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Preparation and characterization of zirconia ceramics with oxides addition
A. Rittidech,S. Wantrong,S. Chommi 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.2
This research investigated the relationship between the quantitative phase crystal structure and mechanical properties of ZrO2ceramic addition of Y2O3, MgO and BaCO3 at 0.0, 2.0, 4.0 and 6.0 mol%. Ceramic samples were prepared using mixed oxidemethod under normal sintering at 1,600 oC with dwell time for 120 min . ZrO2-Y2O3 and ZrO2-MgO ceramics were obtainedwith bulk densities values between 5.324-5.722 g/cm3 while ZrO2-BaCO3 ceramic showed densification values about 4.412-4.827 g/cm3. It was found that ZrO2-Y2O3 and ZrO2-MgO ceramic showed higher fracture toughness values than ZrO2-BaCO3ceramics. Refinement of lattice parameter using Rietveld analysis in ceramic samples revealed the percentage of fraction phaseratios of m-ZrO2, t-ZrO2 and c-ZrO2. The refinement parameters result in sample ceramic which are Y2O3 addition between4-6 mol% obtained a high ratio of t-ZrO2 phase and the result supported optimal mechanical properties. ZrO2-Y2O3 ceramicshowed a higher lattice stain value compared with the additions of other ZrO2 oxides and it was found that lattice strainincrease with high ratio of t-ZrO2 phase. Sample ceramics had crystallite size values between 56.65-82.30 nm. SEMmicrographs revealed morphology and average grain sizes. All samples grains were spherical in shape combined with irregularshape and were gray in color and were obtained with an average grain size between 0.63 -2.18 μm. It was found that the ZrO2-Y2O3 ceramic showed small crystallize size and size of grains. The optimal condition for addition of oxide were found inceramics of ZrO2-Y2O3 and ZrO2-MgO and confirmed that good mechanical properties were obtained from a high ratio of t-ZrO2 phase and fine grain size.
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