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Fabrication and characterization of boron nitride bulk foam from borazine
Affiliation:1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei 430081, PR China;2. The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology, Wuhan, Hubei 430081, PR China;1. Department of Materials Science, Materials Engineering Research Center (CRIM), University of Mons, Place du Parc 20, B-7000 Mons, Belgium;2. Laboratory of Polymeric and Composite Materials, Center of Innovation and Research in Materials and Polymers (CIRMAP), Materia Nova Research Center & University of Mons, Place du Parc 20, B-7000 Mons, Belgium;3. Materia Nova Asbl, Avenue Copernic 1, B-7000 Mons, Belgium;4. School of Chemistry, Cardiff University, Park Place Main Building, Cardiff CF10 3AT, United Kingdom;5. Université Catholique de Louvain, Institute of Condensed Matter and Nanoscience, 1 Place Louis Pasteur, B-1348 Louvain-la-Neuve, Belgium;1. University of Greenwich, Medway Campus, Chatham, ME4 4TB, UK;2. School of Chemistry and EaStCHEM Research School, University of Edinburgh, The King''s Buildings, West Mains Road, Edinburgh, EH9 3JJ, UK;3. Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ, UK;4. Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK;1. Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia;2. Beijing Computational Science Research Center, Beijing 100084, PR China;3. China Iron & Steel Research Institute Group, Advanced Technology & Materials Co., Ltd., No.76 Xueyuan Nanlu, Haidian, Beijing 100081, PR China;4. School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia;5. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, PR China;6. College of Science, Shenyang University, Shenyang 110044, PR China;1. Molecular Biology Laboratory – Post Graduate Program of Amazon Parasitic Biology, Biological and Health Sciences Center, State University of Pará, Belém, Pará, Brazil;2. Human Cytogenetics Laboratory, Institute of Biological Sciences, Federal University of Pará, Belém, Pará, Brazil;3. Department of Clinical Dentistry – Health Sciences Center, Federal University of Ceará, Fortaleza, Ceará, Brazil
Abstract:Boron nitride (BN) ceramic bulk foams larger than 10 × 10 × 1 cm are fabricated by the pyrolysis of polyborazine foams that are prepared by fast curing of borazine. The principle of the self-foaming phenomenon is the emitting of H2 in condensation polymerization during the curing of borazine. The as-fabricated BN ceramic foams exhibit closed cells with sizes ranging from 50 to 100 μm and controlled bulk densities varying from 0.08 to 0.25 g cm−3 depending on the different cured pressures. Studies on the microstructure and properties of the porous material show that the BN ceramic foams exhibit high specific strength, low dielectric constants and loss tangents, and good thermal conductivity. These characteristics make them useful for high temperature radomes and thermal insulation.
Keywords:Borazine  Boron nitride  Bulk foam  High-temperature radome  Thermal insulation
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