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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 ,
H. Balmori-Ramírez ,
D. Jaramillo-Vigueras ,
T. Iga  and
G. A. Schneider
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.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 10 , October 2003 , pp. 2415 - 2426
Copyright
Copyright © Materials Research Society 2003

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