Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/10874 |
Resumo: | In this thesis, we investigated the production of Yttrium-doped Barium Zirconate proton-conducting electrolytes with 20 at.% of Yttrium (BaZr0.8Y0.2O3-δ) via solid state reaction. The great challenge presented by this material is its refractory nature, which limits densification as well as grain growth at temperatures below 1700⁰C. The influence of sintering additives on the microstructural development and on the formation of desired phase were also investigated. The literature is lacking on this subject, since there is no consensus concerning the mechanisms of action of sintering additives, and most times, ceramic processing fundaments are not taken in to consideration. In this thesis Aluminum oxide, Zinc oxide and Yttrium-Barium cuprate were selected as additives, being that the latter has not yet been reported in the literature. Compositions without additives were also prepared for comparison purposes. Samples with densification greater than 97% after sintering at 1600⁰C were obtained even without sintering additives and with a mean grain size of 1.40 μm. The results obtained in this thesis show that the real purpose of using certain sintering additives is to affect the formation of yttrium-rich secondary crystalline phase, which remains in grain boundary, hinders grain growth, and damages electrical conductivity. The addition of Al2O3 favored the formation of the secondary phase, limiting grain growth severely. The addition of ZnO minimized the formation of the secondary phase and promoted liquid phase formation, which in turn favored densification from as early as 1300⁰C, but effective grain growth occurred only at 1600⁰C, reaching an average grain size of 2.70 μm. However, the presence of liquid phase lead to grain boundaries with a blocking effect on protonic movement. Yttrium-Barium cuprate (YBC) worked effectively as sintering additive, leading to samples with densification higher than 95% after sintering at 1300⁰C and free of the yttrium-rich secondary phase. The best electrical performance was obtained with samples sintered at 1600⁰C, with a mean grain size of 2.40 μm, non-blocking grain boundary, and total proton conductivity of 9.0x10-3S.cm-1 at 500⁰C, which is about 20% higher than samples without additives. |
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Wendler, Leonardo PachecoSouza, Dulcina Maria Pinatti Ferreira dehttp://lattes.cnpq.br/4100119317525940http://lattes.cnpq.br/709405058616684159e53c88-2619-4ab4-8afd-6ff48ef949392019-01-29T12:41:48Z2019-01-29T12:41:48Z2018-11-12WENDLER, Leonardo Pacheco. Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ. 2018. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10874.https://repositorio.ufscar.br/handle/ufscar/10874In this thesis, we investigated the production of Yttrium-doped Barium Zirconate proton-conducting electrolytes with 20 at.% of Yttrium (BaZr0.8Y0.2O3-δ) via solid state reaction. The great challenge presented by this material is its refractory nature, which limits densification as well as grain growth at temperatures below 1700⁰C. The influence of sintering additives on the microstructural development and on the formation of desired phase were also investigated. The literature is lacking on this subject, since there is no consensus concerning the mechanisms of action of sintering additives, and most times, ceramic processing fundaments are not taken in to consideration. In this thesis Aluminum oxide, Zinc oxide and Yttrium-Barium cuprate were selected as additives, being that the latter has not yet been reported in the literature. Compositions without additives were also prepared for comparison purposes. Samples with densification greater than 97% after sintering at 1600⁰C were obtained even without sintering additives and with a mean grain size of 1.40 μm. The results obtained in this thesis show that the real purpose of using certain sintering additives is to affect the formation of yttrium-rich secondary crystalline phase, which remains in grain boundary, hinders grain growth, and damages electrical conductivity. The addition of Al2O3 favored the formation of the secondary phase, limiting grain growth severely. The addition of ZnO minimized the formation of the secondary phase and promoted liquid phase formation, which in turn favored densification from as early as 1300⁰C, but effective grain growth occurred only at 1600⁰C, reaching an average grain size of 2.70 μm. However, the presence of liquid phase lead to grain boundaries with a blocking effect on protonic movement. Yttrium-Barium cuprate (YBC) worked effectively as sintering additive, leading to samples with densification higher than 95% after sintering at 1300⁰C and free of the yttrium-rich secondary phase. The best electrical performance was obtained with samples sintered at 1600⁰C, with a mean grain size of 2.40 μm, non-blocking grain boundary, and total proton conductivity of 9.0x10-3S.cm-1 at 500⁰C, which is about 20% higher than samples without additives.Nesta tese foi investigada a obtenção do eletrólito sólido condutor protônico Zirconato de Bário dopado com 20% atômico de Ítrio, BaZr0,8Y0,2O3-δ, via processamento cerâmico convencional. A grande objeção a este eletrólito é sua refratariedade, que limita a densificação e também o crescimento de grão em temperaturas inferiores a 1700⁰C. Foi investigada também a influência de aditivos de sinterização no desenvolvimento microestrutural e da fase de interesse. A literatura mostra-se falha nesta área, visto que não existe consenso nos mecanismos de atuação dos aditivos de sinterização, e na maioria das vezes, não são aplicados os fundamentos de processamento cerâmico. Nesta tese, óxido de alumínio, óxido de zinco e cuprato de ítrio e bário foram investigados como aditivos, sendo este último não reportado na literatura. Composição livre de aditivo também foi preparada para comparação. Amostras com densificação maior que 97% após sinterização a 1600⁰C foram obtidas sem aditivos de sinterização e com tamanho médio de grão de 1,40μm. Os resultados obtidos nesta tese mostram que a real necessidade do uso de aditivos de sinterização é inibir a formação de fase cristalina secundária rica em ítrio que permanece em contorno de grão inibindo o crescimento de grão e limitando a condutividade elétrica. A adição de Al2O3 favoreceu a formação da fase secundária limitando severamente o crescimento de grão. A adição de ZnO minimizou a formação da fase secundária, e promoveu o surgimento de uma fase líquida que favoreceu a densificação a 1300⁰C; mas efetivo crescimento de grão ocorreu na sinterização a 1600⁰C, atingindo tamanho médio de 2,70μm. Contudo, a presença da fase líquida gerou contorno de grão bloqueante ao movimento protônico. Cuprato de bário e ítrio (YBC) teve um excelente desempenho como aditivo de sinterização pois viabilizou a obtenção de amostras com densificação superior a 95% após sinterização a 1300⁰C e livre da fase secundária rica em ítrio. O melhor desempenho elétrico foi obtido para amostra sinterizada a 1600⁰C, com tamanho médio de grão de 2,40μm, contorno de grão não bloqueante ao movimento protônico e condutividade protônica total de 9,0x10-3S.cm-1 a 500⁰C que significa cerca de 20% maior que a amostra sem aditivo.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)CNPq: 140451/2014-5CAPES: Código do Financiamento 001porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBZY20Condutor protônicoCaCOSAditivos de sinterizaçãoBZY20Protonic conductorSOFCSintering aidsENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOSENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS::CERAMICOSSeleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δSintering aids selection and ceramic processing for microstructural optimization of BaZr0,8Y0,2O3-δ solid electrolytesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisOnline60060070fa011e-1108-4239-97ab-fe5cd4b2d233info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALTese_LeonardoPachecoWendler.pdfTese_LeonardoPachecoWendler.pdfTeseapplication/pdf29421479https://repositorio.ufscar.br/bitstream/ufscar/10874/1/Tese_LeonardoPachecoWendler.pdf6451a099b4938e88cac3abf7a8fa8c0dMD51LICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ |
dc.title.alternative.eng.fl_str_mv |
Sintering aids selection and ceramic processing for microstructural optimization of BaZr0,8Y0,2O3-δ solid electrolytes |
title |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ |
spellingShingle |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ Wendler, Leonardo Pacheco BZY20 Condutor protônico CaCOS Aditivos de sinterização BZY20 Protonic conductor SOFC Sintering aids ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS::CERAMICOS |
title_short |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ |
title_full |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ |
title_fullStr |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ |
title_full_unstemmed |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ |
title_sort |
Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ |
author |
Wendler, Leonardo Pacheco |
author_facet |
Wendler, Leonardo Pacheco |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/7094050586166841 |
dc.contributor.author.fl_str_mv |
Wendler, Leonardo Pacheco |
dc.contributor.advisor1.fl_str_mv |
Souza, Dulcina Maria Pinatti Ferreira de |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/4100119317525940 |
dc.contributor.authorID.fl_str_mv |
59e53c88-2619-4ab4-8afd-6ff48ef94939 |
contributor_str_mv |
Souza, Dulcina Maria Pinatti Ferreira de |
dc.subject.por.fl_str_mv |
BZY20 Condutor protônico CaCOS Aditivos de sinterização |
topic |
BZY20 Condutor protônico CaCOS Aditivos de sinterização BZY20 Protonic conductor SOFC Sintering aids ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS::CERAMICOS |
dc.subject.eng.fl_str_mv |
BZY20 Protonic conductor SOFC Sintering aids |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS::CERAMICOS |
description |
In this thesis, we investigated the production of Yttrium-doped Barium Zirconate proton-conducting electrolytes with 20 at.% of Yttrium (BaZr0.8Y0.2O3-δ) via solid state reaction. The great challenge presented by this material is its refractory nature, which limits densification as well as grain growth at temperatures below 1700⁰C. The influence of sintering additives on the microstructural development and on the formation of desired phase were also investigated. The literature is lacking on this subject, since there is no consensus concerning the mechanisms of action of sintering additives, and most times, ceramic processing fundaments are not taken in to consideration. In this thesis Aluminum oxide, Zinc oxide and Yttrium-Barium cuprate were selected as additives, being that the latter has not yet been reported in the literature. Compositions without additives were also prepared for comparison purposes. Samples with densification greater than 97% after sintering at 1600⁰C were obtained even without sintering additives and with a mean grain size of 1.40 μm. The results obtained in this thesis show that the real purpose of using certain sintering additives is to affect the formation of yttrium-rich secondary crystalline phase, which remains in grain boundary, hinders grain growth, and damages electrical conductivity. The addition of Al2O3 favored the formation of the secondary phase, limiting grain growth severely. The addition of ZnO minimized the formation of the secondary phase and promoted liquid phase formation, which in turn favored densification from as early as 1300⁰C, but effective grain growth occurred only at 1600⁰C, reaching an average grain size of 2.70 μm. However, the presence of liquid phase lead to grain boundaries with a blocking effect on protonic movement. Yttrium-Barium cuprate (YBC) worked effectively as sintering additive, leading to samples with densification higher than 95% after sintering at 1300⁰C and free of the yttrium-rich secondary phase. The best electrical performance was obtained with samples sintered at 1600⁰C, with a mean grain size of 2.40 μm, non-blocking grain boundary, and total proton conductivity of 9.0x10-3S.cm-1 at 500⁰C, which is about 20% higher than samples without additives. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-11-12 |
dc.date.accessioned.fl_str_mv |
2019-01-29T12:41:48Z |
dc.date.available.fl_str_mv |
2019-01-29T12:41:48Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/doctoralThesis |
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doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
WENDLER, Leonardo Pacheco. Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ. 2018. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10874. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/10874 |
identifier_str_mv |
WENDLER, Leonardo Pacheco. Seleção de aditivos de sinterização e processamento cerâmico visando otimização da microestrutura do eletróllto sólido BaZr0,8Y0,2O3-δ. 2018. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10874. |
url |
https://repositorio.ufscar.br/handle/ufscar/10874 |
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por |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
dc.publisher.initials.fl_str_mv |
UFSCar |
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Universidade Federal de São Carlos Câmpus São Carlos |
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