Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações do Mackenzie |
Texto Completo: | http://dspace.mackenzie.br/handle/10899/24187 |
Resumo: | This paper studies the effects in a copper (Cu) alloy with the addition of Nickel (Ni), Silver (Ag) and Yttria (Y2O3), the metal-ceramic (cermet) alloy was manufactured by Powder Metallurgy (PM), this technique was chosen because it is advantageous when working with alloy elements with large difference in melting point, vapor pressure and density. It was used with the intention of creating a composite with good mechanical and electrical strength, capable to be measured by analyzing samples (including fractography) besides the usual experimental procedures of hardness and current tests. The results aim to explore some characteristics of this alloy as well as investigate and pursue such physical properties to meet current technology needs principally related as an option to anode of solid fuels or electrical contact in low temperatures. In general the study was satisfactory as it presents significant data especially in regard to the interaction of some physical characteristics on microscopic level of the components studied in this cermet that is still unknown and requires continued research. A fact that can be highlighted is the apparent lack of diffusion of Yttria particles that, as noted in the electronic mapping, were lodged between copper particles causing a not very homogeneous dispersion of the components in the alloy. This factor was most likely caused by low effectiveness compression and sintering of the samples, also impacting significantly on the hardness values and the conductivity values of about 29% IACS which measured in ambient temperature for metal alloys would be low, but for this metal-ceramic alloy is reasonable, as they have some inverse physical properties when exposed to cold temperatures resulting in lower resistivity values and higher critical temperatures making it suitable for low temperature electrical contacts. Y3 (Cu 90%/ Ni5%/ Ag3%/ Y2O32%) and Y6 (Cu 90%/ Ni7%/ Ag0%/ Y2O33%) samples with high concentration of Ni and low concentrations of Y2O3 had higher hardness values, and Y7 (Cu 95%/ Ni0%/ Ag0%/ Y2O35%) sample with high Cu concentration presented higher conductivity between all the samples. |
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2016-03-15T19:36:49Z2020-05-28T18:07:29Z2015-04-292020-05-28T18:07:29Z2015-01-30PEREIRA, Rafael Mezher Silva. Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3. 2015. 58 f. Dissertação (Mestrado em Engenharia de Materiais) - Universidade Presbiteriana Mackenzie, São Paulo, 2015.http://dspace.mackenzie.br/handle/10899/24187This paper studies the effects in a copper (Cu) alloy with the addition of Nickel (Ni), Silver (Ag) and Yttria (Y2O3), the metal-ceramic (cermet) alloy was manufactured by Powder Metallurgy (PM), this technique was chosen because it is advantageous when working with alloy elements with large difference in melting point, vapor pressure and density. It was used with the intention of creating a composite with good mechanical and electrical strength, capable to be measured by analyzing samples (including fractography) besides the usual experimental procedures of hardness and current tests. The results aim to explore some characteristics of this alloy as well as investigate and pursue such physical properties to meet current technology needs principally related as an option to anode of solid fuels or electrical contact in low temperatures. In general the study was satisfactory as it presents significant data especially in regard to the interaction of some physical characteristics on microscopic level of the components studied in this cermet that is still unknown and requires continued research. A fact that can be highlighted is the apparent lack of diffusion of Yttria particles that, as noted in the electronic mapping, were lodged between copper particles causing a not very homogeneous dispersion of the components in the alloy. This factor was most likely caused by low effectiveness compression and sintering of the samples, also impacting significantly on the hardness values and the conductivity values of about 29% IACS which measured in ambient temperature for metal alloys would be low, but for this metal-ceramic alloy is reasonable, as they have some inverse physical properties when exposed to cold temperatures resulting in lower resistivity values and higher critical temperatures making it suitable for low temperature electrical contacts. Y3 (Cu 90%/ Ni5%/ Ag3%/ Y2O32%) and Y6 (Cu 90%/ Ni7%/ Ag0%/ Y2O33%) samples with high concentration of Ni and low concentrations of Y2O3 had higher hardness values, and Y7 (Cu 95%/ Ni0%/ Ag0%/ Y2O35%) sample with high Cu concentration presented higher conductivity between all the samples.Este trabalho estuda os efeitos da de Níquel (Ni), Prata (Ag) e Ítria (Y2O3) em uma liga de Cobre (Cu). Esta liga metal-cerâmica (cermeto) foi fabricada através da Metalurgia do Pó (MP), que foi escolhida pois é vantajosa quando se trabalha com ligas de elementos com grande diferença de ponto de fusão, pressão de vapor e densidade. Esta técnica foi utilizada objetivando criar um composto com resistência mecânica e elétrica e que pudesse ser mensurado e caracterizado através da análise de amostras por meio de procedimentos experimentais usuais de dureza e de corrente elétrica assim como fratografia. Os resultados mostram e exploram algumas características interessantes desta liga, e ao investigar tais propriedades físicas objetiva-se satisfazer as necessidades tecnológicas atuais principalmente como opções para uso como ânodo de combustível sólido ou como contato elétrico para baixas temperaturas. De modo geral o estudo foi satisfatório já que apresenta dados marcantes principalmente no que se diz respeito à interação de algumas características físicas a nível microscópico dos componentes estudados neste cermeto que ainda é pouco conhecido e requer continuidade de pesquisa. Um fato que pode ser ressaltado é a aparente não difusão das partículas de Ítria que, como observado nos mapeamentos eletrônicos, ficaram alojadas entre os aglutinados de cobre fazendo com que a dispersão dos componentes na liga não fosse homogênea. Tal fator muito provavelmente foi causado pela baixa eficácia da compactação e também da sinterização das amostras o que impactou consideravelmente nos valores de dureza que ficaram abaixo do esperado, assim como os valores de condutividade por volta de 29 %IACS que medidos a temperatura ambiente para uma liga exclusivamente metálica seria considerado baixo, mas no caso desta liga metal-cerâmica é bastante razoável. Já que possuem algumas propriedades físicas inversas quando submetidas a baixas temperaturas resultando em valores de resistividade mais baixos e temperaturas críticas mais elevadas ideais para contatos elétricos a baixa temperatura. As amostras Y3 (Cu 90%/ Ni5%/ Ag3%/ Y2O32%) e Y6 (Cu 90%/ Ni7%/ Ag0%/ Y2O33%) com alta concentração de Ni e baixa concentração de Y2O3 apresentaram maior dureza, e a amostra Y7 (Cu 95%/ Ni0%/ Ag0%/ Y2O35%) com alta concentração de Cu maior condutividade.application/pdfporUniversidade Presbiteriana MackenzieEngenharia de MateriaisUPMBREngenharia de Materiaiscermetometalurgia do pófratografiacombustível sólidocontato elétricocermetpowder metallurgyfractographysolid fuelselectrical contactsCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAMicroestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisMonteiro, Waldemar Alfredohttp://lattes.cnpq.br/0247250750660163Couto, Antonio Augustohttp://lattes.cnpq.br/2893737202813850Andrade, Arnaldo Homobono Paes dehttp://lattes.cnpq.br/1605291530127961http://lattes.cnpq.br/7581179722105825Pereira, Rafael Mezher Silvahttp://tede.mackenzie.br/jspui/retrieve/3617/Rafael%20Mezher%20Silva%20Pereira.pdf.jpghttp://tede.mackenzie.br/jspui/bitstream/tede/1355/1/Rafael%20Mezher%20Silva%20Pereira.pdfinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do Mackenzieinstname:Universidade Presbiteriana Mackenzie (MACKENZIE)instacron:MACKENZIE10899/241872020-05-28 15:07:29.894Biblioteca Digital de Teses e Dissertaçõeshttp://tede.mackenzie.br/jspui/PRI |
dc.title.por.fl_str_mv |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 |
title |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 |
spellingShingle |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 Pereira, Rafael Mezher Silva cermeto metalurgia do pó fratografia combustível sólido contato elétrico cermet powder metallurgy fractography solid fuels electrical contacts CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 |
title_full |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 |
title_fullStr |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 |
title_full_unstemmed |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 |
title_sort |
Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3 |
author |
Pereira, Rafael Mezher Silva |
author_facet |
Pereira, Rafael Mezher Silva |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Monteiro, Waldemar Alfredo |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0247250750660163 |
dc.contributor.referee1.fl_str_mv |
Couto, Antonio Augusto |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/2893737202813850 |
dc.contributor.referee2.fl_str_mv |
Andrade, Arnaldo Homobono Paes de |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/1605291530127961 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/7581179722105825 |
dc.contributor.author.fl_str_mv |
Pereira, Rafael Mezher Silva |
contributor_str_mv |
Monteiro, Waldemar Alfredo Couto, Antonio Augusto Andrade, Arnaldo Homobono Paes de |
dc.subject.por.fl_str_mv |
cermeto metalurgia do pó fratografia combustível sólido contato elétrico |
topic |
cermeto metalurgia do pó fratografia combustível sólido contato elétrico cermet powder metallurgy fractography solid fuels electrical contacts CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.eng.fl_str_mv |
cermet powder metallurgy fractography solid fuels electrical contacts |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
This paper studies the effects in a copper (Cu) alloy with the addition of Nickel (Ni), Silver (Ag) and Yttria (Y2O3), the metal-ceramic (cermet) alloy was manufactured by Powder Metallurgy (PM), this technique was chosen because it is advantageous when working with alloy elements with large difference in melting point, vapor pressure and density. It was used with the intention of creating a composite with good mechanical and electrical strength, capable to be measured by analyzing samples (including fractography) besides the usual experimental procedures of hardness and current tests. The results aim to explore some characteristics of this alloy as well as investigate and pursue such physical properties to meet current technology needs principally related as an option to anode of solid fuels or electrical contact in low temperatures. In general the study was satisfactory as it presents significant data especially in regard to the interaction of some physical characteristics on microscopic level of the components studied in this cermet that is still unknown and requires continued research. A fact that can be highlighted is the apparent lack of diffusion of Yttria particles that, as noted in the electronic mapping, were lodged between copper particles causing a not very homogeneous dispersion of the components in the alloy. This factor was most likely caused by low effectiveness compression and sintering of the samples, also impacting significantly on the hardness values and the conductivity values of about 29% IACS which measured in ambient temperature for metal alloys would be low, but for this metal-ceramic alloy is reasonable, as they have some inverse physical properties when exposed to cold temperatures resulting in lower resistivity values and higher critical temperatures making it suitable for low temperature electrical contacts. Y3 (Cu 90%/ Ni5%/ Ag3%/ Y2O32%) and Y6 (Cu 90%/ Ni7%/ Ag0%/ Y2O33%) samples with high concentration of Ni and low concentrations of Y2O3 had higher hardness values, and Y7 (Cu 95%/ Ni0%/ Ag0%/ Y2O35%) sample with high Cu concentration presented higher conductivity between all the samples. |
publishDate |
2015 |
dc.date.available.fl_str_mv |
2015-04-29 2020-05-28T18:07:29Z |
dc.date.issued.fl_str_mv |
2015-01-30 |
dc.date.accessioned.fl_str_mv |
2016-03-15T19:36:49Z 2020-05-28T18:07:29Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
PEREIRA, Rafael Mezher Silva. Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3. 2015. 58 f. Dissertação (Mestrado em Engenharia de Materiais) - Universidade Presbiteriana Mackenzie, São Paulo, 2015. |
dc.identifier.uri.fl_str_mv |
http://dspace.mackenzie.br/handle/10899/24187 |
identifier_str_mv |
PEREIRA, Rafael Mezher Silva. Microestrutura, fratografia, propriedades elétricas e mecânicas de cermeto de Cu/Ni/Ag/Y2O3. 2015. 58 f. Dissertação (Mestrado em Engenharia de Materiais) - Universidade Presbiteriana Mackenzie, São Paulo, 2015. |
url |
http://dspace.mackenzie.br/handle/10899/24187 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Presbiteriana Mackenzie |
dc.publisher.program.fl_str_mv |
Engenharia de Materiais |
dc.publisher.initials.fl_str_mv |
UPM |
dc.publisher.country.fl_str_mv |
BR |
dc.publisher.department.fl_str_mv |
Engenharia de Materiais |
publisher.none.fl_str_mv |
Universidade Presbiteriana Mackenzie |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações do Mackenzie instname:Universidade Presbiteriana Mackenzie (MACKENZIE) instacron:MACKENZIE |
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Universidade Presbiteriana Mackenzie (MACKENZIE) |
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MACKENZIE |
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MACKENZIE |
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Biblioteca Digital de Teses e Dissertações do Mackenzie |
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Biblioteca Digital de Teses e Dissertações do Mackenzie |
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