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Preparation of Bi2O3/Al Core-Shell Energetic Composite by Two-Step Ball Milling Method and Its Application in Solid

Min Xia1, Qifa Yao2, Huilian Yang3

  • 1School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China. xminbit@bit.edu.cn.

Materials (Basel, Switzerland)
|June 20, 2019
PubMed
Summary

High-density energetic composites of bismuth oxide (Bi2O3) and aluminum (Al) were created using ball milling. These core-shell structures significantly enhance propellant density and energy output for improved performance.

Keywords:
Bi2O3/Alball millingdensitydensity specific impulsepropellant

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Area of Science:

  • Materials Science
  • Energetic Materials
  • Nanotechnology

Background:

  • Development of high-density energetic materials is crucial for advanced applications.
  • Core-shell structures offer unique properties for energetic composites.
  • Bismuth oxide (Bi2O3) and aluminum (Al) are key components in energetic formulations.

Purpose of the Study:

  • To prepare and characterize Bi2O3/Al core-shell energetic composites.
  • To optimize ball milling conditions for enhanced density and properties.
  • To evaluate the impact of these composites on the performance of insensitive Hydroxyl terminated polyether (HTPE) propellant.

Main Methods:

  • Two-step ball milling method using a planetary ball mill.
  • Morphological, structural, and property characterization of the composites.
  • Differential Scanning Calorimetry (DSC) for thermal analysis.
  • Theoretical calculations and experimental tests on HTPE propellant formulations.

Main Results:

  • Achieved an 11.3% density increase in Bi2O3/Al composites compared to physical mixtures.
  • DSC tests confirmed a high exothermic quantity (2112.21 J/g) close to theoretical values.
  • Incorporation into HTPE propellant increased density to 2.056 g/cm3 and density specific impulse to 502.3 s·g/cm3.

Conclusions:

  • The Bi2O3/Al core-shell structure prepared by ball milling is an effective high-density energetic material.
  • These composites significantly improve the energy performance of HTPE propellant.
  • The optimized composite offers superior density and specific impulse compared to conventional propellants.