Preparation and Characterization of Fine-Grained 3Y-TZP/BaFe12O19 In Situ Composites |
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Authors: | Yoshikazu Suzuki Masanobu Awano Naoki Kondo Tatsuki Ohji |
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Affiliation: | National Industrial Research Institute of Nagoya, Nagoya 462–8510, Japan |
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Abstract: | Composites of BaFe12O19 particles dispersed throughout a 3-mol%-yttria-doped zirconia (3Y-TZP) matrix have been prepared using the pressureless reactive sintering of 3Y-TZP, BaCO3, and γ-Fe2O3 powders. The reaction behavior of the mixed powder was studied with an in situ , high-temperature powder X-ray diffraction technique. The composite that was sintered at 1300°C consisted of submicrometer-sized 3Y-TZP grains and BaFe12O19 particles; the size of the 3Y-TZP grains was ~100-300 nm, and the size of the BaFe12O19 particles was ~200-500 nm. Based on the grain size, most of the BaFe12O19 grains presumably had a single-magnetic-domain structure. The 3Y-TZP/20-wt%-BaFe12O19 composite showed high magnetization and coercivity values, despite the low concentration of ferromagnetic phase. Preliminary mechanical tests revealed that the composite possessed moderately good mechanical properties. |
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