LiF包覆对硼粉热氧化特性的影响  

Effect of LiF Coating on the Thermal Oxidation Characteristics for Boron Powder

作　　者：陈涛 张先瑞 王园园 黄凌 肖金武 

机构地区：[1]航天科技集团公司四院四十二所,湖北襄阳441003

出　　处：《含能材料》2013年第1期57-60,共4页Chinese Journal of Energetic Materials

摘　　要：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 for amorphous boron powder,the thermal analysis experiment of boron coated with LiF （B^LiF） was conducted by DSC-TG. Propellant samples containing B^LiF were prepared. The heat of detonation and heat of combustion were determined by an oxygen bomb calorimeter. The effects of B^LiF on the energy release features in primary combustion and after-burning processes of the propellant were discussed. The results indicate that in comparison with amorphous boron,^LiF shoWsa fast oxidation reaction at 599 ℃,and a39.9% higher percentage of boron participated in B/O reaction. The propellant containing B^LiF makes primary combustion and after-burning energy release efficiencies （ηc1 and η2） increased and combustion efficienciesof B enhanced significantly from 65.48% to 81.57%. This is due to the consumption of B2O3 layer on the boron particle surface via endothermic reaction of LiF and B2O3 at high temperature and the acceleration of B/O reaction.

关 键 词：材料科学 LIF 包覆 热分析 含硼富燃料推进剂 燃烧效率 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]