Suppression of nitridation of yttria-doped zirconia during flash sintering |
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| Authors: | Tsuyoshi Kurachi Yudai Yamashita Tomoharu Tokunaga Hidehiro Yoshida Takahisa Yamamoto |
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| Affiliation: | 1. Department of Materials Design Innovation Engineering, Nagoya University, Nagoya, Japan;2. Department of Materials Science, The University of Tokyo, Tokyo, Japan |
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| Abstract: | The effect of direct current (DC) and alternating current (AC) on nitridation of 3 mol% Y2O3-doped ZrO2 (3YSZ) after keeping in a flash state for 1 hour was investigated. The inside of the DC-flashed compact was confirmed to exhibit blacking. Scanning transmission electron microscopy, electron energy loss spectroscopy, and X-ray diffraction analysis revealed that zirconium nitrides formed in the blackened area. In contrast, a uniformly densified compact without blackening was obtained by AC fields. No zirconium nitrides formed in the compacts exposed to AC fields even when the flash state was maintained for 1 hour. Therefore, AC fields are effective to suppress nitridation of 3YSZ during flash sintering. |
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| Keywords: | electric field flash sintering nitriding sintering zirconia |
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