Abstract Composite powders combining boron with BiF3 and Bi in different amounts were prepared by high energy milling. Thermal analysis in an argon-oxygen mixture showed significant oxidation starting about 200 K lower than for pure boron. Selective oxidation of metallic Bi at low temperatures was observed. Composites containing either Bi or BiF3 ignited more readily than pure boron when heated by a CO2 laser beam. The composites containing BiF3 ignited more readily than boron when in contact with a hot wire. Burn times of particles aerosolized in air and ignited using the CO2 laser were measured as durations of the recorded emission pulses produced by burning particles. Statistical distributions of the measured burn times were correlated with the respective powder's particle size distributions. Compared to elemental boron, burn times of all prepared composites were shorter, including those containing only 10 wt.% of BiF3 or ca. 8 wt.% of Bi, and for most composites combustion temperatures were higher.

中文翻译：

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B·BiF3和B·Bi复合材料中硼含量对其点火和燃烧的影响

摘要 通过高能球磨制备了硼与不同量的BiF3和Bi复合粉末。氩氧混合物中的热分析表明，明显的氧化开始比纯硼低 200 K。观察到金属铋在低温下的选择性氧化。当被 CO2 激光束加热时，含有 Bi 或 BiF3 的复合材料比纯硼更容易点燃。当与热线接触时，含有 BiF3 的复合材料比硼更容易点燃。在空气中雾化并使用 CO2 激光点燃的颗粒的燃烧时间被测量为由燃烧颗粒产生的记录发射脉冲的持续时间。测得的燃烧时间的统计分布与相应粉末的粒度分布相关。与元素硼相比，所有制备的复合材料的燃烧时间都更短，包括那些仅含有 10 重量％的 BiF3 或大约 10 ％的复合材料。8wt.%的Bi，对于大多数复合材料来说，燃烧温度更高。