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为考察LiF包覆对硼粉热氧化特性的影响,采用DSC-TG技术对LiF包覆硼(BLiF)进行热分析试验。制备了含BLiF的推进剂样品。采用氧弹量热计测试其爆热和热值。考察了BLiF对推进剂一次、二次燃烧过程中能量释放特性的影响。结果表明:与无定形硼相比,BLiF在599℃存在快速氧化反应,有39.9%(质量百分数)的B参与了B/O反应。含BLiF的推进剂使一次能量释放效率和二次能量释放效率明显提高,硼的燃烧效率从65.48%提高到81.57%。这是由高温下LiF通过吸热反应消耗硼粉表面B2O3氧化层,加速B/O反应所引起的。
In order to investigate the effect of LiF coating on the thermal oxidation characteristics of boron powder, thermal analysis of LiF coated boron (BLiF) was carried out by DSC-TG technique. A BLiF-containing propellant sample was prepared. Oxygen bomb calorimeter test its burst heat and calorific value. The effect of BLiF on the energy release characteristics of primary and secondary combustion of propellants was investigated. The results show that BLiF has a rapid oxidation reaction at 599 ℃ compared with amorphous boron, and 39.9% (mass%) B participates in the B / O reaction. The BLiF-containing propellants improved the primary energy release efficiency and the secondary energy release efficiency significantly, and the combustion efficiency of boron increased from 65.48% to 81.57%. This is caused by the fact that LiF consumes the B2O3 oxide layer on the surface of the boron powder through an endothermic reaction at a high temperature to accelerate the B / O reaction.