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Shock Waves

, Volume 28, Issue 2, pp 153–161 | Cite as

Effect of graphite particle size and content on the formation mechanism of detonation polycrystalline diamond

  • Y. Tong
  • Y. Cao
  • R. Liu
  • S. Y. Shang
  • F. L. Huang
Original Article

Abstract

The formation mechanism of detonation polycrystalline diamond (DPD) generated from the detonation of a mixed RDX/graphite explosive is investigated. It is found experimentally that the DPD conversion rate decreases with both the content and the particle size of the graphite. Moreover, the particle sizes of the generated DPD powder are analyzed, which shows that, with the decrease in the graphite particle size, the mean number diameter of DPD decreases, but the mean volume diameter increases. In addition, with the help of scanning electron microscopy, it is observed that the in situ phase change occurs in the graphite particles, by which the small particles combine to form numerous large DPD particles. Based on both the experimental data and the classical ZND detonation model, we divide such a DPD synthesis process into two stages: In the first stage, the in situ phase change from graphite to diamond is dominant, supplemented by some coalescence growth at high pressure and temperature, which is affected mainly by the detonation performance of the mixed explosive under consideration. In the second stage, the graphitization of DPD caused by the residual heat is dominant, which is affected mainly by the unloading rate of the particle temperature.

Keywords

Detonation Polycrystalline diamond Graphite Phase change 

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation of China under Grant Nos.11521062 and 11572047.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijingChina
  2. 2.Naval Academy of ArmamentBeijingChina
  3. 3.No.1 Institute of Design, China Wuzhou Engineering GroupBeijingChina

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