Combustion and radiation properties of pyrotechnics based on MgB2 as the fuel

• Published in: Infrared physics & technology 2025-03, Vol.145, p.105684, Article 105684
• Main Authors: Huang, Jun, Yang, Jie, Meng, Wenqing, Guan, Hua
• Format: Article
• Language: English
• Subjects: Combustion performance; Infrared radiation; MgB2; MTV; Reaction mechanism
• ISSN: 1350-4495
• DOI: 10.1016/j.infrared.2024.105684

•Constructed the combustion model of MgB2/PTFE/Viton(MBTV) pyrotechnic.•MBTV has a lower onset reaction temperature and lower apparent activation energy than MTV and MTV-B.•The ignition delay time of MBTV is significantly shorter than that of MTV and MTV-B.•The combustion performance of MBTV is better than that of MTV and MTV-B, mainly in the combustion speed and radiation area.•MBTV has better infrared radiation characteristics and spectral patterns. The aim of this paper is to improve the ignition performance and infrared radiation characteristics of magnesium/polytetrafluoroethylene/fluoroelastomer (MTV) agents. In this study, magnesium diboride/polytetrafluoroethylene/fluoroelastomer (MBTV) agents were prepared and compared with the MTV system and the magnesium/boron/polytetrafluoroethylene/fluoroelastomer (MTV-B) system. Firstly, the reaction mechanisms of the three agents were proposed and the combustion model of the MBTV system was constructed by X-ray diffractometer and microcomputer differential thermal balance; then the apparent activation energies of the three systems were calculated with the help of the reaction kinetic parameters, and on the basis of which, the ignition delay times of the three agents were tested by using high-speed video camera with a direct-current power supply. Finally, the combustion and radiation properties of the three systems were tested using a spectroradiometer and a far-infrared thermographic camera. The results shows that the apparent activation energy of the MBTV system in the reaction initiation stage is 141.29 KJ/mol, which is lower than that of the MTV system and the MTV-B system; the ignition delay time of the MBTV system is 0.716 s, and the MTV did not fire under the same conditions, while the ignition delay time of the MTV-B was 3.804 s, which indicates that the MBTV is more likely to initiate the reaction under the same conditions. The burning rate of MBTV is 1.09 mm/s, and the radiation area was 165 cm−2; further more, the far-infrared radiation intensity and mass radiation energy of MBTV system are 7.11 W/sr and 14.9 J/g·Sr, and the ratio of near-medium to far-medium is 2.218 and 0.122, respectively. The MBTV system has excellent combustion and infrared radiation performance, and has a very broad application prospect in the field of energy-containing materials.