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dc.contributor.authorRayón Encinas, Emilio
dc.contributor.authorMoreno, R.
dc.contributor.authorAlcázar, C.
dc.contributor.authorSalvador Moya, Maria Dolores
dc.contributor.authorManjon Herrera, Francisco Javier
dc.contributor.authorJiménez Piqué, Emilio
dc.contributor.authorLlanes Pitarch, Luis Miguel
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.identifier.citationRayón, E. [et al.]. Enhanced hydrothermal resistance of Y-TZP ceramics through colloidal processing. "Journal of the American Ceramic Society", 28 Febrer 2013, vol. 96, núm. 4, p. 1070-1076.
dc.description.abstractTwo commercial zirconia powders with 3 mol% of yttria (TZ3YE and TZ3YS, labeled as ZE and ZS, respectively) sup- plied by Tosoh (Japan) were used for this study. Maximum colloidal stability for ZE was achieved by dispersing the pow- ders in a mixture of water/ethanol of 90:10 (wt/wt) using a sonication probe. The rheological behavior of the suspensions was optimized in terms of solids content ranging from 20 to 33 vol% and sonication time (0 – 6 min), the best results being obtained after 2 min. ZS samples were prepared to a solids loading of 30 vol% in water dispersing with 2 min-sonication. Samples obtained by slip casting in plaster molds were used for dynamic sintering studies, and fully dense and nanostructured specimens were obtained at temperatures of 1300 ° C – 1350 ° C (ZE samples) and 1400 ° C per 2 h (ZS samples). The Hardness ( H ) and Young’s Modulus ( E ) properties of the specimens were studied by nanoindentation technique giving 17 and 250 GPa mean values for H and E , respectively. The specimens were then forced to a low-temperature degradation (LTD) treatment at 130 ° C for 240 h in steps of 60 h. Raman spectroscopy and nanoindentation results of hydrothermally treated samples showed the absence of transformation from tetragonal to monoclinic phase until 180 h whereas the mechanical properties maintained constant even at the sample surface. After 240 h of LTD, the monoclinic phase was detected on all specimens by Raman peaks centered at 180, 191, and 383 cm 1 . The nanoin- dentation study revealed an important loss of mechanical fea- tures reaching 10 and 175 GPa for H and E , respectively. In the case of the ZS specimens, no monoclinic phase is detected after 240 h of LTD treatment and no decay of E or H is detected. The free defect microstructure reached for the ZS specimen revealed a higher hydrothermal resistance so that it is concluded that the excellent behavior against thermal degrada- tion is possible due to the large uniformity obtained by colloi- dal processing rather than the particle size of the starting powders
dc.format.extent7 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials
dc.subject.lcshZirconium oxide
dc.subject.otherSuspensions (fluids)
dc.subject.otherElastic moduli
dc.subject.otherRaman spectroscopy
dc.subject.otherYttrium alloys
dc.titleEnhanced hydrothermal resistance of Y-TZP ceramics through colloidal processing
dc.subject.lemacMaterials ceràmics
dc.contributor.groupUniversitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
local.citation.authorRayón, E.; Moreno, R.; Alcázar, C.; Salvador, M.D.; Manjon, F.; Jimenez, E.; Llanes, L.
local.citation.publicationNameJournal of the American Ceramic Society

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Attribution-NonCommercial-NoDerivs 3.0 Spain
Llevat que s'hi indiqui el contrari, els continguts d'aquesta obra estan subjectes a la llicència de Creative Commons : Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya