ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 57, (1) 28 - 32 (2013)

Ramesh S. 1, Kelvin Chew W. J. 1, Tan C. Y. 1, Purbolaksono J. 1, Noor A. M. 1, Hassan M. A. 1, Suntharsini U. 1, Satgunam M. 2, Teng W. D. 3,
1 Centre of Advanced Manufacturing & Material Processing (AMMP), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
2 University of Tenaga National, Putrajaya, 43009, Malaysia
3 Ceramics Technology Group, SIRIM Berhad, 40911 Shah Alam Selangor, Malaysia

Keywords: Y-TZP, Zirconia, Manganese Oxide, Mechanical Properties

The influence of small additions of MnO2 (up to 1 wt. %) on the sintering behaviour of yttria-stabilized zirconia sintered over the temperature range from 1250oC to 1500oC was investigated. It was found that the mechanical properties of Y-TZP were dependent on the dopant amount and sintering temperature. The results revealed that relative densities above 97.5 % of theoretical (i.e. > 5.95 Mg m-3) could be obtained in Y-TZPs sintered at low temperatures, 1250oC and 1300oC, with the additions of ≥ 0.3 wt. % MnO2. In comparison to the undoped samples, the additions of up to 1 wt. % MnO2 and for sintering up to 1350oC was found to be beneficial in enhancing the Vickers hardness of the ceramic. The fracture toughness of Y-TZP however, was found to increase only in the 1 wt. % MnO2-doped samples when sintered above 1400oC. The relation between the measured mechanical properties is discussed with the emphasis on the role of the manganese oxide.

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