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Department of Explosion Laboratory of High-Speed Processes Laboratory of Dynamic Loading

Department of Explosion Laboratory of High-Speed Processes Laboratory of Dynamic Loading. Shock synthesis:. β -Si 3 N 4 → c- Si 3 N 4 ►. nano-dispersive powder. H V , GPa. P i , g. Laboratory of High-Speed Processes. Super-hard materials: Cubic silicon nitride.

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Department of Explosion Laboratory of High-Speed Processes Laboratory of Dynamic Loading

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  1. Department of Explosion Laboratory of High-Speed Processes Laboratory of Dynamic Loading

  2. Shock synthesis: β-Si3N4 →c-Si3N4► nano-dispersive powder HV, GPa Pi, g Laboratory of High-Speed Processes Super-hard materials:Cubic silicon nitride Static HPHT burning: 1100°C, 5-6 GPa, 1-5 hours ► nano-bulks Micro-hardness vs load to indenter► 1-3 – our, 4-5 – Japan, 6-7 – USA 2-fold harder than others Scale – 1 mm

  3. Investigation of detonation and shock waves by synchrotron radiation • 1-D and 2-D density distribution behind shock and detonation front • SAXS for kinetics of crystal phase and cracks growing during explosion events • Dynamic X-ray diffraction • Technical data: • SR beam 15x0.1 mm in size, exposure – 1 ns, repeat – 250 ns • Energy of γ-quantum up to 20 kV • X-ray quantometer up to 256 channels • single detector 0.1 mm in width • explosive chamber up to 50 g of HE investigated

  4. Hardware for experiments

  5. Laboratory of Dynamic Loading Staff:3 professors, 2 senior researchers (Ph.D),1research officer Principal research topics: Investigation of pulse loading and deformation processes of homogeneous and heterogeneous media for developing of advanced materials. Equipment:explosive chambers, digital oscilloscopes, pulse generators, scanning electron microscope, optical microscopes. Explosive chambers: a) KV-2, max weight of explosive charge is 1 kg, b) VK-15 max weight of explosive charge is 5 kg. b a Scanning electron microscope LEO-420 with X-ray microanalyser RONTEC

  6. Explosive welding: a) fragments of heat exchanger and crystallizer, b) multi-layer composite materials. b a Explosive compaction: metal-ceramic composite materials and products.

  7. Developing microcrystalline materials by dynamic methods Microstructure of compact from internally oxidized copper alloy Cu - 0,4%Al Fragmentation in form of block structures is visible after shock-wave loading of fine-grained materials

  8. Measurement of a cumulative jettemperature b a The experimentalset-up (a) and a photo of measuring element (b) for measurement of temperature of a metal jet. 1 – the copper cylinder with semispherical hollow, 2 - the insertion from constantan, 3 - a rod from constantan, 4 - a compound charge of explosive, 5 - a detonator. The X-ray photograph of impact of a cumulative jet and a rod.

  9. Measurement of mass velocity behind shock wave front in powder The set-up (a) and a photo (b) of experimental assembly: 1 - a researched powder, 2 - an aluminium foil, 3 - a coil - source of a magnetic field, 4 - the measuring coil, 5 - a com-pound charge of explo-sive, 6 - a detonator. ( D - u) - the diagram of shock compression Al2O3 powder with initial density 1.06 g/sm3.

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