Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis

Detalhes bibliográficos
Autor(a) principal: Santos,Claudinei dos
Data de Publicação: 2003
Outros Autores: Strecker,Kurt, Piorino Neto,Francisco, Silva,Olivério Moreira de Macedo, Baldacim,Sandro Aparecido, Silva,Cosme Roberto Moreira da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400006
Resumo: The objective of this work has been to compare the reliability of two Si3N4 ceramics, with Y2O3/Al2O3 or CTR2O3/Al2O3 mixtures as additives, in regard to their 4-point bending strength and to confirm the potential of the rare earth oxide mixture, CTR2O3, produced at FAENQUIL, as an alternative, low cost sinter additive for pure Y2O3 in the sintering of Si3N4 ceramics. The oxide mixture CTR2O3 is a solid solution formed mainly by Y2O3, Er2O3, Yb2O3 and Dy2O3 with other minor constituents and is obtained at a cost of only 20% of pure Y2O3. Samples were sintered by a gas pressure sintering process at 1900 °C under a nitrogen pressure of 1.5 MPa and an isothermal holding time of 2 h. The obtained materials were characterized by their relative density, phase composition and bending strength. The Weibull analysis was used to describe the reliability of these materials. Both materials produced presented relative densities higher than 99.5%t.d., b-Si3N4 and Y3Al5O12 (YAG) as cristalline phases and bending strengths higher than 650 MPa, thus demonstrating similar behaviors regarding their physical, chemical and mechanical characteristics. The statistical analysis of their strength also showed similar results for both materials, with Weibull moduli m of about 15 and characteristic stress values s o of about 700 MPa. These results confirmed the possibility of using the rare earth oxide mixture, CTR2O3, as sinter additive for high performance Si3N4 ceramics, without prejudice of the mechanical properties when compared to Si3N4 ceramics sintered with pure Y2O3.
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spelling Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysisSi3N4rare earth oxidesmechanical propertiesWeibull analysisThe objective of this work has been to compare the reliability of two Si3N4 ceramics, with Y2O3/Al2O3 or CTR2O3/Al2O3 mixtures as additives, in regard to their 4-point bending strength and to confirm the potential of the rare earth oxide mixture, CTR2O3, produced at FAENQUIL, as an alternative, low cost sinter additive for pure Y2O3 in the sintering of Si3N4 ceramics. The oxide mixture CTR2O3 is a solid solution formed mainly by Y2O3, Er2O3, Yb2O3 and Dy2O3 with other minor constituents and is obtained at a cost of only 20% of pure Y2O3. Samples were sintered by a gas pressure sintering process at 1900 °C under a nitrogen pressure of 1.5 MPa and an isothermal holding time of 2 h. The obtained materials were characterized by their relative density, phase composition and bending strength. The Weibull analysis was used to describe the reliability of these materials. Both materials produced presented relative densities higher than 99.5%t.d., b-Si3N4 and Y3Al5O12 (YAG) as cristalline phases and bending strengths higher than 650 MPa, thus demonstrating similar behaviors regarding their physical, chemical and mechanical characteristics. The statistical analysis of their strength also showed similar results for both materials, with Weibull moduli m of about 15 and characteristic stress values s o of about 700 MPa. These results confirmed the possibility of using the rare earth oxide mixture, CTR2O3, as sinter additive for high performance Si3N4 ceramics, without prejudice of the mechanical properties when compared to Si3N4 ceramics sintered with pure Y2O3.ABM, ABC, ABPol2003-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400006Materials Research v.6 n.4 2003reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392003000400006info:eu-repo/semantics/openAccessSantos,Claudinei dosStrecker,KurtPiorino Neto,FranciscoSilva,Olivério Moreira de MacedoBaldacim,Sandro AparecidoSilva,Cosme Roberto Moreira daeng2004-01-19T00:00:00Zoai:scielo:S1516-14392003000400006Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2004-01-19T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
title Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
spellingShingle Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
Santos,Claudinei dos
Si3N4
rare earth oxides
mechanical properties
Weibull analysis
title_short Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
title_full Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
title_fullStr Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
title_full_unstemmed Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
title_sort Evaluation of the reliability of Si3N4-Al2O3 -CTR2O3 ceramics through Weibull analysis
author Santos,Claudinei dos
author_facet Santos,Claudinei dos
Strecker,Kurt
Piorino Neto,Francisco
Silva,Olivério Moreira de Macedo
Baldacim,Sandro Aparecido
Silva,Cosme Roberto Moreira da
author_role author
author2 Strecker,Kurt
Piorino Neto,Francisco
Silva,Olivério Moreira de Macedo
Baldacim,Sandro Aparecido
Silva,Cosme Roberto Moreira da
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Santos,Claudinei dos
Strecker,Kurt
Piorino Neto,Francisco
Silva,Olivério Moreira de Macedo
Baldacim,Sandro Aparecido
Silva,Cosme Roberto Moreira da
dc.subject.por.fl_str_mv Si3N4
rare earth oxides
mechanical properties
Weibull analysis
topic Si3N4
rare earth oxides
mechanical properties
Weibull analysis
description The objective of this work has been to compare the reliability of two Si3N4 ceramics, with Y2O3/Al2O3 or CTR2O3/Al2O3 mixtures as additives, in regard to their 4-point bending strength and to confirm the potential of the rare earth oxide mixture, CTR2O3, produced at FAENQUIL, as an alternative, low cost sinter additive for pure Y2O3 in the sintering of Si3N4 ceramics. The oxide mixture CTR2O3 is a solid solution formed mainly by Y2O3, Er2O3, Yb2O3 and Dy2O3 with other minor constituents and is obtained at a cost of only 20% of pure Y2O3. Samples were sintered by a gas pressure sintering process at 1900 °C under a nitrogen pressure of 1.5 MPa and an isothermal holding time of 2 h. The obtained materials were characterized by their relative density, phase composition and bending strength. The Weibull analysis was used to describe the reliability of these materials. Both materials produced presented relative densities higher than 99.5%t.d., b-Si3N4 and Y3Al5O12 (YAG) as cristalline phases and bending strengths higher than 650 MPa, thus demonstrating similar behaviors regarding their physical, chemical and mechanical characteristics. The statistical analysis of their strength also showed similar results for both materials, with Weibull moduli m of about 15 and characteristic stress values s o of about 700 MPa. These results confirmed the possibility of using the rare earth oxide mixture, CTR2O3, as sinter additive for high performance Si3N4 ceramics, without prejudice of the mechanical properties when compared to Si3N4 ceramics sintered with pure Y2O3.
publishDate 2003
dc.date.none.fl_str_mv 2003-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400006
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400006
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392003000400006
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.6 n.4 2003
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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