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含能材料  2013 

LiF包覆对硼粉热氧化特性的影响

DOI: 10.3969/j.issn.1006-9941.2013.01.013

Keywords: 材料科学,LiF,包覆,热分析,含硼富燃料推进剂,燃烧效率

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Abstract:

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(BLiF)进行热分析试验。制备了含BLiF的推进剂样品。采用氧弹量热计测试其爆热和热值。考察了BLiF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,BLiF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BLiF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。

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