Crystal phase control and ignition properties of HNS/CL-20 composite microspheres prepared by microfluidics combined with emulsification techniques--颗粒学报PARTICUOLOGY

Liu, Y., He, C., Wang, C., Chen, L., & Liu, S. (2024). Effects of vibration conditions, spatial confinement and friction on mixing and segregation characteristics of mixed pebble beds for CFETR WCCB blanket. Particuology, 85, 268-279. https://doi.org/10.1016/j.partic.2023.06.018

Crystal phase control and ignition properties of HNS/CL-20 composite microspheres prepared by microfluidics combined with emulsification techniques

Yi Liu a, Yunyan Guo ^a, Rui Zhu ^a, Jinqiang Zhou ^{a b}, Zhengxu Lin ^a, Kai Han ^a, Chongwei An ^{a c}, Jingyu Wang ^{a c}, Bidong Wu ^{a c *}

a School of Environment and Safety Engineering, North University of China, Taiyuan, 030051, China
b School of Engineering, Beijing Institute of Technology, Beijing, 100081, China
c Shanxi Province Ultrafine Powder Engineering Technology Research Center, Taiyuan, 030051, China

10.1016/j.partic.2023.06.008

Volume 85, February 2024, Pages 241-251

Received 8 May 2023, Revised 25 May 2023, Accepted 8 June 2023, Available online 26 June 2023, Version of Record 8 July 2023.

E-mail: wubidong@nuc.edu.cn

Highlights

• HNS/CL-20 microspheres were prepared by combining microfluidics and emulsification technology.

• The microspheres retained the crystal structure of CL-20 (ε-type).

• The microspheres have excellent ignition performance and detonation performance.

Abstract

Improved controllability and energy density of ignition agents are of great significance for the development of energetic composite materials. In this study, droplet microfluidics and emulsification techniques were combined to prepare HNS/CL-20 composite microspheres with polyglycidyl azide polymer (GAP) as the binder. The influence of binder content on the morphology of microspheres was investigated, and the microspheres were characterized and tested for particle size, crystal structure, thermal decomposition, dispersibility, mechanical sensitivity, combustion behavior and detonation performance. The results showed that microspheres prepared with a binder content of 3% had higher sphericity and particle size uniformity. The microspheres retained the crystal structure of both HNS and CL-20 (ε-type). Compared with raw HNS, the microspheres had higher apparent activation energy, better safety performance, and good dispersibility. The ignition experiments and detonation performance tests show that HNS/CL-20 composite microspheres have excellent ignition performance, obvious combustion flame, and significant energy release effects, which are expected to achieve high energy and high-speed response of the igniter, thus improving the ignition reliability in special environments or systems.

Graphical abstract

Keywords

Droplet microfluidics; Emulsification technology; Energetic materials; Composite microspheres; Crystal phase controlIgnition

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