ON DETONATION IN ZnS POWDER MIXTURES XII EPNM Symposium «Explosive Production of New Materials: Science, Technology, Business, and Innovatios» ON DETONATION IN ZnS POWDER MIXTURES V.S. Trofimov, E.V. Petrov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences, Chernogolovka

Thermodynamic criterion for detonation ability of reactive mixture 2 N.M. Kuznetsov Detonation and gas-dynamic discontinuities in phase transition of metastable substances / Journal of Experimental and Theoretical Physics, 1966, Vol. 22, №.5, pp. 1526–1531. A.G. Merzhanov, Yu.A. Gordopolov, V.S. Trofimov On the possibility of gasless detonation in condensed system / Shock Waves, 1996, Vol.6, №.3, pp. 157-159.

Histogram of powder mixture ZnS 3 Scheme of experiment Histogram of powder mixture ZnS Zn powder particles size 1–11 μm 1 − voltage input 2 − top cover 3 – reactor body 4 – bottom cap 5 – steel plate S powder particles size 11–35 μm

Thermodynamic equation of conservation of energy in the supersonic wave propagation of a chemical reaction in the reactive mixture 4 where: E(P,V) – is the specific internal energy of reaction product (ZnS); P – pressure; V –volume; E0 , V00 – specific internal energy and volume of starting ZnS mixture, respectively. Characteristics of reaction product (ZnS): ρ = 3950 kg/m3; V0 = 2.532×10-4 m3/kg; Cp = 477 J/kg·K; β = 1.97×10-5 1/K; a = 5000 m/s Gruneisen coefficient calculated for reaction product (ZnS): Г = 1.032 The calculated values ​​for starting ZnS mixture: V00 ≥ 2.602×10-4 m3/kg

ZnS mixture detonating for V00 within the range 5 Known as functions of V pressure Pb(V) and specific internal energy Eb(V) of reaction product (ZnS) For V > V0 = 2.532×10-4 kg/m3 and P = 0 Equation of the detonation adiabat of ZnS mixture for V  >  V0 For V < Vlim, where: ZnS mixture detonating for V00 within the range 2.602×10-4 ≤ V00 <  Vlim = 2.759×10-4 m3/kg.

6 Calculated parameters of ZnS mixture at the Jouguet point and measured values for fused TNT. V00, m3/kg D, m/s u, m/s V, m3/kg P, Pa ZnS 2.602×10-4 6144 1767 1.854×10-4 41.7×109 ZnS 2.703×10-4 5973 965 2.266×10-4 21.3×109 ZnS 2.723×10-4 5849 410 2.532×10-4 8.8×109 ZnS 2.740×10-4 5609 297 2.594×10-4 6.1×109 TNT 6.173×10-4 6980 1620 4.739×10-4 18.3×109 The detonation parameters of ZnS mixture for 2.602×10-4 ≤ V00 < 2.740×10-4 m3/kg and TNT are seen to be comparable.

7 Сonclusions: This implies that, even upon neglect of evaporation, the brisance of porous and bulk ZnS mixtures is comparable with that of common high explosives. A ZnS mixture may find practical application in those processes that require sufficiently strong shock impacts on materials and at the same time it is necessary to avoid explosive action of explosion products on the environment.

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