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Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization

An Al(2)O(3)/5 vol%·ZrO(2)/5 vol%·Y(3)Al(5)O(12) (YAG) tri-phase composite was manufactured by surface modification of an alumina powder with inorganic precursors of the second phases. The bulk materials were produced by die-pressing and pressureless sintering at 1500 °C, obtaining fully dense, homo...

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Autores principales: Palmero, Paola, Pulci, Giovanni, Marra, Francesco, Valente, Teodoro, Montanaro, Laura
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5455268/
https://www.ncbi.nlm.nih.gov/pubmed/28787961
http://dx.doi.org/10.3390/ma8020611
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author Palmero, Paola
Pulci, Giovanni
Marra, Francesco
Valente, Teodoro
Montanaro, Laura
author_facet Palmero, Paola
Pulci, Giovanni
Marra, Francesco
Valente, Teodoro
Montanaro, Laura
author_sort Palmero, Paola
collection PubMed
description An Al(2)O(3)/5 vol%·ZrO(2)/5 vol%·Y(3)Al(5)O(12) (YAG) tri-phase composite was manufactured by surface modification of an alumina powder with inorganic precursors of the second phases. The bulk materials were produced by die-pressing and pressureless sintering at 1500 °C, obtaining fully dense, homogenous samples, with ultra-fine ZrO(2) and YAG grains dispersed in a sub-micronic alumina matrix. The high temperature mechanical properties were investigated by four-point bending tests up to 1500 °C, and the grain size stability was assessed by observing the microstructural evolution of the samples heat treated up to 1700 °C. Dynamic indentation measures were performed on as-sintered and heat-treated Al(2)O(3)/ZrO(2)/YAG samples in order to evaluate the micro-hardness and elastic modulus as a function of re-heating temperature. The high temperature bending tests highlighted a transition from brittle to plastic behavior comprised between 1350 and 1400 °C and a considerable flexural strength reduction at temperatures higher than 1400 °C; moreover, the microstructural investigations carried out on the re-heated samples showed a very limited grain growth up to 1650 °C.
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spelling pubmed-54552682017-07-28 Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization Palmero, Paola Pulci, Giovanni Marra, Francesco Valente, Teodoro Montanaro, Laura Materials (Basel) Article An Al(2)O(3)/5 vol%·ZrO(2)/5 vol%·Y(3)Al(5)O(12) (YAG) tri-phase composite was manufactured by surface modification of an alumina powder with inorganic precursors of the second phases. The bulk materials were produced by die-pressing and pressureless sintering at 1500 °C, obtaining fully dense, homogenous samples, with ultra-fine ZrO(2) and YAG grains dispersed in a sub-micronic alumina matrix. The high temperature mechanical properties were investigated by four-point bending tests up to 1500 °C, and the grain size stability was assessed by observing the microstructural evolution of the samples heat treated up to 1700 °C. Dynamic indentation measures were performed on as-sintered and heat-treated Al(2)O(3)/ZrO(2)/YAG samples in order to evaluate the micro-hardness and elastic modulus as a function of re-heating temperature. The high temperature bending tests highlighted a transition from brittle to plastic behavior comprised between 1350 and 1400 °C and a considerable flexural strength reduction at temperatures higher than 1400 °C; moreover, the microstructural investigations carried out on the re-heated samples showed a very limited grain growth up to 1650 °C. MDPI 2015-02-10 /pmc/articles/PMC5455268/ /pubmed/28787961 http://dx.doi.org/10.3390/ma8020611 Text en © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Palmero, Paola
Pulci, Giovanni
Marra, Francesco
Valente, Teodoro
Montanaro, Laura
Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization
title Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization
title_full Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization
title_fullStr Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization
title_full_unstemmed Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization
title_short Al(2)O(3)/ZrO(2)/Y(3)Al(5)O(12) Composites: A High-Temperature Mechanical Characterization
title_sort al(2)o(3)/zro(2)/y(3)al(5)o(12) composites: a high-temperature mechanical characterization
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5455268/
https://www.ncbi.nlm.nih.gov/pubmed/28787961
http://dx.doi.org/10.3390/ma8020611
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