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Mechanical properties and low-temperature aging of tetragonal zirconia polycrystals processed by hot isostatic pressing

Published online by Cambridge University Press:  03 March 2011

J. Muñoz-Saldaña
Affiliation:
Technical University Hamburg-Harburg, Advanced Ceramics Group, D-21073, Hamburg, Germany
H. Balmori-Ramírez
Affiliation:
Technical University Hamburg-Harburg, Advanced Ceramics Group, D-21073, Hamburg, Germany
D. Jaramillo-Vigueras
Affiliation:
Department of Metallurgical Engineering, Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE), Instituto Politécnico Nacional, A.P. 75–872, Mexico City 07300, Mexico
T. Iga
Affiliation:
Ceramic Science Department, National Industrial Research Institute of Nagoya, Nagoya 462, Japan
G. A. Schneider
Affiliation:
Technical University Hamburg-Harburg, Advanced Ceramics Group, D-21073, Hamburg, Germany
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Abstract

The influence of grain size and density of yttria-tetragonal zirconia polycrystals (Y-TZPs) ceramics on mechanical properties and on low-temperature aging degradation (LTD) in air and in hot water was investigated. A TZP powder containing 3 mol% Y2O3 was consolidated by slip casting and densified by the sintering/hot isostatic pressing (HIP) method. Only the presintered samples that contained less than 0.15% open porosity reached near full density after HIP. The best conditions to reach full density were found to be attained by presintering and HIP both at 1400 °C. At these conditions, some of the best mechanical properties such as modulus of rupture and Weibull modulus reached 1397 ± 153 MPa and, 10.6, respectively. These values were clearly higher than those obtained from sintered bodies and samples hot isostatically pressed at 1600 °C. Aging degradation of 3Y-TZP materials can be avoided through microstructural design. Fully dense materials with a critical grain size <0.36 μm did not show any evidence of degradation after extreme aging conditions at pressurized autoclaving in hot water at 100, 200, and 260 °C for 8 h. We propose a criterion to predict degradation in air as well as in hot water for the characterized materials based on the microstructure and density control of the samples.

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Articles
Copyright
Copyright © Materials Research Society 2003

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