Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/20077
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Carvalho, R. G. | pt |
dc.contributor.author | Pires, M. S. | pt |
dc.contributor.author | Fernandes, A. J. S. | pt |
dc.contributor.author | Silva, R. F. | pt |
dc.contributor.author | Costa, F. M. | pt |
dc.date.accessioned | 2017-12-07T19:34:41Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 0955-2219 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20077 | - |
dc.description.abstract | Eutectic and off-eutectic mullite-zirconia fibres were grown by LFZ (laser floating zone) directional solidification. The microstructure of the mullite-zirconia eutectic fibres varies from planar coupled eutectic (1 mm/h pulling rate) through mullite columnar growth with coarse zirconia inclusions (10 mm/h pulling rate) to faceted mullite eutectic dendrites, which enclose a dispersion of fine zirconia fibrils (100-500 mm/h pulling rates). Near-equilibrium conditions determine the crystallization of monoclinic zirconia and the absence of any amorphous phase, whereas for higher speeds the tetragonal structure is retained and a residual liquid is kept after the eutectic solidification. Similar structural and morphological characteristics are displayed by the mullite-rich off-eutectic composition added to the development of prismatic crystals of mullite primary phase. In opposition, heavy constitutional supercooling takes place in the case of the zirconia-rich off-eutectic fibres, where equiaxed zirconia dendrites soon form as a primary phase, leaving a non-equilibrium mixture of alumina and sillimanite as interdendritic constituent. (C) 2012 Elsevier Ltd. All rights reserved. | pt |
dc.language.iso | eng | pt |
dc.publisher | ELSEVIER SCI LTD | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F64891%2F2009/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | FLOATING-ZONE TECHNIQUE | pt |
dc.subject | GROWN AL2O3-ZRO2(Y2O3) EUTECTICS | pt |
dc.subject | MECHANICAL-PROPERTIES | pt |
dc.subject | RESIDUAL-STRESSES | pt |
dc.subject | CERAMICS | pt |
dc.subject | AL2O3-ZRO2-SIO2 | pt |
dc.subject | MICROSTRUCTURE | pt |
dc.subject | Y2O3-ZRO2 | pt |
dc.subject | STABILITY | pt |
dc.subject | COMPOSITE | pt |
dc.title | Directionally solidified eutectic and off-eutectic mullite zirconia fibres | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 953 | pt |
degois.publication.issue | 5 | pt |
degois.publication.lastPage | 963 | pt |
degois.publication.title | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | pt |
degois.publication.volume | 33 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.jeurceramsoc.2012.09.032 | pt |
dc.identifier.doi | 10.1016/j.jeurceramsoc.2012.09.032 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Directionally solidified eutectic and off-eutectic mullite-zirconia fibres_10.1016j.jeurceramsoc.2012.09.032.pdf | 2.65 MB | Adobe PDF |
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