2024年9月常州大学低碳清洁能源与安全高效燃烧科研团队孙运兰教授课题组2022级硕士研究生黄乃强在Journal of Materials Science期刊发表了题为“The synergy of polyvinylidene fluoride and CuO to enhance the combustion of boron powder”的研究论文。

 硼粉末因其显著的能量密度而被认为是推进应用的优良燃料。然而，硼氧化物(B₂O₃)对硼的影响非常严重。本研究采用溶解重结晶的方法将纳米CuO和PVDF包覆在B粒子的外层。利用它们的协同作用来增强硼的点火和燃烧性能。通过研究不同组分对样品热行为、燃烧过程、燃烧强度和燃烧产物的影响，得到的具体研究结果如下:

1. CuO促进PVDF的分解，导致(B/CuO₈)@PVDF₁₂体系的PIR温度降低。具体而言，当CuO的质量含量从0增加到8 wt%时，PVDF的初始分解温度从317.52 ℃降低到262.31 ℃。

2. CuO和PVDF可以缩短未改性B的点火延迟时间，增强其燃烧强度。(B/CuO₄)@PVDF₁₆样品的点火延迟时间比未改性B粉缩短了46.4%，火焰扩展速率从0.091显著增加到0.280 m s⁻¹，燃烧热增加了28.2%。

3. CuO和PVDF均能抑制B粉团聚，但抑制机理不同。CuO的存在加速了液态B₂O₃的挥发，阻止了熔融的B₂O₃团聚成较大的颗粒；而PVDF热分解产生的HF气体与B粉发生反应，破坏了B₂O₃层，抑制了B颗粒间的团聚。

     该论文第一作者黄乃强是常州大学2022级能源动力专业硕士研究生，常州大学孙运兰教授为通讯作者，常州大学是第一作者和通讯作者单位。该研究成果得到了国家自然科学基金和江苏省青蓝工程项目资助！

英文摘要：

Boron (B) powder is considered to be an excellent fuel for propulsion applications due to its remarkable energy density. However, B is severely affected by boron oxide (B₂O₃) on its surface. To solve this problem, polyvinylidene fluoride (PVDF) and copper oxide (CuO) coatings were applied onto B particles, leveraging their synergistic effects to enhance the ignition and combustion performance (ICP) of B. Various characterization methods and CO₂ laser ignition experiments were used to determine how PVDF and CuO impact B combustion. PVDF and CuO are helpful to improve the ICP of B. Especially for the (B/CuO₄)@PVDF₁₆ sample, it exhibits 28.2% higher combustion heat, 46.4% shorter ignition delay, and flame expansion rate (FER) increases from 0.091 to 0.280 m s^-1 versus unmodified B. Furthermore, PVDF suppresses B powder agglomeration during combustion. The present work provides a new idea for improving the combustion of B powder.

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原文链接： https://doi.org/10.1007/s10853-024-10203-8

撰稿：2022级硕士研究生黄乃强    审核：朱宝忠