INFLUENCE OF MANGANESE ON THE SINTERING PROPERTIES OF TETRAGONAL ZIRCONIA

The influence of small additions of MnO2 (up to 1 wt%) on the sintering behaviour of yttria-stabilised zirconia (Y-TZP) sintered over the temperature range from 1250 to 1500 C was investigated. It was found that the mechanical properties of Y-TZP were dependent on the dopant content and sintering te...

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Bibliographic Details
Published in:Ceramics (Praha) 2013-01, Vol.57 (1), p.28-32
Main Authors: Ramesh, S, Kelvin, Chew W J, Tan, C Y, Purbolaksono, J, Noor, A M, Hassan, M A, Sutharsini, U, Satgunam, M, Teng, W D
Format: Article
Language:English
Subjects:
Ceramics
Density
Manganese Oxide
Manganese oxides
Mechanical Properties
Sintering
Tetragonal zirconia polycrystals
Vickers hardness
Y-TZP
Yttria stabilized zirconia
Zirconia
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Summary:The influence of small additions of MnO2 (up to 1 wt%) on the sintering behaviour of yttria-stabilised zirconia (Y-TZP) sintered over the temperature range from 1250 to 1500 C was investigated. It was found that the mechanical properties of Y-TZP were dependent on the dopant content and sintering temperature. The results revealed that relative densities > 97.5% of theoretical (i.e. > 5.95 Mg/m3) could be obtained in Y-TZPs sintered at low temperatures, 1250 C and 1300 C, with the additions of at least 0.3 wt% MnO2. In comparison to the undoped samples, additions of up to 1 wt% MnO2 and sintering up to 1350 C were found to be beneficial in enhancing the Vickers hardness of the ceramic. The fracture toughness of Y-TZP however increased only in the 1 wt% MnO2-doped samples when sintered > 1400 C. The relation between the measured mechanical properties is discussed with the emphasis on the role of manganese oxide.
ISSN:0862-5468
1804-5847