Journal
MATERIALS & DESIGN
Volume 54, Issue -, Pages 610-615Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.08.089
Keywords
Borazine; Boron nitride; Bulk foam; High-temperature radome; Thermal insulation
Categories
Funding
- National Natural Science Foundation of China [90916019]
- aid program for Science and Technology Innovation Research Team in Higher Educational Institutions of Hunan Province
- National University of Defense Technology in China
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Boron nitride (BN) ceramic bulk foams larger than 10 x 10 x 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 H-2 in condensation polymerization during the curing of borazine. The as-fabricated BN ceramic foams exhibit closed cells with sizes ranging from 50 to 100 mu m 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. (C) 2013 Elsevier Ltd. All rights reserved.
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