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In this paper, the reaction characteristic of a novel reactive material, which introduced bismuth trioxide (Bi 2 O 3 ) into traditional polytetrafluoroethylene/aluminum (PTFE/Al), is studied. The effect of Bi 2 O 3 with different content and particle size on the reaction behaviors of PTFE/Al/Bi 2 O 3 are investigated by drop-weight test and X-ray diffractometer (XRD), including impact sensitivity, energy release performance under a certain impact, and reaction mechanism. The experimental results show that the content of Bi 2 O 3 increased from 0% to 35.616%, the characteristic drop height of impact sensitivity ( H  50 ) of PTFE/Al/Bi 2 O 3 reactive materials decreased first and then increased, and the minimum H  50 of all types of materials in the experiment is 0.74 times that of PTFE/Al, and the particle size of Bi 2 O 3 affects the rate of H  50 change with Bi 2 O 3 content. Besides, with the increase of Bi 2 O 3 content, both the reaction intensity and duration first increase and then decrease, and there is optimum content of Bi 2 O 3 maximizing the reaction degree of the PTFE/Al/Bi 2 O 3 . Furthermore, a prediction model for the impact sensitivity of PTFE-based reactive material is developed. The main reaction products include AlF 3 , xBi 2 O 3 ·Al 2 O 3 , and Bi.

Impact-Induced Reaction Characteristic and the Enhanced Sensitivity of PTFE/Al/Bi2O3 Composites