Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/219615 |
Resumo: | In surface engineering, new coatings and deposition techniques for decreasing wear have been proposed. However, the tribological behaviors of these coatings under lubricated sliding with biodegradable oils are unknown. The objective of this study was to evaluate the tribological behaviors of two hydraulic biodegradable oils, namely hydraulic environmental ester oil synthetic (HEES) and hydraulic oil environmental polyalphaolefn (HEPR), with hydraulic mineral oil (HLP), using a pin-on-disk tribometer. In the sliding tests, a Cu–35Zn sphere against a fat surface is coated with WC–10Co4Cr alloy using a HVOF thermal spray. The Stribeck curve was used to evaluate the performances of the lubricants. The coefcient of friction, the contact pressure, and the flm thickness were determined. In addition, the coefcient of wear of the sphere was evaluated, and the oil with the lowest value was identifed, which was HEPR in this case. In long-term tests, HEPR was afected by the stick–slip phenomenon, which increased the coefcients of friction and wear. Furthermore, the mechanism of adhesion of the sphere on the disk was more evident with the use of HEES compared to HLP. The highest concentrations of Zn and P and the pressure–viscosity coefcient value, which was detected in the mineral oil, caused friction reduction and lower damage to the surfaces. Therefore, it is important to evaluate the tribological conditions of synthetic bio-lubricants for applications in hydraulic systems. |
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Castro, Richard de MedeirosCuri, Elvys Isaías MercadoInácio, Luiz Fernando FeltrinRocha, Alexandre da Silva2021-04-08T04:17:41Z20201678-5878http://hdl.handle.net/10183/219615001123528In surface engineering, new coatings and deposition techniques for decreasing wear have been proposed. However, the tribological behaviors of these coatings under lubricated sliding with biodegradable oils are unknown. The objective of this study was to evaluate the tribological behaviors of two hydraulic biodegradable oils, namely hydraulic environmental ester oil synthetic (HEES) and hydraulic oil environmental polyalphaolefn (HEPR), with hydraulic mineral oil (HLP), using a pin-on-disk tribometer. In the sliding tests, a Cu–35Zn sphere against a fat surface is coated with WC–10Co4Cr alloy using a HVOF thermal spray. The Stribeck curve was used to evaluate the performances of the lubricants. The coefcient of friction, the contact pressure, and the flm thickness were determined. In addition, the coefcient of wear of the sphere was evaluated, and the oil with the lowest value was identifed, which was HEPR in this case. In long-term tests, HEPR was afected by the stick–slip phenomenon, which increased the coefcients of friction and wear. Furthermore, the mechanism of adhesion of the sphere on the disk was more evident with the use of HEES compared to HLP. The highest concentrations of Zn and P and the pressure–viscosity coefcient value, which was detected in the mineral oil, caused friction reduction and lower damage to the surfaces. Therefore, it is important to evaluate the tribological conditions of synthetic bio-lubricants for applications in hydraulic systems.application/pdfengJournal of the Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro. Vol. 42, n. 2 (2020), 20 p.Óleo hidráulico biodegradávelLubrificaçãoTribologiaBiodegradable oilLubrication regimesStribeck curveCoefcient of friction and wearCu–35ZnWC–10Co4CrAnalysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curveinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001123528.pdf.txt001123528.pdf.txtExtracted Texttext/plain83534http://www.lume.ufrgs.br/bitstream/10183/219615/2/001123528.pdf.txt5dbc50c1a4393b0784cf2cdf4bbdd76eMD52ORIGINAL001123528.pdfTexto completo (inglês)application/pdf3079087http://www.lume.ufrgs.br/bitstream/10183/219615/1/001123528.pdf34d633076205d3bd53119d033bcabc8aMD5110183/2196152021-05-07 05:05:56.315687oai:www.lume.ufrgs.br:10183/219615Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-05-07T08:05:56Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve |
title |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve |
spellingShingle |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve Castro, Richard de Medeiros Óleo hidráulico biodegradável Lubrificação Tribologia Biodegradable oil Lubrication regimes Stribeck curve Coefcient of friction and wear Cu–35Zn WC–10Co4Cr |
title_short |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve |
title_full |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve |
title_fullStr |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve |
title_full_unstemmed |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve |
title_sort |
Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve |
author |
Castro, Richard de Medeiros |
author_facet |
Castro, Richard de Medeiros Curi, Elvys Isaías Mercado Inácio, Luiz Fernando Feltrin Rocha, Alexandre da Silva |
author_role |
author |
author2 |
Curi, Elvys Isaías Mercado Inácio, Luiz Fernando Feltrin Rocha, Alexandre da Silva |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Castro, Richard de Medeiros Curi, Elvys Isaías Mercado Inácio, Luiz Fernando Feltrin Rocha, Alexandre da Silva |
dc.subject.por.fl_str_mv |
Óleo hidráulico biodegradável Lubrificação Tribologia |
topic |
Óleo hidráulico biodegradável Lubrificação Tribologia Biodegradable oil Lubrication regimes Stribeck curve Coefcient of friction and wear Cu–35Zn WC–10Co4Cr |
dc.subject.eng.fl_str_mv |
Biodegradable oil Lubrication regimes Stribeck curve Coefcient of friction and wear Cu–35Zn WC–10Co4Cr |
description |
In surface engineering, new coatings and deposition techniques for decreasing wear have been proposed. However, the tribological behaviors of these coatings under lubricated sliding with biodegradable oils are unknown. The objective of this study was to evaluate the tribological behaviors of two hydraulic biodegradable oils, namely hydraulic environmental ester oil synthetic (HEES) and hydraulic oil environmental polyalphaolefn (HEPR), with hydraulic mineral oil (HLP), using a pin-on-disk tribometer. In the sliding tests, a Cu–35Zn sphere against a fat surface is coated with WC–10Co4Cr alloy using a HVOF thermal spray. The Stribeck curve was used to evaluate the performances of the lubricants. The coefcient of friction, the contact pressure, and the flm thickness were determined. In addition, the coefcient of wear of the sphere was evaluated, and the oil with the lowest value was identifed, which was HEPR in this case. In long-term tests, HEPR was afected by the stick–slip phenomenon, which increased the coefcients of friction and wear. Furthermore, the mechanism of adhesion of the sphere on the disk was more evident with the use of HEES compared to HLP. The highest concentrations of Zn and P and the pressure–viscosity coefcient value, which was detected in the mineral oil, caused friction reduction and lower damage to the surfaces. Therefore, it is important to evaluate the tribological conditions of synthetic bio-lubricants for applications in hydraulic systems. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020 |
dc.date.accessioned.fl_str_mv |
2021-04-08T04:17:41Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/other |
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info:eu-repo/semantics/publishedVersion |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/219615 |
dc.identifier.issn.pt_BR.fl_str_mv |
1678-5878 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001123528 |
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url |
http://hdl.handle.net/10183/219615 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro. Vol. 42, n. 2 (2020), 20 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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