Features of the incorporation of single and double based powders within emulsion explosives

18th APS-SCCM; 24th AIRAPT

Ribeiro, J.B.^1 ; Mendes, R.^1 ; Tavares, B.^1 ; Louro, C.^2

ADAI/LEDAP-Assoc. for Dev. of Ind. Aerodynamics / LEDAP-Lab. Energetics and Detonics, Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, Polo II, Coimbra

3030-788, Portugal^1

CEMUC-Centro de Engenharia Mecãnica da Universidade de Coimbra, Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, Coimbra

3030-788, Portugal^2

关键词: Chemical compatibility;    Comparative evaluations;    Detonation velocity;    Emulsion explosives;    Experimental determination;    Individual components;    Rate of mass loss;    Thermodynamic equilibrium calculation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/19/192017/pdf
DOI  :  10.1088/1742-6596/500/19/192017

来源: IOP

【 摘 要 】

In this work, features of the thermal and detonation behaviour of compositions resulting from the mixture of single and double based powders within ammonium nitrate based emulsion explosives are shown. Those features are portrayed through results of thermodynamic-equilibrium calculations of the detonation velocity, the chemical compatibility assessment through differential thermal analysis [DTA] and thermo gravimetric analysis [TGA], the experimental determination of the detonation velocity and a comparative evaluation of the shock sensitivity using a modified version of the "gap-test". DTA/TGA results for the compositions and for the individual components overlap until the beginning of the thermal decomposition which is an indication of the absence of formation of any new chemical species and so of the compatibility of the components of the compositions. After the beginning of the thermal decomposition it can be seen that the rate of mass loss is much higher for the compositions with powder than for the one with sole emulsion explosive. Both, theoretical and experimental, values of the detonation velocity have been shown to be higher for the powdered compositions than for the sole emulsion explosive. Shock sensitivity assessments have ended-up with a slightly bigger sensitivity for the compositions with double based powder when compared to the single based compositions or to the sole emulsion.