Study On Desensitization Of Primary Explosive Nickel Hydrazine Azide (NHA)

This paper mainly researched on how to reduce the sensitivity of the new primary explosive Nickel Hydrazine Azide (NHA). The samples were gotten through different methods and different coating materials. Many performances were evaluated including bulk density, flowability, granule size, the minium ignition quality, flame sensitivity, static electronic discharge, impact sensitivity and friction sensitivity. The main results as follows:(1) NHA was coated with shellac in different concentration through three ways. Shellac in 3% was added in the solution at the temperature 75℃～80℃after the synthesis of NHA. The sample with shellac coating had larger size than that of the pure NHA. The flame sensitivity was reduced by 23%.(2) NHA was coated with stearic acid. Stearic acid was added into solution at the temperature 75℃～80℃and NHA was coated by meilting stearic acid. The sample with stearic acid coating had larger size than that of the pure one and had good flowability. The flame sensitivity was reduced obviously with the minimum 50% catch fire height decreasing to 8cm.(3) NHA was coated with MoS2 by adding MoS2 into Ni(Ac)2 directly after dipped in alcohol. Coating was formed during the process of synthesis. The sample with MoS2 coating had good flowability. The bulk density which was larger than that of the pure one was 0.7g/cm3. The minimum ignition quality was 30mg. The static electronic discharge was reduced by 60 times and the friction sensitivity was reduced from 50% to 0.(4) NHA was coated with Dextrin by in-situ coating method. The dextrin solution was added into Ni(Ac)2 solution directly and coating was formed during NHA synthesis. The optimum concentration of dextrin was 6%. The sample with Dextrin coating had good flowability. The minimum ignition quality was less than 60mg. The flame sensitivity was reduced by 30% in loose load condition. The static electronic discharge was reduced by 90 times.(5) NHA was coated with MoS2 and Shellac. MoS2 was added into Ni(Ac)2 solution first, then shellac was dripped into the solution after the synthesis of NHA. The flowability of the sample with MoS2 and Shellac coating was reduced. The minimum ignition quality became larger and was 80mg. The flame sensitivity was reduced by 34%.(6) NHA was coated with dextrin and MoS2. The two kinds of coating materials were added into Ni(Ac)2 solution directly. The sample we've gotten had uniformity granules and good flowability. The minimum ignition quality was 60mg. The flame sensitivity was reduced by 60% in loose load condition and by 18% at 20MPa. The static electronic discharge was reduced by 10 times.