Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals

Detalhes bibliográficos
Autor(a) principal: Camargo Junior, S. S.
Data de Publicação: 2005
Outros Autores: Gomes, J. R., Carrapichano, J. M., Silva, R. F., Achete, C. A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/6132
Resumo: Amorphous silicon carbide (a-SiC) and silicon-incorporated diamond-like carbon films (DLC-Si) were evaluated as protective and friction reduction coatings onto Si3N4 rings. Unlubricated tribological tests were performed with a pin-on-disk apparatus against stainless steel pins with loads ranging from 3 N to 55 N and sliding velocities from 0.2 m/s to 1.0 m/s under ambient air and 50-60% relative humidity. At the lowest loads, a-SiC coatings present a considerable improvement with respect to the behavior of uncoated disks since the friction coefficient is reduced to about 0.2 and the system is able to run stably for thousands of meters. At higher loads, however, a-SiC coatings fail. DLC-Si coated rings, on the other hand, presented for loads up to 10 N a steady state friction coefficient below 0.1 and very low wear rates. The lowest steady-state mean friction coefficient value of only 0.055 was obtained with a sliding velocity of 0.5 m/s. For higher loads in the range of 20 N the friction coefficient drops to values around 0.1 but no steady state is reached. For the highest loads of over 50 N a catastrophic behavior is observed. Typically, wear rates below 5 x 10-6 mm3/N.m and 2 x 10-7 mm3/N.m were obtained for the ceramic rings and pins, respectively, with a load of 10 N and a sliding velocity of 0.5 m/s. Analysis of the steel pin contact surface by SEM-EDS and Auger spectroscopy revealed the formation of an adherent tribo-layer mainly composed by Si, C and O. The unique structure of DLC-Si films is thought to be responsible for the formation of the tribo-layer.
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spelling Silicon-incorporated diamond-like coatings for Si3N4 mechanical sealsAmorphous silicon carbideDiamond-like carbon filmsSi3N4 ringsSi N rings 3 4Science & TechnologyAmorphous silicon carbide (a-SiC) and silicon-incorporated diamond-like carbon films (DLC-Si) were evaluated as protective and friction reduction coatings onto Si3N4 rings. Unlubricated tribological tests were performed with a pin-on-disk apparatus against stainless steel pins with loads ranging from 3 N to 55 N and sliding velocities from 0.2 m/s to 1.0 m/s under ambient air and 50-60% relative humidity. At the lowest loads, a-SiC coatings present a considerable improvement with respect to the behavior of uncoated disks since the friction coefficient is reduced to about 0.2 and the system is able to run stably for thousands of meters. At higher loads, however, a-SiC coatings fail. DLC-Si coated rings, on the other hand, presented for loads up to 10 N a steady state friction coefficient below 0.1 and very low wear rates. The lowest steady-state mean friction coefficient value of only 0.055 was obtained with a sliding velocity of 0.5 m/s. For higher loads in the range of 20 N the friction coefficient drops to values around 0.1 but no steady state is reached. For the highest loads of over 50 N a catastrophic behavior is observed. Typically, wear rates below 5 x 10-6 mm3/N.m and 2 x 10-7 mm3/N.m were obtained for the ceramic rings and pins, respectively, with a load of 10 N and a sliding velocity of 0.5 m/s. Analysis of the steel pin contact surface by SEM-EDS and Auger spectroscopy revealed the formation of an adherent tribo-layer mainly composed by Si, C and O. The unique structure of DLC-Si films is thought to be responsible for the formation of the tribo-layer.ElsevierUniversidade do MinhoCamargo Junior, S. S.Gomes, J. R.Carrapichano, J. M.Silva, R. F.Achete, C. A.2005-112005-11-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/6132eng"Thin solid films". ISSN 0040-6090. 482:2 (Nov. 2005) 221-225.0040-609010.1016/j.tsf.2004.11.149info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:11:49Zoai:repositorium.sdum.uminho.pt:1822/6132Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:03:38.745492Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
title Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
spellingShingle Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
Camargo Junior, S. S.
Amorphous silicon carbide
Diamond-like carbon films
Si3N4 rings
Si N rings 3 4
Science & Technology
title_short Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
title_full Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
title_fullStr Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
title_full_unstemmed Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
title_sort Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals
author Camargo Junior, S. S.
author_facet Camargo Junior, S. S.
Gomes, J. R.
Carrapichano, J. M.
Silva, R. F.
Achete, C. A.
author_role author
author2 Gomes, J. R.
Carrapichano, J. M.
Silva, R. F.
Achete, C. A.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Camargo Junior, S. S.
Gomes, J. R.
Carrapichano, J. M.
Silva, R. F.
Achete, C. A.
dc.subject.por.fl_str_mv Amorphous silicon carbide
Diamond-like carbon films
Si3N4 rings
Si N rings 3 4
Science & Technology
topic Amorphous silicon carbide
Diamond-like carbon films
Si3N4 rings
Si N rings 3 4
Science & Technology
description Amorphous silicon carbide (a-SiC) and silicon-incorporated diamond-like carbon films (DLC-Si) were evaluated as protective and friction reduction coatings onto Si3N4 rings. Unlubricated tribological tests were performed with a pin-on-disk apparatus against stainless steel pins with loads ranging from 3 N to 55 N and sliding velocities from 0.2 m/s to 1.0 m/s under ambient air and 50-60% relative humidity. At the lowest loads, a-SiC coatings present a considerable improvement with respect to the behavior of uncoated disks since the friction coefficient is reduced to about 0.2 and the system is able to run stably for thousands of meters. At higher loads, however, a-SiC coatings fail. DLC-Si coated rings, on the other hand, presented for loads up to 10 N a steady state friction coefficient below 0.1 and very low wear rates. The lowest steady-state mean friction coefficient value of only 0.055 was obtained with a sliding velocity of 0.5 m/s. For higher loads in the range of 20 N the friction coefficient drops to values around 0.1 but no steady state is reached. For the highest loads of over 50 N a catastrophic behavior is observed. Typically, wear rates below 5 x 10-6 mm3/N.m and 2 x 10-7 mm3/N.m were obtained for the ceramic rings and pins, respectively, with a load of 10 N and a sliding velocity of 0.5 m/s. Analysis of the steel pin contact surface by SEM-EDS and Auger spectroscopy revealed the formation of an adherent tribo-layer mainly composed by Si, C and O. The unique structure of DLC-Si films is thought to be responsible for the formation of the tribo-layer.
publishDate 2005
dc.date.none.fl_str_mv 2005-11
2005-11-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/6132
url http://hdl.handle.net/1822/6132
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Thin solid films". ISSN 0040-6090. 482:2 (Nov. 2005) 221-225.
0040-6090
10.1016/j.tsf.2004.11.149
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 Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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