Effect of pores on dielectric breakdown strength of alumina ceramics via surface and volume effects |
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| Affiliation: | 1. Department of Materials Science, Sichuan University, 610064, Chengdu, PR China;2. Institute of Engineering Electronics, China Academy of Engineering Physics, 621900, Mianyang, PR China;1. National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, College of Engineering and Applied Science & Jiangsu Key Laboratory of Artificial Functional Materials & Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, PR China;2. Department of Basic Courses, Jinling Institute of Technology, Nanjing, 211169, PR China;1. Xi''an University of Technology, Faculty of Printing, Packaging, and Digital Media Technology, Xi''an, 710048, Shaanxi, China;2. Xi''an Jiaotong University, Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi''an, 710049, Shaanxi, China;1. Southwestern Institute of Physics, Chengdu 610041, China;2. Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510650, China;1. Materials Engineering Department, Institute of Plasma Physics ASCR, v.v.i., Za Slovankou 3, Prague 8, Czech Republic;2. Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, Prague 6, Czech Republic;3. Center for Thermal Spray Research, Department of Materials Science & Engineering, Stony Brook University, Stony Brook, NY 11794-2275, USA |
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| Abstract: | To investigate the effect of pores on the dielectric breakdown (DB) of alumina ceramics under AC voltage, we implant pores at different positions (surface, interior, and the whole body) of the ceramic samples by adding the polyvinyl alcohol solid particles at different positions in the green bodies. Meanwhile, two electrode setups are used to test the dielectric breakdown strength (DBS), in order to analyze the effect of pore distribution on the DB, and the morphology of the DB channels is characterized. The results reveal both the pores on the surface and in the bulk reduce the DBS, and the pore distribution affects the shape and position of the DB channel. Besides, pre-breakdown in a low-DBS layer is found when the voltage is not high enough to produce DB. It confirms that the effect of pores on the DB is a combination of the volume effect and the surface effect. |
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| Keywords: | Pores Surface effect Volume effect Dielectric breakdown |
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