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RISS 인기검색어
- 검색키워드
- 저자 : A. Rittidech (검색결과 2 건)
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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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A. Sutthapintu,A. Rittidech 한국자기학회 2020 Journal of Magnetics Vol.25 No.2
The effect of two-stage sintering of composition ceramics between (0.6)Mg0.7Zn0.3Fe2O4 and (0.4)Ba0.7Sr0.3TiO3 on crystal structure, microstructure, electrical and magnetic properties was studied. Samples were sintered using a two-stage sintering method with the first sintering temperature (T1) at 1350 ºC with different holding times for 30, 50 and 60 min and cooled down to the second sintering temperature (T2) with sintering temperatures at 900 °C and 1100 oC for 5 h with heating/cooling rate at 10 ºC/min. It was found that the densities and shrinkage values tended to slightly increase with the length of holding times at T1. XRD patterns showed a combination phase between Mg0.7Zn0.3Fe2O4 and Ba0.7Sr0.3TiO3. The crystallize size and lattice strain were calculated from XRD patterns and found to increase with T2 sintering. EDX analysis was used to confirm the elemental composition percentage of (0.6)MZF-(0.4)BST. Examination of the microstructure of composition ceramics with SEM revealed grain sizes in the range of 0.852-1.877 μm; with, square shaped grains corresponding to the Mg0.7Zn0.3Fe2O4 phase and round oval shape corresponding with Ba0.7Sr0.3TiO3 phase. Magnetic behavior and dielectric constant are obviously increased with highly dense ceramics. Finally, the optimal conditions of two stage sintering were obtained for the holding times of T1 about 50-60 min and the second sintering temperature of T2 at 900 °C for 5 h.
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