The effect of sintering time on 8 Mol% Yttria Stabilized Zirconia (8YSZ) ceramic

Abstract

Sinterability of granulated and milled 8mol% Yttria Stabilized Zirconia (8YSZ) ceramics was investigated in this present research. Samples milled and granulated 8YSZ were compacted by using uniaxial pressing at 370 MPa in 12 mm diameter mould. All samples were sintered at temperature 1550 ⁰C and hold at different holding time of 4 hours, 5 hours, 6 hours, and 7 hours. Crystal structure analysis of the XRD data was characterized by using Expert High Score Plus with the help of ICSD database. We found that there were three phases present in all tested samples which are cubic, tetragonal, and monoclinic. The percentage of cubic phase was almost part of the sample followed by tetragonal and the lowest was monoclinic phase. Furthermore, the densification was measured by Archimedes principles and we found that milled 8YSZ has the highest densification of >98% sintered for 5 hours holding temperature. In contrast, granulated 8YSZ only achieved low density <62% Plus, the results of densification obtained were supported by observing the morphology of tested samples by Scanning Electron Microscopy (SEM). Lastly, ionic conductivity of sintered milled 8YSZ samples were found higher than granulated 8YSZ samples which measured by using Impedance Spectroscopy (IS).