Role of binders in reactive composites: A case study with spherical B/Pb3O4 particles--颗粒学报PARTICUOLOGY

Wang, F., Du, S., Yang, J., Xue, Z., Li, J., An, C., . . . Wu, B. (2024). Role of binders in reactive composites: A case study with spherical B/Pb3O4 particles. Particuology, 93, 170-179. https://doi.org/10.1016/j.partic.2024.06.011

Role of binders in reactive composites: A case study with spherical B/Pb₃O₄ particles

Fan Wang, Shanghao Du, Jiahui Yang, Zhihua Xue, Jiafei Li, Chongwei An, Jingyu Wang, Bidong Wu^*

School of Environment and Safety Engineering, North University of China, Taiyuan, 030051, China

10.1016/j.partic.2024.06.011

Volume 93, October 2024, Pages 170-179

Received 9 May 2024, Revised 25 June 2024, Accepted 25 June 2024, Available online 2 July 2024, Version of Record 6 July 2024.

E-mail: wubidong@nuc.edu.cn

Highlights

• Method to prepare reactive composite microspheres with micrometer-scale powder, showing broad application potential.

• Reactivity of composite particles is influenced by changes in binder content and resulting particle state variations.

• Droplet microfluidic technology enhances particle properties, safety, and combustion performance of reactive composites.

• Insights into binder roles in spherical reactive composites serve as a reference for other composite particles.

Abstract

The strategic selection of appropriate preparation methods and binder strategies is crucial for enhancing the particle and combustion performance of pyrotechnic delay compositions (PDCs). This study, utilizing droplet microfluidics technology (DMT) and micron-scale raw materials, prepared spherical B/Pb₃O₄ composite particles with varying concentrations of fluorine rubber (F₂₆₀₄). The morphology, specific surface area, bulk density, flowability, friction sensitivity, thermal decomposition, and combustion performance of these microspheres were characterized. The results indicate that as the binder content increases, the particle size of the microspheres first decreases and then increases, the specific surface area decreases, and the bulk density increases, correlating with tighter binding of the reactant powders by the binder. Furthermore, tighter powder-to-powder binding results in a progressive decrease in the thermal decomposition peak temperature of the samples (from 404.2 °C to 346.4 °C). Additionally, increased binder content reduces the friction sensitivity and combustion rate of the samples, which is attributed to the energy absorption properties of the binder. Compared to the control group, the microsphere samples exhibit significantly enhanced bulk density, flowability, friction safety, and combustion delay precision, potentially improving the reliability of PDCs in ignition sequences.

Graphical abstract

Keywords

Pyrotechnic delay composition; Droplet microfluidic technology; Particle; Binder; B/Pb₃O₄; Combustion performance

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