Preparation and characterization of high-reactivity explosive-based nano-boron microspheres--颗粒学报PARTICUOLOGY

Dong, C., Wang, Y., Jia, K., Song, D., Song, X., & An, C. (2024). Preparation and characterization of high-reactivity explosive-based nano-boron microspheres. Particuology, 93, 125-136. https://doi.org/10.1016/j.partic.2024.06.009

Preparation and characterization of high-reactivity explosive-based nano-boron microspheres

Chen Dong^a, Yi Wang^a *, Kanghui Jia^b *, Dan Song^c, Xiaolan Song^d, Chongwei An^d

a School of Materials Science and Engineering, North University of China, Taiyuan, 030051, China
b Jinxi Group Shanxi Jiangyang Chemical Co., Ltd., Taiyuan, 030051, China
c China Ordnance Institute of Science and Technology, Beijing, 100089, China
d School of Environment and Safety Engineering, North University of China, Taiyuan, 030051, China

10.1016/j.partic.2024.06.009

Volume 93, October 2024, Pages 125-136

Received 21 March 2024, Revised 12 June 2024, Accepted 12 June 2024, Available online 27 June 2024, Version of Record 3 July 2024.

E-mail: wangyi528528@nuc.edu.cn; j19834405464@163.com

Highlights

• Microspheres of nB/F₂₆₀₂/CL-20(PETN) exhibit high sphericity and strong antioxidative capability.

• Microspheres are more reactive than raw nanoboron powder and physically mixed samples.

• Closely combining nanoboron powder with high-energy explosives effectively enhances its combustion performance.

Abstract

Boron nanoparticles, with their remarkably high gravimetric and volumetric calorific values, emerge as the most promising fuel in energetic fields. However, challenges such as susceptibility to oxidation, high ignition temperature, and low combustion efficiency have constrained their further applications. In this study, we fabricated high explosives based nano-boron microspheres with uniform size using the electrostatic spray method, in which the boron nanoparticles and high explosives (CL-20 or PETN) are closely bonded together by fluorinated polymer (F₂₆₀₂) and evenly distributed. The results indicated that the microspheres exhibited high sphericity and showed an enhanced antioxidant capability. The addition of high-energy explosives not only reduced the thermal oxidation temperature of nano-boron powder within the microspheres but also significantly enhanced the pressurization rate. Additionally, the microspheres with added high-energy explosives released more energy during the combustion process. Compared to physically mixed samples, electrostatically sprayed microspheres with a uniform microstructure still exhibited higher reactivity. Therefore, the design and synthesis of microspheres with controllable structures using the electrostatic spray method show promising application prospects.

Graphical abstract

Keywords

Nano-boron; CL-20; PETN; Electrospraying; Ignition and combustion

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