Radiance and burning properties of KBF4 in boron-based spectral matched infrared pyrolant

Abstract

Increasing the selective radiation of boron-based spectral matched pyrolant in the far infrared band (8–14 μm) can make the radiation spectrum of the infrared decoy agent close to the real target. In this study, by designing BF bonds to be generated the spectral efficiency in 8–14 μm of boron-based spectrum-matched infrared decoy was improved. Potassium tetrafluoroborate (KBF4) was used as a fluorine oxidizer in this experiment. The results show that different proportions of KBF4/B/KNO3 produce characteristic radiation peaks at 5 μm and 9 μm, which are provided by boron-containing compositions. And the near, middle and far infrared color ratio of the pyrotechnic composition is about 1.4/1/0.4. By comparing with the radiation spectrum of boron-based pyrotechnics containing polytetrafluoroethylene (PTFE), it is confirmed that BF bonds can be provided from KBF4 and emit characteristic radiation at 9 μm. Combined with TG-DTA, SEM-EDS analysis and REAL theoretical calculation results, a qualitative combustion model of KBF4/B/KNO3 system, which provides infrared radiation characteristics substances (FBO, BF3, etc.), was established. This paper explores the potential of KBF4 to introduce pyrotechnics as a key component of spectrum-matched infrared decoy.