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Volume 33 Issue 5
Sep 2019
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Chinese Journal of High Pressure Physics  > 2019  >  33(5): 054203.
LIU Yuanbin, REN Huilan, LI Wei, NING Jianguo. Influence of Particle Size of Aluminum Powder and Molding Pressure on Impact-Initiation of Al/PTFE[J]. Chinese Journal of High Pressure Physics, 2019, 33(5): 054203. doi: 10.11858/gywlxb.20190712
Citation: LIU Yuanbin, REN Huilan, LI Wei, NING Jianguo. Influence of Particle Size of Aluminum Powder and Molding Pressure on Impact-Initiation of Al/PTFE[J]. Chinese Journal of High Pressure Physics, 2019, 33(5): 054203. doi: 10.11858/gywlxb.20190712
shu

Influence of Particle Size of Aluminum Powder and Molding Pressure on Impact-Initiation of Al/PTFE

doi: 10.11858/gywlxb.20190712

  • State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

  • Received Date: 17 Jan 2019
  • Rev Recd Date: 26 Feb 2019
    Abstract
  • Aluminum-polytetrafluoroethylene (Al/PTFE) specimens with different aluminum particle sizes of 10, 30 and 200 ${\text{μ}}{\rm{m}}$ and different molding pressures were prepared by compression molding and sintering. The impact-initiation test was carried out with split Hopkinson pressure bar (SHPB), and the reaction of the reactive materials was recorded by a high-speed photography device. It shows that with the increase of molding pressure, the speed threshold of impact-initiation of the specimen increases and then decreases. When the particle sizes of aluminum powder is around 10 ${\text{μ}}{\rm{m}}$ or 30 ${\text{μ}}{\rm{m}}$, specimens with higher molding pressure can react with ignition delay time of 1000–1100 ${\text{μ}}{\rm{s}}$, causing a sudden drawdown of the speed threshold of impact-initiation; for the specimens with 200 ${\text{μ}}{\rm{m}}$ aluminum powder, the ignition delay time stays around 600 ${\text{μ}}{\rm{s}}$. The speed threshold of impact-initiation raises as the particle size of aluminum increases, under the same molding pressure. The impact ignition of the reactive material is related to the microscopic defects, the propagation of the stress wave in the SHPB device, the amplitude of the stress pulse and the destruction process of the material.

     

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