Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/8168 https://doi.org/10.1002/ppap.200731402 |
Resumo: | W-S-C films were deposited by non-reactive magnetron sputtering from a carbon target with several pellets of WS2 incrusted in the zone of the preferential erosion. The number of the pellets was changed to modify the carbon content in the films, which varied from 26 up to 70 at.-%. Alloying W-S films with carbon led to a substantial increase in the hardness in the range of 4-10 GPa; the maximum hardness was obtained for the coatings with carbon contents close to 40 at.-%. XRD diffraction patterns showed that there was a loss of crystallinity with the increase of the carbon content in the film. C-contents in the range (37-66 at.-%) were selected for sliding tests (pin-on-disk, 100Cr6 steel ball as a counterpart) carried out in humid air under increasing contact load. The friction coefficient was observed to decrease continuously with increasing load. The wear tracks and wear debris were also analyzed by Raman spectroscopy to understand the structural transformations induced by the increasing load. The friction results were compared with existing models for pure transition metal dichalcogenides (TMD), and it could be concluded that the friction mechanisms of W-S-C coatings fundamentally differ from those of pure TMD. |
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Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing LoadW-S-C films were deposited by non-reactive magnetron sputtering from a carbon target with several pellets of WS2 incrusted in the zone of the preferential erosion. The number of the pellets was changed to modify the carbon content in the films, which varied from 26 up to 70 at.-%. Alloying W-S films with carbon led to a substantial increase in the hardness in the range of 4-10 GPa; the maximum hardness was obtained for the coatings with carbon contents close to 40 at.-%. XRD diffraction patterns showed that there was a loss of crystallinity with the increase of the carbon content in the film. C-contents in the range (37-66 at.-%) were selected for sliding tests (pin-on-disk, 100Cr6 steel ball as a counterpart) carried out in humid air under increasing contact load. The friction coefficient was observed to decrease continuously with increasing load. The wear tracks and wear debris were also analyzed by Raman spectroscopy to understand the structural transformations induced by the increasing load. The friction results were compared with existing models for pure transition metal dichalcogenides (TMD), and it could be concluded that the friction mechanisms of W-S-C coatings fundamentally differ from those of pure TMD.2007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/8168http://hdl.handle.net/10316/8168https://doi.org/10.1002/ppap.200731402engPlasma Processes and Polymers. 4:S1 (2007) S541-S546Polcar, TomasEvaristo, ManuelCavaleiro, Albanoinfo: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:RCAAP2020-05-29T09:42:31Zoai:estudogeral.uc.pt:10316/8168Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:58:31.161605Repositório 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 |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load |
title |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load |
spellingShingle |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load Polcar, Tomas |
title_short |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load |
title_full |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load |
title_fullStr |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load |
title_full_unstemmed |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load |
title_sort |
Friction of Self-Lubricating W-S-C Sputtered Coatings Sliding Under Increasing Load |
author |
Polcar, Tomas |
author_facet |
Polcar, Tomas Evaristo, Manuel Cavaleiro, Albano |
author_role |
author |
author2 |
Evaristo, Manuel Cavaleiro, Albano |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Polcar, Tomas Evaristo, Manuel Cavaleiro, Albano |
description |
W-S-C films were deposited by non-reactive magnetron sputtering from a carbon target with several pellets of WS2 incrusted in the zone of the preferential erosion. The number of the pellets was changed to modify the carbon content in the films, which varied from 26 up to 70 at.-%. Alloying W-S films with carbon led to a substantial increase in the hardness in the range of 4-10 GPa; the maximum hardness was obtained for the coatings with carbon contents close to 40 at.-%. XRD diffraction patterns showed that there was a loss of crystallinity with the increase of the carbon content in the film. C-contents in the range (37-66 at.-%) were selected for sliding tests (pin-on-disk, 100Cr6 steel ball as a counterpart) carried out in humid air under increasing contact load. The friction coefficient was observed to decrease continuously with increasing load. The wear tracks and wear debris were also analyzed by Raman spectroscopy to understand the structural transformations induced by the increasing load. The friction results were compared with existing models for pure transition metal dichalcogenides (TMD), and it could be concluded that the friction mechanisms of W-S-C coatings fundamentally differ from those of pure TMD. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007 |
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/10316/8168 http://hdl.handle.net/10316/8168 https://doi.org/10.1002/ppap.200731402 |
url |
http://hdl.handle.net/10316/8168 https://doi.org/10.1002/ppap.200731402 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Plasma Processes and Polymers. 4:S1 (2007) S541-S546 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
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 |
repository.mail.fl_str_mv |
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