Investigation of the Elastic Properties of Dense Ceramics of the Binary System Al2O3-ZrO2 after Thermal Shocks

Pierluigi Piccolo1, Nicolas Traon2, Thorsten Tonnesen2, Rainer Telle2, Gabriela Diniz Franca3

1 Federal University of Rio de Janeiro, Rio de Janeiro (RJ) 21941-901/Brazil
2 GHI/RWTH-Aachen, Institute of Mineral Engineering, Department of Ceramics and Refractory Materials, 52064 Aachen/Germany
3 Pontificia Universidade Catolica de Minas Gerais, Belo Horizonte (MG) 31270-901/Brazil

Revision 28.05.2015, 08.06.2015

Volume 7, Issue 3, Pages 119 - 126

Abstract

The work herein correlates elastic properties and microstructural characterization of dense ceramic materials elaborated by slip casting before and after thermal shocks in water. A total of eleven formulations of the binary system Al2O3–ZrO2 are studied. Therefore a partially stabilised zirconia doped with 3 mol.-% of yttria with a limited quantity of monoclinic phase is used to avoid undesirable microstructure damaging during the sintering of the ceramic samples at 1550 °C/3h. The quenching cycles in water are progressively performed according to DIN 51068 at 400 °C to examine the lonely influence of the crack initiation on the microstructural and elastic properties of the samples. Young’s modulus, damping properties of the flexural resonant frequency and the non-linearity of the flexural resonant frequency are determined through Resonant Frequency Damping Analysis via the Impulse Excitation Technique at room temperature after each thermal shock cycle according to ASTM C 1548-02. Scanning Electron Microscopy (SEM) completes this survey in order to understand the elastic property changes of these ceramic pieces after damaging in regard to their microstructural changes. This study aims to gather fundamental knowledge with regard to internal friction phenomena in the binary system Al2O3–ZrO2. Indeed such a data acquisition leads to a better understanding of the evolution of the elastic properties of typical high alumina refractory formulations with addition of partially stabilised zirconia.

Keywords

thermal shock, impulse excitation technique, partially stabilised zirconia, Young’s modulus, damping, non-linearity

References

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