The Influence of Manganese Oxide on the Densification and Mechanical Properties of 3Y-TZP Ceramics

Main Article Content

Ming Ling Ting
Kong Leong Chin
Heng Kiat Jun
Chen Hunt Ting
Chui Kim Ng
Singh Ramesh

Abstract

With outstanding integration of mechanical performances and biocompatibility, 3 mol% of yttria stabilised tetragonal zirconia polycrystals (3Y-TZP) ceramic are extensively fabricated as biomedical implants. Conventional sintering (CS) was generally employed to produce 3Y-TZP bodies with promising densification, which resulted in grain coarsening and mechanical properties deterioration due to elevated sintering temperatures (> 1500°C). The main weakness of 3Y-TZP ceramic is the spontaneous tetragonal to monoclinic phase transformation under humid environment, which is known as low-temperature degradation (LTD). In present work, undoped and MnO2 (0.3 and 0.5 wt%) doped 3Y-TZP green bodies were prepared and subjected to CS at 1200–1500°C for an hour of dwelling time. It was found that the optimum concentration of MnO2 dopant was 0.5 wt%. Reasonable toughness values of 5–7 MPa.m1/2 revealed the tetragonal phase stability of 3Y-TZP grains was not altered by doping of MnO2. Moreover, outstanding density level of > 96% of 0.5 wt% MnO2 doped 3Y-TZP ceramics demonstrated the superb Young’s modulus of > 200 GPa and Vicker’s hardness of >13 GPa. Fabrication of 3Y-TZP by doping MnO2 had reduced the total processing time by ~ 9% and sintering temperature by up to 150°C when compared to undoped 3Y-TZP ceramics sintered at 1400°C.

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How to Cite
Ting, M. L., Chin, K. L., Jun, H. K., Ting, C. H., Ng, C. K., & Ramesh, S. (2020). The Influence of Manganese Oxide on the Densification and Mechanical Properties of 3Y-TZP Ceramics. Applied Science and Engineering Progress, 13(3), 268–273. Retrieved from https://ph02.tci-thaijo.org/index.php/ijast/article/view/241546
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Research Articles

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