Two-step hot pressing of bimodal micron/nano-ZrB2 ceramic with improved mechanical properties and thermal shock resistance |
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| Affiliation: | 1. State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, PR China;2. Department of Mechanics, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China;1. Department of physics, N.M.S.S.V.N College, Madurai, Tamilnadu 625019, India;2. Department of Physics, E.M.G. Yadava Women''s College, Madurai, Tamilnadu 625 014, India;3. Department of Physics and Nanotechnology, SRM University, Chennai, Tamilnadu 603203, India;1. Technological Institute for Superhard and Novel Carbon Materials, Centralnaya str. 7a, Troitsk 142190, Moscow, Russian Federation;2. International Laser Center, Lomonosov Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation;3. Moscow Institute of Physics and Technology State University, Institutskiy per. 9, Dolgoprudny 141700, Moscow, Russian Federation;1. NRC-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel;2. Electrical Discharge and Plasma Laboratory, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, Israel;3. Department of Materials Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel;4. Advanced Coatings Center, Rotem Industries Ltd., Mishor Yamin, D.N. Arava 86800, Israel;1. School of Materials Science and Engineering, Sichuan University, Chengdu 610065, People''s Republic of China;2. Key Laboratory of Advanced Special Material and Technology, Ministry of Education, Chengdu 610065, People''s Republic of China |
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| Abstract: | The densification and grain growth behaviors for micron- and nano-sized ZrB2 particles were investigated. The densification on-set temperature (Td-micron) and grain growth on-set temperature (Tg-micron) for micron-sized ZrB2 particles were about 1500 °C and 1800 °C, respectively. And the densification on-set temperature (Td-nano) and grain growth on-set temperature (Tg-nano) for nano-sized ZrB2 particles were about 1300 °C and 1500 °C, respectively. A bimodal micron/nano-ZrB2 ceramic was therefore prepared using a novel two-step hot pressing. A high relative density of 99.2%, an improved flexural strength of 580.2 ± 35.8 MPa and an improved fracture toughness of 7.2 ± 0.4 MPa·m1/2 were obtained. The measured critical thermal shock temperature difference (ΔTc) for this bimodal micron/nano-ZrB2 ceramic was as high as 433 °C. |
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