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Spherical Micro-nano Encapsulated Boron-based Energetic Materials with Improved Combustion Performance
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  • Yinghui Hu,
  • Xuwen Wang,
  • Jian Zhang,
  • Zhaoyang Zhu,
  • Xiaoting Ren,
  • Yulin Yang,
  • Kaifeng Lin,
  • Aimin Pang,
  • Yong Shuai
Yinghui Hu
Harbin Institute of Technology
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Xuwen Wang
Harbin Institute of Technology
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Jian Zhang
Harbin Institute of Technology
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Zhaoyang Zhu
Hubei Institute of Aerospace Chemotechnology
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Xiaoting Ren
Hubei Institute of Aerospace Chemotechnology
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Yulin Yang
Harbin Institute of Technology

Corresponding Author:[email protected]

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Kaifeng Lin
Harbin Institute of Technology
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Aimin Pang
Hubei Institute of Aerospace Chemotechnology
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Yong Shuai
Harbin Institute of Technology
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Abstract

The low energy release efficiency seriously hinders the application of Boron (B) powder as metal fuel in solid propellants. To overcome this issue, a series of B-based micro-nanospheres were produced by encapsulating B-based metastable intermixed composites (MICs) with ammonium perchlorate (AP) through a solvent evaporation-induced self-assembly (EISA) method in this work. A self-developed combustion system that contains ignition pool, indicator light, and high-speed camera to precisely monitor ignition delay time and burning time was utilized. The EISA-prepared B/Bi2O3/AP composite show higher combustion temperature (1435 oC) and shorter ignition delay time (379±25 ms) than physically mixed sample (1264 oC and 1035±63 ms). The isolated reaction units of B/Bi2O3/AP-EISA micro-nano composite accelerate heat transfer and accumulation and reduce sintering and agglomeration, thus promoting the combustion efficiency of B powder. This study presents a promising strategy by doping and encapsulating process to increase the combustion performance of B based metal fuel.