Microcrack healing in zirconia ceramics under a DC electric field/current |
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| Affiliation: | 1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Chiba Institute of Technology, 2-17-1 Tsudanuma,Narashino, Chiba 275-0016, Japan;1. Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan;2. Research Center for Structural Materials, National Institute for Materials Science (NIMS), Ibaraki, 305-0047, Japan;3. Institute of Energy and Climate Research, IEK-1: Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany;1. School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA;2. Institute of Applied Materials – Ceramic Materials and Technologies (IAM-KWT), Karlsruhe Institute of Technology (KIT), 76131, Karlsruhe, Germany;3. Robert Bosch GmbH, Department of Corporate Research, Stuttgart, Germany;4. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA;1. Department of Materials Science and Engineering (Glass and Ceramics), Friedrich-Alexander-Universität Erlangen-Nuernberg, Martensstr. 5, 91058 Erlangen, Germany;2. Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;1. Department of Materials Science, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Department of Materials Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan;3. National Institute for Material Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Department of Materials Design Innovation Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan;1. Department of Materials Design Innovation Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 4648601, Japan;2. Department of Materials Science, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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| Abstract: | Flash event caused by a DC electric field/current was applied to the crack healing in 8 mol % Y2O3 stabilized cubic ZrO2 polycrystals (8Y-CSZ). The flash event, which occurred by applying the DC power higher than a critical value of 100 mW/mm3, successfully healed the microcrack within several minutes without any healing agents at a furnace temperature of 800 °C. As compared to the healing treatment under static annealing, the healing phenomena were accelerated about 2 times under the flash treatment even at the same temperatures, suggesting that the enhanced healing phenomena cannot be explained only by the temperature effect. Since the rate of grain growth was accelerated under the flash treatment, the flash healing would be accelerated through the current-enhanced diffusional processes. This study shows for the first time that the flash event has a potential to apply to the crack healing process in the ceramic materials and composites. |
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| Keywords: | Healing Microcrack Electric current Flash Zirconia |
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