Ceramics-Silikáty 56, (1) 15 - 19 (2012) |
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LOW-TEMPERATURE DEGRADATION (LTD) BEHAVIOUR OF CuO-DOPED TETRAGONAL ZIRCONIA CERAMIC
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Ramesh S. 1, Purbolaksono J. 1, Hamdi M. 1,
Sopyan I 2,
Tolouei R. 3,
Amiriyan M. 3,
Tarlochan F. 4,
Teng W. D. 5
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1 Centre of Advanced Manufacturing & Material Processing (AMMP), Department of Engineering Design
and Manufacture, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
2 Department of Manufacturing and Materials Engineering, Faculty of Engineering,
International Islamic University Malaysia (IIUM), 50728 Kuala Lumpur, Malaysia
3 Faculty of Science and Engineering, Laval University, Quebec, G1V 0A6 Canada
4 Ceramics Technology Laboratory, University Tenaga Nasional, 43009 Kajang, Selangor, Malaysia
5 Ceramics Technology Group, SIRIM Berhad, 1 Persiaran Dato Menteri, 40911 Shah Alam, Malaysia
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Keywords: Y-TZP, Zirconia, Low-Temperature Degradation, Corrosion, Phase Transformation
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In the present work, the low-temperature degradation (LTD) behavior of undoped and copper oxide (CuO) doped yttriatetragonal
zirconia polycrystals ceramics sintered at 1300oC was investigated. The zirconia samples were tested in three
different media i.e. superheated steam at 180oC/10 bar, refluxing conditions in 20% hydrochloric solution at 110oC and
in hot air at 180oC to determine the effect of hydroxyl content in triggering the tetragonal to monoclinic phase transformation.
The study found that the additions of CuO significantly reduced the rate of LTD phase transformation in all media tested.
The undoped zirconia exhibited severe LTD when exposed to media containing 100% hydroxyl content. Although the CuOdoped
samples were generally found to have better LTD characteristics, cross-sections of aged specimens (after 200 hours
of exposure in superheated steam) revealed that very thin measurable monoclinic layers were developed. The presence
of hydroxyl in the test media was found to have played a significant role in controlling the LTD of zirconia ceramics. |
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