Synthesis of h-BN by the Combustion of B/KNO3/Octogen Mixture under Nitrogen Atmosphere

Hexagonal boron nitride (h-BN) powders were fabricated by the combustion synthesis with B/KNO3/HMX (octogen) mixtures as reactants. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were adopted to investigate the phase composition and the chemical composition of the products, respe...

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Bibliographic Details
Published in:Journal of chemistry 2019-01, Vol.2019 (2019), p.1-6
Main Authors: Hu, Song-qi, Liu, Lin-lin, Wang, Yin
Format: Article
Language:English
Subjects:
Boron
Boron carbide
Boron nitride
Boron oxides
Ceramics
Chemical composition
Chemical vapor deposition
Combustion synthesis
Dielectric properties
Grain size
Heat
HMX
Mechanical properties
Morphology
Nitrogen
Organic chemistry
Oxidation resistance
Phase composition
Photoelectrons
Potassium
Purity
Raw materials
Scanning electron microscopy
Thermogravimetry
Thin films
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:Hexagonal boron nitride (h-BN) powders were fabricated by the combustion synthesis with B/KNO3/HMX (octogen) mixtures as reactants. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were adopted to investigate the phase composition and the chemical composition of the products, respectively. The morphology and resistance to oxidation were studied by scanning electron microscopy (SEM) and thermogravimetry (TGA), respectively. The characterization results showed that the h-BN which was produced through this method has high purity and exhibits excellent resistance to oxidation. The purity of h-BN is improved with the increasing content of HMX in reactants with boron carbide (B4C) and boron oxide (B2O3) as main impurity, but conversely, the yields are obviously decreased. Taking the comprehensive consideration of the purity and the yields together, the optimal molar ratio of B/KNO3/HMX is 10 : 1 : 4. In addition, the experimental results indicated that the crystalline grain size grows with the increasing content of HMX. The method explored in this study does not need expensive processing facilities and equipment, which is a preferable approach for the laboratory to prepare h-BN of high purity.
ISSN:2090-9063
2090-9071
DOI:10.1155/2019/8793282