n.1 1999reponame:Brazilian Journal of Chemical Engineeringinstname:Associação Brasileira de Engenharia Química (ABEQ)instacron:ABEQ10.1590/S0104-66321999000100001info:eu-repo/semantics/openAccessSOUZA,C. P.FAVOTTO,C.SATRE,P.L' HONORÉ,A.ROUBIN,M.eng1999-07-27T00:00:00Zoai:scielo:S0104-66321999000100001Revistahttps://www.scielo.br/j/bjce/https://old.scielo.br/oai/scielo-oai.phprgiudici@usp.br||rgiudici@usp.br1678-43830104-6632opendoar:1999-07-27T00:00Brazilian Journal of Chemical Engineering - Associação Brasileira de Engenharia Química (ABEQ)false
dc.title.none.fl_str_mv PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
title PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
spellingShingle PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
SOUZA,C. P.
organometallic
tantalum carbide
precursor
title_short PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
title_full PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
title_fullStr PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
title_full_unstemmed PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
title_sort PREPARATION OF TANTALUM CARBIDE FROM AN ORGANOMETALLIC PRECURSOR
author SOUZA,C. P.
author_facet SOUZA,C. P.
FAVOTTO,C.
SATRE,P.
L' HONORÉ,A.
ROUBIN,M.
author_role author
author2 FAVOTTO,C.
SATRE,P.
L' HONORÉ,A.
ROUBIN,M.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv SOUZA,C. P.
FAVOTTO,C.
SATRE,P.
L' HONORÉ,A.
ROUBIN,M.
dc.subject.por.fl_str_mv organometallic
tantalum carbide
precursor
topic organometallic
tantalum carbide
precursor
description In this work we have synthesized an organometallic oxalic precursor from tantalum oxide. This oxide was solubilized by heating with potassium hydrogen sulfate. In order to precipitate Ta2O5.nH2O, the fused mass obtained was dissolved in a sulfuric acid solution and neutralized with ammonia. The hydrated tantalum oxide precipitated was dissolved in an equimolar solution of oxalic acid/ammonium oxalate. The synthesis and the characterization of the tantalum oxalic precursor are described. Pyrolysis of the complex in a mixture of hydrogen and methane at atmospheric pressure was studied. The gas-solid reaction made it possible to obtain tantalum carbide, TaC, in the powder form at 1000oC. The natural sintering of TaC powder in an inert atmosphere at 1400°C during 10 hours, under inert atmosphere made it possible to densify the carbide to 96% of the theoretical value.
publishDate 1999
dc.date.none.fl_str_mv 1999-03-01
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=S0104-66321999000100001
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66321999000100001
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0104-66321999000100001
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 Brazilian Society of Chemical Engineering
publisher.none.fl_str_mv Brazilian Society of Chemical Engineering
dc.source.none.fl_str_mv Brazilian Journal of Chemical Engineering v.16 n.1 1999
reponame:Brazilian Journal of Chemical Engineering
instname:Associação Brasileira de Engenharia Química (ABEQ)
instacron:ABEQ
instname_str Associação Brasileira de Engenharia Química (ABEQ)
instacron_str ABEQ
institution ABEQ
reponame_str Brazilian Journal of Chemical Engineering
collection Brazilian Journal of Chemical Engineering
repository.name.fl_str_mv Brazilian Journal of Chemical Engineering - Associação Brasileira de Engenharia Química (ABEQ)
repository.mail.fl_str_mv rgiudici@usp.br||rgiudici@usp.br
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