Thermal Effect Study of Fluorographene/Boron Powder Composite Materials
X. Wen1, J.-H. Wang1, F.-W. Wang1, Y.-C. Liu1, J.-P. Wang1, N. Zhang2, Y.-W. Yu1
1School of Environmental and Safety Engineering, North University of China, Taiyuan, China
2Qingyang Chemical Industry Corporation, Liaoyang, China
Keywords: boron, oxide film, graphene fluoride, heat of combustion
Abstract
The problem of viscous oxide films, which prevent the full release of energy from boron powder during combustion, was overcome using graphene fluoride (fluorographene). This chemical compound was chosen due to its high fluorine content, low hydrogen content, low surface free energy, and strong thermal conductivity. Graphene fluoride reacts with boron, releasing a large amount of heat and gaseous products during combustion, effectively removing the viscous oxide film, and preventing boron agglomeration. Graphene fluoride was synthesized by shear cutting in an emulsifier, and graphene fluoride-boron composites were fabricated by solvent evaporation. Thermal analysis and heat of combustion tests showed that the prepared thin graphene fluoride layer had an average thickness of 1.56 nm. A composite of 20% graphene fluoride and boron showed a 1.86-fold increase in heat of combustion. Moreover, the addition of 20% graphene fluoride effectively improved the heat release during combustion of boron powder, making it comparable to the heat release during combustion of high-energy composites consisting of metal and boron powders.
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