摘要
硼粉因其较高的质量热值、体积热值和洁净的燃烧产物,常被用作可燃剂,然而硼粉表面的氧化层使硼粉点火困难且燃烧效率低。为此,研究利用氧化硼在乙腈溶剂中易溶解的特性,以热乙腈为控制剂湿法球磨硼粉,去除其表面氧化膜得到活性较高的预处理硼粉;再以乙腈-正己烷为双控制剂,将其与高活性金属铝二次球磨得到硼铝质量比分别为10/90,20/80,30/70,40/60的硼铝复合粉。对预处理硼及硼铝复合粉的形貌特征、热重、点火与燃烧特性进行了测试。结果表明:预处理硼粉的表面氧化硼含量降低,在空气中加热时更容易与氧气反应,质量增加百分数比未处理的硼粉多25.6%;所得硼铝复合粉的表面氧化硼的含量降低,活性硼含量增高,点火燃烧性能显著得以改善,其中硼铝质量比例为60/40的复合粉在空气中加热质量增加93%,低加热速率下点火温度为738.1℃,颗粒燃烧时间为11.2 ms。
Boron powder is often used as a combustible agent in energetic materials due to its high calorific value,volume calorif-ic value and clean combustion products.However,the surface oxide layer of boron powder makes it difficult to ignite and brings low combustion efficiency.In order to improve the ignition and combustion performances,boron powder was wetly milled in hot acetonitrile to remove the surface oxide layer for obtaining pre-treated boron powder with high activity,according to the good solubility of boron oxide in acetonitrile solvent.Acetonitrile and n-hexane were used as a dual control agent,and then the pretreated boron powder and highly active aluminum were performed a secondary ball milling to finally prepare the boron-aluminum composite powder with surface-activated boron.The morphological characteristics,thermogravimetric,igni-tion and combustion characteristics of boron and composite powder were studied.The results showed that the content of surface boron oxide of boron powder was reduced after pretreatment with acetonitrile,pretreatment boron powder was easier to react with oxygen when heated in air,and the percentage of mass increase was 25.6%more than that of untreated boron powder.Af-ter pretreatment with hot acetonitrile,the surface boron oxide content decreased,the active boron content increased,and the ig-nition and combustion performances were significantly improved.The mass of composite powder with boron-aluminum mass ra-tio of 60/40 increased by 93%when heated in air,the ignition temperature was 738.1℃at low heating rate,and the particle combustion time was 11.2 ms.
作者
伍俊英
王健宇
刘新航
胡良
尚伊平
刘丹阳
陈朗
WU Jun-ying;WANG Jian-yu;LIU Xin-hang;HU Liang;SHANG Yi-ping;LIU Dan-yang;CHEN Lang(National Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China)
出处
《含能材料》
北大核心
2025年第6期581-588,共8页
Chinese Journal of Energetic Materials
关键词
改性硼粉
硼铝复合粉
预处理
点火
燃烧
modified boron powder
boron-aluminum powder
pretreatment
ignition
combustion
作者简介
伍俊英(1977-),女,副教授,主要从事含能材料、火工品、多尺度计算等研究。e‑mail:wjy1312@bit.edu.cn;通信联系人:伍俊英(1977-),女,副教授,主要从事含能材料、火工品、多尺度计算等研究。e‑mail:wjy1312@bit.edu.cn。
