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Radiative Properties of a Red Phosphorus Based Combustion Flame

Koch Ernst-Christian

Central European Journal of Energetic Materials

2022

Vol. 19, no. 1

5--17

The spectral energy, Eλ (in J·g–1·sr–1), of a model obscurant composition containing red phosphorus (P(red), 59 wt.%), Zr (15 wt.%), potassium nitrate (KNO3, 21 wt.%) and a polyacrylate binder (5 wt.%), was determined in band II (λ = 3-5 μm) and band V (λ = 8-14 μm). The spectral energy obtained in band V was higher than the spectral energy in band II. The band ratio V/II and spectral energy indicated that the combustion flame of the pyrolant cannot be described as a graybody. A combined DTA/TG analysis under anaerobic conditions revealed an initial exotherm followed by an endothermic process, the latter coinciding with a mass loss of >40 wt.%, indicative of the vaporization of P(red).