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Schematische Darstellung eines Versuches für planaren Impakt
TUBAF
Schematic representation of an experiment for planar impact

Schematic diagram of an experiment for planar impactIn this method, the detonation of explosives accelerates a flat flying plate to several km/s, which then collides with the sample container and generates pressures of several gigapascals in it. The process is suitable for synthesising high-pressure phases in powder form, but also for compacting powders into compact bodies.

  • Pressure range 15...200 GPa
  • Calculation of pressure, temperature and temporal progression using Matlab codes
  • Pressure build-up via single-shock (impedance method) or multiple shock (reflection method) possible
    • Impedance method: simple pressure build-up, extreme heating of the sample, max. pressure approx. Pressure approx. 50-60 GPa, sample volume approx. 2.5...20 cm3
    • Reflection method: gradual pressure build-up, low heating of the sample, max. Pressure up to 200 GPa, sample volume 0,7 cm3
  • Container welded gas-tight during shock test (recovery and analysis of gaseous reaction products possible)
  • Full sample recovery possible due to impedance-corrected test arrangement [1]
  • Good reproducibility of results
  • Control of the melting behaviour along the relaxation curve [2]
  • Mixing sample with different impedance powders for different pressure and temperature conditions (metals or metals and temperature).temperature conditions (metals or salts for salts for "mild" reaction conditions) [3]
  • Preventing "upstream jetting" by gradually pre-compacting the sample powders to reduce density gradients [4]

[1] T. Schlothauer, Establishment of the shock wave laboratories in the teaching and research mine "Reiche Zeche" of the TU Bergakademie Freiberg and the development of dynamic ultra-high pressure synthesis methods, Dissertation, 2016.

[2] T. Schlothauer, C. Schimpf, M.R. Schwarz, G. Heide, E. Kroke, The role of decompression and micro-jetting in shock wave synthesis experiments. In: Journal of Physics: Conference Series 774, S. 012053, 2016. doi:10.1088/1742-6596/774/1/012053.

[3] T. Schlothauer, C. Schimpf, E. Brendler, K. Keller, E. Kroke, G. Heide, Halide based shock-wave treatment of fluid-rich natural phases. In: Journal of Physics: Conference Series 653, p. 12033, 2015.

[4] Y. B. Gu, S. Zhang, M. Vural, A. Molinari, G. Ravichandran, Upstream jetting phenomenon in planar shock wave experiments with ceramic powders, In: Shock Waves 20, pp. 387-393, 2010.