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SOLID-STATE DETONATION SYNTHESIS

SOLID-STATE DETONATION SYNTHESIS. Yu.A. Gordopolov, D.L. Gur’ev, S.M. Gavrilkin and S.S. Batsanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences Chernogolovka, Moscow Region, 142432 Russia. Shock Detonation. adiabat adiabat. P. P.

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SOLID-STATE DETONATION SYNTHESIS

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  1. SOLID-STATE DETONATION SYNTHESIS Yu.A. Gordopolov, D.L. Gur’ev, S.M. Gavrilkin and S.S. Batsanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences Chernogolovka, Moscow Region, 142432 Russia

  2. Shock Detonation adiabat adiabat P P Chapman–Jouguet point D > c0 Michelson line V X ZEL'DOVICH THEORY OF DETONATION Peak pressure Shock front Normal pressure P0 V0 PREREQUISITES FOR DETONATION: • the chemical reaction must be exothermic • the reaction products must expand upon relaxation (to normal pressure) • the reaction must be sufficiently rapid CRITERION OF DETONABILITY: VP0 ,H0> 0

  3. INVESTIGATED REACTIONS GREEN MIXTURES

  4. PRELIMINARY EXPERIMENTAL RESULTS Experimental setup (cylindrical cell 40 mm in diametr and 75 mm long) Piezoelectric gauge signal (polyvinylidene fluoride/PVDF) detonator high explosive (TNT/RDX, D=7.85 km/s) Experimental data contact gauge thin steel plate System L, mm D, km/s 35 mm Zn - S 35 55 75 2.4 2.1 2.2 piezoelectric gauge container (porous material, foam plastic) 20 mm piezoelectric gauge Zn - Te 35 55 75 2.3 1.5 1.3 20 mm green mixture piezoelectric gauge Cd - S 35 55 75 2.4 1.8 1.7 steel stand

  5. EXPERIMENTAL RESULTS ON Zn-S SYSTEM Experimental data Experimental setup (cylinder cell 40 mm in diameter and 40-200 mm long) Experimental run L, mm D, km/ s ΔD, % ρ, % c0, km/s 0.59 1 40 2.28 0.6 68 2 60 1.29 0.2 63 0.37 detonator 0.74 3 75 3.01 0.2 72 0.27 4 90 1.63 0.2 61 high explosive (TNT/RDX, D=7.85 km/s) 5 100 5.27 0.2 62 0.34 contact gauge 0.39 6 150 1.53 0.1 64 7 200 2.52 0.1 60 0.21 Zn-S sample container (porous material, foam plastic) L piezoelectric gauge (PVDF) 7 stand wire leads to oscilloscopes

  6. CONCLUSION •Self-sustaining propagation of reaction wave at supersonic velocities, i.e. detonation mode was observed in gasless metal-chalcogen systems Zn-S, Zn-Te and Cd-S. •In the Zn-S system pulsed detonation mode was observed which can be associated with a reversible phase transition between two modifications with different density and periodic violation of the detonability criterion. •Detonation mode of synthesis was observed in approximately half experimental runs. Reproducibility of solid-state detonation in the systems under consideration as well as structure/properties of synthesis products deserves further investigation.

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