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为了考察不同LiF包覆量对硼粉燃烧性能的影响，采用重结晶法制备了LiF包覆量为1 wt.%、2 wt.%及3 wt.%的硼粉共3个样品。利用扫描电子显微镜、能谱仪、激光点火平台、燃烧测试仪、密闭爆发器及氧弹热量计等仪器分别对B95硼粉、不同LiF包覆量硼粉的微观形貌、表面元素分布、点火延迟时间、燃速、燃压及燃烧热值等性能进行表征。结果表明：LiF包覆硼粉较普通B95硼粉点火延迟时间明显缩短，燃速提高，燃烧峰值压力增加且燃压增加速度加快；随着LiF包覆量增加，点火延迟时间逐步缩短，燃速加快，燃烧峰值压力和燃压增加速度增大，说明LiF包覆对促进硼粉的快速点火和持续燃烧都有作用，包覆量越大，改善作用越明显；通过氧弹量热仪测试燃烧热值表明：经过LiF包覆后的样品，燃烧热值较普通B95硼粉获得较大提升，但LiF包覆量达到3 wt.%时，燃烧热值变化较小，其促燃作用已发挥较充分。
Abstract：To investigate the effect of different LiF coating amounts on the combustion performance of boron powder,three samples with LiF coating contents of 1 wt.%,2 wt.%,and 3 wt.% were prepared using the recrystallization method.Scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),a laser ignition platform,a combustion tester,a closed bomb calorimeter,and an oxygen bomb calorimeter were employed to characterize the microstructure,surface elemental distribution,ignition delay time,burning rate,combustion pressure,and combustion heat value of B95boron powder and the LiF coating samples.The results show that,compared with uncoated B95 boron powder,the LiFcoated samples exhibit significantly reduced ignition delay times,increased burning rates,higher peak combustion pressures and faster pressure rise rates. With increasing LiF coating content,the ignition delay time decreases progressively,while the burning rate,peak combustion pressure,and pressure rise rate all increase. This indicates that LiF coating promotes both rapid ignition and sustained combustion of boron powder,and that the enhancement effect becomes more pronounced with higher coating levels.Oxygen bomb calorimetry results indicate that the combustion heat value of LiF coating samples is significantly higher than that of uncoated B95 boron powder. However,when the LiF coating content reaches 3 wt.%,the increase in combustion heat value becomes marginal,suggesting that the combustion-promoting effect of LiF has been substantially realized.
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基本信息:
DOI：10.20242/j.issn.2097-5384.2025.06.007
中图分类号:V512;TQ560.1
引用信息:
[1]王彦军,于月光,张鑫,等.LiF包覆量对硼粉燃烧性能影响研究[J].有色金属(中英文),2025,15(06):956-962.DOI:10.20242/j.issn.2097-5384.2025.06.007.