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Materials 2015, 8(2), 611-624; doi:10.3390/ma8020611

Al2O3/ZrO2/Y3Al5O12 Composites: A High-Temperature Mechanical Characterization

1
Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, INSTM R.U. PoliTO, Laboratorio di Tecnologia ed Ingegnerizzazione dei Materiali Ceramici (LINCE), Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
2
Dipartimento di Ingegneria Chimica Materiali e Ambiente, Sapienza Università di Roma, Laboratorio di Ingegneria dei Trattamenti Superficiali, INSTM, Via Eudossiana, 18, 00184 Roma, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Peter J. Uggowitzer
Received: 28 October 2014 / Accepted: 29 January 2015 / Published: 10 February 2015
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [1719 KB, uploaded 10 February 2015]   |  

Abstract

An Al2O3/5 vol%·ZrO2/5 vol%·Y3Al5O12 (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 ZrO2 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 Al2O3/ZrO2/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. View Full-Text
Keywords: Al2O3/ZrO2/YAG; elaboration; microstructure; high-temperature bending test; mechanical properties; thermal stability Al2O3/ZrO2/YAG; elaboration; microstructure; high-temperature bending test; mechanical properties; thermal stability
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Palmero, P.; Pulci, G.; Marra, F.; Valente, T.; Montanaro, L. Al2O3/ZrO2/Y3Al5O12 Composites: A High-Temperature Mechanical Characterization. Materials 2015, 8, 611-624.

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