High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/27236 https://doi.org/10.1016/j.surfcoat.2013.04.027 |
Resumo: | Cr-Nb-Al-N coatings with Al content from 0 to 12 at.% were deposited by d.c. reactive magnetron sputtering. The coatings were annealed in protective atmosphere at 800 and 900 °C for 1 h and exposed to air at 800, 900 and 1200 °C for different times. The chemical composition, structure, microstructure, hardness and adhesive/cohesive strength of the coatings, in as-deposited and annealed conditions, were investigated and the oxidation resistance was evaluated. As expected, the Al content increased gradually in the coating with increasing power density in the Al target; nitrogen was kept approximately constant. All coatings exhibited columnar cross section morphology and fcc NaCl-type B1 phase structure. After thermal annealing, an increase in the grain size and a decrease in the lattice parameter were observed, which led to either a decrease in the hardness or lower adhesion/cohesion strength than the as-deposited coatings. The onset oxidation temperature was approx. 900 °C for all coatings. High Al content coatings showed minimum oxidation when exposed to 800 °C for 2 h and to 900 °C for 0.5 h in air. The Al-free and low Al coatings exhibited lower oxidation resistance; Cr2O3 and CrNbO4 coexisting together although signs of the cubic nitride phase were still detected. The increase of Al was beneficial to the improvement of the thermal stability and oxidation resistance of the Cr-Nb-Al-N coatings. |
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High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contentsCr- Nb- Al- N coatingsMechanical propertiesThermal stabilityOxidation resistanceHighCr-Nb-Al-N coatings with Al content from 0 to 12 at.% were deposited by d.c. reactive magnetron sputtering. The coatings were annealed in protective atmosphere at 800 and 900 °C for 1 h and exposed to air at 800, 900 and 1200 °C for different times. The chemical composition, structure, microstructure, hardness and adhesive/cohesive strength of the coatings, in as-deposited and annealed conditions, were investigated and the oxidation resistance was evaluated. As expected, the Al content increased gradually in the coating with increasing power density in the Al target; nitrogen was kept approximately constant. All coatings exhibited columnar cross section morphology and fcc NaCl-type B1 phase structure. After thermal annealing, an increase in the grain size and a decrease in the lattice parameter were observed, which led to either a decrease in the hardness or lower adhesion/cohesion strength than the as-deposited coatings. The onset oxidation temperature was approx. 900 °C for all coatings. High Al content coatings showed minimum oxidation when exposed to 800 °C for 2 h and to 900 °C for 0.5 h in air. The Al-free and low Al coatings exhibited lower oxidation resistance; Cr2O3 and CrNbO4 coexisting together although signs of the cubic nitride phase were still detected. The increase of Al was beneficial to the improvement of the thermal stability and oxidation resistance of the Cr-Nb-Al-N coatings.Elsevier2013-08-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/27236http://hdl.handle.net/10316/27236https://doi.org/10.1016/j.surfcoat.2013.04.027porLI, W. Z. [et al.] - High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents. "Surface and Coatings Technology". ISSN 0257-8972. Vol. 228 (2013) p. 187-1940257-8972http://www.sciencedirect.com/science/article/pii/S025789721300371XLi, W. Z.Polcar, T.Evaristo, M.Cavaleiro, A.info: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:RCAAP2020-05-29T09:42:32Zoai:estudogeral.uc.pt:10316/27236Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:58:36.339060Repositório 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 |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents |
title |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents |
spellingShingle |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents Li, W. Z. Cr- Nb- Al- N coatings Mechanical properties Thermal stability Oxidation resistance High |
title_short |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents |
title_full |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents |
title_fullStr |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents |
title_full_unstemmed |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents |
title_sort |
High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents |
author |
Li, W. Z. |
author_facet |
Li, W. Z. Polcar, T. Evaristo, M. Cavaleiro, A. |
author_role |
author |
author2 |
Polcar, T. Evaristo, M. Cavaleiro, A. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Li, W. Z. Polcar, T. Evaristo, M. Cavaleiro, A. |
dc.subject.por.fl_str_mv |
Cr- Nb- Al- N coatings Mechanical properties Thermal stability Oxidation resistance High |
topic |
Cr- Nb- Al- N coatings Mechanical properties Thermal stability Oxidation resistance High |
description |
Cr-Nb-Al-N coatings with Al content from 0 to 12 at.% were deposited by d.c. reactive magnetron sputtering. The coatings were annealed in protective atmosphere at 800 and 900 °C for 1 h and exposed to air at 800, 900 and 1200 °C for different times. The chemical composition, structure, microstructure, hardness and adhesive/cohesive strength of the coatings, in as-deposited and annealed conditions, were investigated and the oxidation resistance was evaluated. As expected, the Al content increased gradually in the coating with increasing power density in the Al target; nitrogen was kept approximately constant. All coatings exhibited columnar cross section morphology and fcc NaCl-type B1 phase structure. After thermal annealing, an increase in the grain size and a decrease in the lattice parameter were observed, which led to either a decrease in the hardness or lower adhesion/cohesion strength than the as-deposited coatings. The onset oxidation temperature was approx. 900 °C for all coatings. High Al content coatings showed minimum oxidation when exposed to 800 °C for 2 h and to 900 °C for 0.5 h in air. The Al-free and low Al coatings exhibited lower oxidation resistance; Cr2O3 and CrNbO4 coexisting together although signs of the cubic nitride phase were still detected. The increase of Al was beneficial to the improvement of the thermal stability and oxidation resistance of the Cr-Nb-Al-N coatings. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-08-15 |
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/10316/27236 http://hdl.handle.net/10316/27236 https://doi.org/10.1016/j.surfcoat.2013.04.027 |
url |
http://hdl.handle.net/10316/27236 https://doi.org/10.1016/j.surfcoat.2013.04.027 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
LI, W. Z. [et al.] - High temperature properties of the Cr-Nb-Al-N coatings with increasing Al contents. "Surface and Coatings Technology". ISSN 0257-8972. Vol. 228 (2013) p. 187-194 0257-8972 http://www.sciencedirect.com/science/article/pii/S025789721300371X |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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) 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 |
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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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1799133877605761024 |