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Schematische Darstellung eines Versuches für planaren Impakt
TUBAF

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.