Lubrificação sólida em meio fluido
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFU |
Texto Completo: | https://repositorio.ufu.br/handle/123456789/14940 |
Resumo: | In order to reduce friction and wear in tribological pairs, the insertion of lubricant between the surfaces in contact separates them by a lubricant film. In most tribological applications, liquid lubricants or grease are used to combat friction and wear. But when service conditions become very severe, solid lubricants may be the only choice to control friction and wear. A combination of solid and liquid lubrication is also feasible and may have a beneficial synergistic effect on the friction and wear performance of sliding surfaces. It occurs particularly in the boundary and elasto-hydrodynamic regime of lubrication. With advent of the powder metallurgy technique, the production of new materials having solid lubricants particles embedded in the metallic matrix became feasible. This work aims to study the combined effect of solid lubrication (sintered composites which contains particles of solid lubricant dispersed in a metallic matrix, by a basic mixing process), with the presence of a liquid lubricant in cooperative lubrication regime in reciprocating sliding wear configuration. A significant reduction, when compared with the addition of liquid lubricant alone, in friction coefficient (25%) was produced by the simultaneous utilization of solid and liquid lubricants, suggesting the existence of a beneficial synergy between the liquid and solid lubricants. This combined action increased significantly the durability of the lubricious regime (3 orders of magnitude), reduced the friction coefficient (about 4x) and the wear rate by 50%. Additionally, the use of triboscopy technique enabled (in an original form) to verify a significant increase in the friction coefficient at the wear marks of a ferrite perlite alloys. This difference between the friction coefficient according to the position was discussed in terms of debris accumulation and a change in lubrication regime, both associated with the reciprocating motion dynamics having been assigned to the first a preponderant role. |
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2016-06-22T18:40:32Z2014-02-182016-06-22T18:40:32Z2013-08-30OLIVEIRA JÚNIOR, Mário Martins de. Solid lubrication in fluid environment. 2013. 95 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013.https://repositorio.ufu.br/handle/123456789/14940In order to reduce friction and wear in tribological pairs, the insertion of lubricant between the surfaces in contact separates them by a lubricant film. In most tribological applications, liquid lubricants or grease are used to combat friction and wear. But when service conditions become very severe, solid lubricants may be the only choice to control friction and wear. A combination of solid and liquid lubrication is also feasible and may have a beneficial synergistic effect on the friction and wear performance of sliding surfaces. It occurs particularly in the boundary and elasto-hydrodynamic regime of lubrication. With advent of the powder metallurgy technique, the production of new materials having solid lubricants particles embedded in the metallic matrix became feasible. This work aims to study the combined effect of solid lubrication (sintered composites which contains particles of solid lubricant dispersed in a metallic matrix, by a basic mixing process), with the presence of a liquid lubricant in cooperative lubrication regime in reciprocating sliding wear configuration. A significant reduction, when compared with the addition of liquid lubricant alone, in friction coefficient (25%) was produced by the simultaneous utilization of solid and liquid lubricants, suggesting the existence of a beneficial synergy between the liquid and solid lubricants. This combined action increased significantly the durability of the lubricious regime (3 orders of magnitude), reduced the friction coefficient (about 4x) and the wear rate by 50%. Additionally, the use of triboscopy technique enabled (in an original form) to verify a significant increase in the friction coefficient at the wear marks of a ferrite perlite alloys. This difference between the friction coefficient according to the position was discussed in terms of debris accumulation and a change in lubrication regime, both associated with the reciprocating motion dynamics having been assigned to the first a preponderant role.Com o intuito de diminuir o atrito e o desgaste nos pares tribológicos, faz-se a inserção de lubrificantes no contato entre as superfícies separando-as por um filme lubrificante. Na maioria das aplicações tribológicas, lubrificantes líquidos ou graxa são utilizados para combater o atrito e o desgaste. Mas quando as condições tornam-se muito severas, os lubrificantes sólidos podem ser a única opção para controlar o atrito e o desgaste. Uma combinação de lubrificantes sólidos e líquidos é viável e pode ter um efeito sinérgico benéfico na redução do atrito e no aumento da resistência ao desgaste das superfícies de deslizamento, em especial nos regimes elasto-hidrodinâmico e limite de lubrificação. Com o advento da técnica de metalurgia do pó, torna-se viável a produção de novos materiais, os quais permitem que o lubrificante sólido seja incorporado ao volume da matriz na etapa de mistura do pó. Este trabalho visa estudar o efeito conjunto da lubrificação sólida (compósitos sinterizados contendo partículas de lubrificante sólido dispersos em uma matriz metálica por um processo de mistura simples) com a presença de um lubrificante líquido em regime de lubrificação conjunta em uma configuração de desgaste por deslizamento alternativo. A utilização simultânea de lubrificantes sólidos e líquidos produziu uma diminuição significativa no coeficiente de atrito (25%) quando comparado com a adição do lubrificante líquido apenas, sugerindo a existência de uma sinergia positiva entre os lubrificantes sólidos e líquidos. Esta ação conjunta aumenta significativamente a durabilidade do regime de lubricidade do sistema (3 ordens de grandeza), reduz o coeficiente de atrito (cerca de 4x) e a taxa de desgaste em 50%. Adicionalmente, a utilização da técnica triboscópica possibilitou, de uma maneira original, constatar um significativo aumento do coeficiente de atrito nas extremidades das marcas de desgaste das ligas ferrito-perlíticas. Esta variação do coeficiente de atrito com a posição foi discutida em termos do acúmulo de debris e da mudança do regime de lubrificação associados com a dinâmica do movimento alternativo, tendo sido atribuído ao primeiro um papel preponderante.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorMestre em Engenharia Mecânicaapplication/pdfporUniversidade Federal de UberlândiaPrograma de Pós-graduação em Engenharia MecânicaUFUBREngenhariasLigas autolubrificantesLubrificação fluidaSinergiaTriboscopiaLubrificação e lubrificantesSelf-lubricating alloysLiquid lubricationTriboscopyCNPQ::ENGENHARIAS::ENGENHARIA MECANICALubrificação sólida em meio fluidoSolid lubrication in fluid environmentinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisMello, José Daniel Biasoli dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783817J1Silva Junior, Washington Martins dahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4769549P2Drago, Valdereshttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783949A3http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4363610A6Oliveira Júnior, Mário Martins deinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFUinstname:Universidade Federal de Uberlândia (UFU)instacron:UFUTHUMBNAILLubrificacaoSolidaMeio.pdf.jpgLubrificacaoSolidaMeio.pdf.jpgGenerated Thumbnailimage/jpeg1241https://repositorio.ufu.br/bitstream/123456789/14940/3/LubrificacaoSolidaMeio.pdf.jpg356625f979302d7adf5abcc73c79d47aMD53ORIGINALLubrificacaoSolidaMeio.pdfapplication/pdf8456191https://repositorio.ufu.br/bitstream/123456789/14940/1/LubrificacaoSolidaMeio.pdf0356e2033f74c516617fa6f372b66df8MD51TEXTLubrificacaoSolidaMeio.pdf.txtLubrificacaoSolidaMeio.pdf.txtExtracted texttext/plain131492https://repositorio.ufu.br/bitstream/123456789/14940/2/LubrificacaoSolidaMeio.pdf.txt93d7d5673ca44d88aeacf3f34ba6e127MD52123456789/149402016-06-23 04:07:59.542oai:repositorio.ufu.br:123456789/14940Repositório InstitucionalONGhttp://repositorio.ufu.br/oai/requestdiinf@dirbi.ufu.bropendoar:2016-06-23T07:07:59Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)false |
dc.title.por.fl_str_mv |
Lubrificação sólida em meio fluido |
dc.title.alternative.eng.fl_str_mv |
Solid lubrication in fluid environment |
title |
Lubrificação sólida em meio fluido |
spellingShingle |
Lubrificação sólida em meio fluido Oliveira Júnior, Mário Martins de Ligas autolubrificantes Lubrificação fluida Sinergia Triboscopia Lubrificação e lubrificantes Self-lubricating alloys Liquid lubrication Triboscopy CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
title_short |
Lubrificação sólida em meio fluido |
title_full |
Lubrificação sólida em meio fluido |
title_fullStr |
Lubrificação sólida em meio fluido |
title_full_unstemmed |
Lubrificação sólida em meio fluido |
title_sort |
Lubrificação sólida em meio fluido |
author |
Oliveira Júnior, Mário Martins de |
author_facet |
Oliveira Júnior, Mário Martins de |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Mello, José Daniel Biasoli de |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783817J1 |
dc.contributor.referee1.fl_str_mv |
Silva Junior, Washington Martins da |
dc.contributor.referee1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4769549P2 |
dc.contributor.referee2.fl_str_mv |
Drago, Valderes |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783949A3 |
dc.contributor.authorLattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4363610A6 |
dc.contributor.author.fl_str_mv |
Oliveira Júnior, Mário Martins de |
contributor_str_mv |
Mello, José Daniel Biasoli de Silva Junior, Washington Martins da Drago, Valderes |
dc.subject.por.fl_str_mv |
Ligas autolubrificantes Lubrificação fluida Sinergia Triboscopia Lubrificação e lubrificantes |
topic |
Ligas autolubrificantes Lubrificação fluida Sinergia Triboscopia Lubrificação e lubrificantes Self-lubricating alloys Liquid lubrication Triboscopy CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
dc.subject.eng.fl_str_mv |
Self-lubricating alloys Liquid lubrication Triboscopy |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
description |
In order to reduce friction and wear in tribological pairs, the insertion of lubricant between the surfaces in contact separates them by a lubricant film. In most tribological applications, liquid lubricants or grease are used to combat friction and wear. But when service conditions become very severe, solid lubricants may be the only choice to control friction and wear. A combination of solid and liquid lubrication is also feasible and may have a beneficial synergistic effect on the friction and wear performance of sliding surfaces. It occurs particularly in the boundary and elasto-hydrodynamic regime of lubrication. With advent of the powder metallurgy technique, the production of new materials having solid lubricants particles embedded in the metallic matrix became feasible. This work aims to study the combined effect of solid lubrication (sintered composites which contains particles of solid lubricant dispersed in a metallic matrix, by a basic mixing process), with the presence of a liquid lubricant in cooperative lubrication regime in reciprocating sliding wear configuration. A significant reduction, when compared with the addition of liquid lubricant alone, in friction coefficient (25%) was produced by the simultaneous utilization of solid and liquid lubricants, suggesting the existence of a beneficial synergy between the liquid and solid lubricants. This combined action increased significantly the durability of the lubricious regime (3 orders of magnitude), reduced the friction coefficient (about 4x) and the wear rate by 50%. Additionally, the use of triboscopy technique enabled (in an original form) to verify a significant increase in the friction coefficient at the wear marks of a ferrite perlite alloys. This difference between the friction coefficient according to the position was discussed in terms of debris accumulation and a change in lubrication regime, both associated with the reciprocating motion dynamics having been assigned to the first a preponderant role. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-08-30 |
dc.date.available.fl_str_mv |
2014-02-18 2016-06-22T18:40:32Z |
dc.date.accessioned.fl_str_mv |
2016-06-22T18:40:32Z |
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 |
OLIVEIRA JÚNIOR, Mário Martins de. Solid lubrication in fluid environment. 2013. 95 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufu.br/handle/123456789/14940 |
identifier_str_mv |
OLIVEIRA JÚNIOR, Mário Martins de. Solid lubrication in fluid environment. 2013. 95 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013. |
url |
https://repositorio.ufu.br/handle/123456789/14940 |
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 Federal de Uberlândia |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Engenharia Mecânica |
dc.publisher.initials.fl_str_mv |
UFU |
dc.publisher.country.fl_str_mv |
BR |
dc.publisher.department.fl_str_mv |
Engenharias |
publisher.none.fl_str_mv |
Universidade Federal de Uberlândia |
dc.source.none.fl_str_mv |
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UFU |
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