Dense additive-free bulk boron nitride ceramics developed by self-densification of borazine |
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| Affiliation: | 1. Advanced Interdisciplinary Technology Research Center, National Innovation Institute of Defense Technology, Beijing 100010, China;2. Science and Technology on Advanced Ceramic fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China;3. School of Materials, Sun Yat-Sen University, Guangzhou 510275, China;1. School of Physics, Liaoning University, Shenyang 110036, PR China;2. Songshan Lake Materials Laboratory, Dongguan 523808, PR China;3. Dongguan University of Technology, Dongguan 523808, PR China;4. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China;5. School of Physics, Peking University, Beijing 100190, PR China;1. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, PR China;2. Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic, Shenzhen 518055, PR China;3. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, PR China;4. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China;5. School of Materials, Sun Yat-sen University, Guangzhou 510275, PR China;1. Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India;2. Department of Aerospace Engineering, Auburn University, Auburn, AL, USA;3. Material Science Division, National Aerospace Laboratories, Bangalore, India;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, PR China;2. State Key Laboratory of High Performance Ceramics and Super?ne Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR China;1. French-German Research Institute of Saint-Louis, Saint-Louis, France;2. ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France;3. IEM, CNRS, ENSCM, Univ Montpellier, Montpellier, France |
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| Abstract: | Boron nitride (BN) ceramics are promising candidates for high-temperature structural and functional materials. However, it is difficult to sinter dense additive-free bulk BN monoliths because of the covalent bond and flake structure. Here, we report dense bulk BN with relative density higher than 95% without sintering additives achieved via a self-densifying approach of borazine within a wide temperature range from 800 °C to 1800 °C. A polyborazylene with a controlled degree of cross-linking was synthesized and press-molded into shaped green bodies, which were pressureless pyrolyzed into porous frameworks and then densified through repeated borazine infiltration and pyrolysis method. The microstructural and crystalline evolution of the bulk BN ceramics, as well as the corresponded mechanical, thermal and dielectric properties were investigated. |
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| Keywords: | Additive-free boron nitride Borazine Microstructure Mechanical properties Dielectric properties |
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