高 燃 烧 效 率 含 卤 氧 化 剂 包 覆 硼 粉 的 制 备 及 性 能

In order to improve the ignition and combustion performance of boron powder, four kinds of microand nano B-Fe-Bi₂O₃@AP/PVDF composite were prepared by high-energy ball milling combined with spray drying method. According to their high calorific value and high combustion efficiency, four composite were named as μBHH_c, μBHC_e, nBHH_c, and nBHC_e. Their morphology, thermal reactivity, ignition delay time, mass burning rate and condensed phase combustion products were characterized and analyzed. The results show that the maximum calorific value of μBHH_c and μBHC_e composite in argon is 9.7 kJ·g^-1, and the maximum combustion efficiency in argon is 66.2 %. The maximum calorific value in oxygen is 14.6 kJ·g^-1, the maximum combustion efficiency in oxygen is 93.3%, and the oxidation peak temperature is between 750 ℃ and 760 ℃. The maximum calorific value of nBHH_c and nBHC_e composite in argon is 9.9 kJ·g^-1, and the maximum combustion efficiency in argon is 68.9%. The maximum calorific value in oxygen is 14.8 kJ·g^-1, the maximum combustion efficiency in oxygen is 97.2%, and the oxidation peak temperature is between 595 ℃ and 600 ℃. The highest combustion temperature of all kinds of composite is between 1954 ℃ and 2011 ℃. The ignition delay time of nBHH_c composite is the shortest(26 ms), while the mass burning rate is the highest(1.84 g·s^-1). The μBHC_e composite has the longest ignition delay time(39 ms)and the lowest mass burning rate(0.80 g·s^-1). The condensed phase combustion products of various composites are mainly composed of B₂O₃, B₄C and a small amount of incompletely burned boron. The morphology of condensed phase combustion products includes 5-10 μm spheres and 10-20 μm flakes.