Effect of Mg-Al ratio on the combustion and infrared radiation properties of Al-Mg alloy/PTFE composition

Abstract The effects of Al-Mg alloys with different Mg/Al ratios on the burning rate, combustion products, radiation intensity and specific radiation energy of Al-Mg/PTFE infrared composition were investigated in this paper. The results show that the burning rate of Al-Mg/PTFE decrease with the increase of Al content in Al-Mg alloy. The results of theoretical calculations show that as the Al content increases, the adiabatic combustion temperature first decreases and then increases, taking the minimum value when the content of Al is approximately 58%. In addition, as the Al content of the alloy increases, the particle size of the reaction products gradually become larger, in which the unreacted Al and Al 4 C 3 content increase, while the yield of C and MgF 2 become less. The infrared radiation intensity also decreases with the decrease of burning rate. The specific radiant energy of Al-Mg/PTFE reaches the maximum value at 8-14 μm when the ratio of Mg/Al is 30/70 under the combined effect of burning rate and combustion temperature.