期刊
APPLIED SURFACE SCIENCE
卷 258, 期 22, 页码 8455-8459出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2012.03.107
关键词
Pyrolytic carbon; Boron nitride; Oxidation resistance; Microwave absorbing properties
类别
资金
- State Key Development Program for Basic Research of China [2011CB605804]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2011B114]
- Graduate degree thesis Innovation Foundation of Central South University [1960-71131110011]
Boron nitride coatings were synthesized on pyrolytic carbon (BN-coated PyC) particles via chemical reaction of boric acid and urea in nitrogen. The results of Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FI-IR) and X-ray photoelectron spectroscopy (XPS) show the formation of boron nitride coating. The TGA curves indicate that the oxidation resistance of the PyC particles is improved by incorporating BN coating on the surface. The mass of the BN-coated PyC particles remains over 60% at 1200 degrees C whereas the PyC particles are oxidized completely at 920 degrees C. The investigation of microwave absorbing property reveals that compared with the PyC particles, the BN-coated PyC particles have lower permittivity (epsilon', epsilon '') and better absorbing property. The BN-coated PyC particles show a strong absorbing peak at 10.64 GHz, where the lowest reflectivity -21.72 dB is reached. And the reflectivity less than -10 dB is over the range of 9.6-12 GHz. (C) 2012 Elsevier B. V. All rights reserved.
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