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Enhanced thermal- and impact-initiated reactions of PTFE/Al energetic materials through ultrasonic-assisted core-shell construction
- Source :
- Defence Technology, Vol 18, Iss 8, Pp 1362-1368 (2022)
- Publication Year :
- 2022
- Publisher :
- KeAi Communications Co., Ltd., 2022.
-
Abstract
- A facile and economical approach was developed for the large-scale production of powdered core-shell structured PTFE/Al (CS-PA) energetic materials through ultrasonic-assisted mixing. The low-cost micrometer-sized PTFE and Al particles were used as starting materials. Under high-power ultrasonic waves, the PTFE powder was dispersed into nano-to sub-micrometer-sized particles and then encapsulated the Al microparticles to form the core-shell structure. The heat of combustion, burning rate, and pressurization rate of the powdered CS-PA were measured. The thermal-initiated reaction behavior was further evaluated using thermogravimetry-differential scanning calorimetry. Subsequently, the bulk CS-PA with a uniform microstructure was obtained via cold isostatic pressing of the powdered CS-PA followed by vacuum sintering. For the bulk CS-PA, the quasi-static compression behavior was characterized, and the impact-initiated reaction processes were conducted using the Split Hopkinson Pressure Bar (SHPB) and evaluated by a high-speed camera. Compared to physically mixed PTFE/Al materials, the powdered and bulk CS-PA demonstrated enhanced thermal- and impact-initiated reaction characteristics respectively, proving the effectiveness of our approach for constructing core-shell structures.
Details
- Language :
- English
- ISSN :
- 22149147
- Volume :
- 18
- Issue :
- 8
- Database :
- Directory of Open Access Journals
- Journal :
- Defence Technology
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.6878087172a643efa77a5f7a2b37c935
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.dt.2021.08.003