Metal-fluorocarbon pyrolants. XIV: High density-high performance decoy flare compositions based on Ytterbium/Polytetrafluoroethylene/Viton?

摘要

Three pyrotechnic compositions based on ytterbium /polytetrafluoroethylene/ Viton? (YTV) 77/18/5, 82/13/5 and 87/8/5 wt.-% were compared to a baseline magnesium /polytetrafluoroethylene/Viton? (MTV) 60/35/5 wt.-% composition. YTV though energetically inferior to MTV both gravimetrically and volumetrically exhibit a radiance L _? (W·sr ~(-1)·cm ~(-2)) superior to MTV in the important beta-band (? = 3.5-4.6 μm). This is assumed to be due to the selective emissivity of Yb _2O _3 which is formed in the afterburning zone of YTV. The emissivity of Yb _2O _3 is 7-10 times higher than that of MgO in the same spectral range. Due to the high density of ytterbium and the formulations based thereon YTV are promising candidates for autophagous nose cones for kinematic blackbody flares.