Field assisted sintering of ceramic constituted by alumina and yttria stabilized zirconia |
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| Affiliation: | 1. Department of Industrial Engineering, University of Trento, 38123 Trento, Italy;2. Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0427, USA;1. Los Alamos National Laboratory, Los Alamos, NM 87544, USA;2. Technical University of Hamburg, Hamburg, Germany;1. National Institute for Materials Science, Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan;1. Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemical Engineering and Environmental, Beijing Institute of Technology, Beijing 100081, People''s Republic of China;2. Collaborative Innovation Center of Electric Vehicles in Beijing, No. 5 Zhongguancun South Avenue, Haidian District, Beijing 100081, People''s Republic of China;3. Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712, USA;1. Laboratoire d’Electrochimie et de Physicochimie des Matériaux et des Interfaces (LEPMI) – UMR 5631 CNRS-Université de Grenoble Alpes, BP 75, 38402 Saint Martin d’Hères, France;2. Laboratoire de Science et Ingénierie des Matériaux et Procédés (SIMaP) – UMR 5266 CNRS-Université de Grenoble Alpes, BP 46, 38402 Saint Martin d’Hères, France;1. Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38050 Trento, Italy;2. INSTM Research Unit, Via G. Giusti 9, 50121 Firenze, Italy |
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| Abstract: | We show that a two-phase 50 vol% 3YSZ-alumina ceramic flash-sinters at a furnace temperature of 1060 °C under an electrical field of 150 V cm−1. In contrast undoped, single-phase alumina remains immune to field assisted sintering at fields up to 1000 V cm−1, although single-phase 3YSZ flash sinters at 750 °C (furnace temperature). The mechanisms of field assisted sintering are divided into two regimes. At low fields the sintering rate increases gradually (FAST), while at high fields sintering occurs abruptly (FLASH). Interestingly, alumina/zirconia composites show a hybrid behavior such that early sintering occurs in FAST mode, which is then followed by flash-sintering. The specimens held in the flashed state, after they had sintered to near full density, show much higher rate of grain growth than in conventional experiments. These results are in contrast to earlier work where the rate of grain growth had been shown to be slower under weak electrical fields. |
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| Keywords: | Flash sintering FAST Hybrid sintering Grain growth |
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