Conversion from β-Ce2O3·11Al2O3 to α-Al2O3 in Tetragonal ZrO2 Matrix |
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Authors: | Koji Tsukuma |
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Affiliation: | Industry Technology Department, New Energy and Industry Technology Development Organization (NEDO), Tokyo, Japan 170–6028 |
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Abstract: | Composites of β-Ce2O3·11Al2O3 and tetragonal ZrO2 were fabricated by a reductive atmosphere sintering of mixed powders of CeO2, ZrO2 (2 mol% Y2O3), and Al2O3. The composites had microstructures composed of elongated grains of β-Ce2O3·11Al2O3 in a Y-TZP matrix. The β-Ce2O3·11Al2O3 decomposed to α-Al2O3 and CeO2 by annealing at 1500°C for 1 h in oxygen. The elongated single grain of β-Ce2O3·11Al2O3 divided into several grains of α-Al2O3 and ZrO2 doped with Y2O3 and CeO2. High-temperature bending strength of the oxygen-annealed α-Al2O3 composite was comparable to the β-Ce2O3·11Al2O3 composite before annealing. |
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Keywords: | microstructure sinter/sintering zirconia tetragonal polycrystals |
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