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By: Myong Nam Ri, Jin Guk Pak, Hyo Bom Song, Chol Min Kim, and Su Il Kim.
Assistant prof., High-Tech Research and Development Center, Kim Il Sung University, Pyongyang, emocratic People’s republic of Korea
As a salt of a coordination compound of nickel, nickel hydrazine nitrate (NHN) is an energetic substance with characteristics halfway between those of primary and secondary explosives. It is less sensitive to friction and mechanical impact than other primary explosives, although it is highly sensitive to flames. NHN is not very dangerous to handle, but it explodes readily when exposed to flame. This property makes it possible to fabricate safety detonators with high detonation reliability and detonation capacity. NHN was synthesized by reacting solution of Ni(NO3)2·6H2O and N2H4·H2O and structural analyses performed by Fourier-transform infrared spectroscopy. Single component-detonator using NHN consists of detonator body, reinforcing plug, secondary charge, and primary charge. A rational way to avoid the deformation and destruction of the paper tube from moisture is to use a low-cost and moisture proof tube, so detonator body was made of polyethylene tube. Both primary and secondary charges are prepared using only NHN, which can cause accidents in charging process. The stability of the charging process can be ensured by NHN whose moisture is about 10%, and which is treated with 3% PVA solution. The effect of charging density and charging quantity on the primary and secondary charges in the optimum detonator structure determined through several experiments was investigated. The charging conditions of DDT detonator (deflagration to detonation transition detonator) using nickel nitrate hydrazine were determined. The priming ability of DDT detonator was evaluated by the penetration test using 5 mm lead plate.
Citation:
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