Effect Of Negative Pressure On Detonation Performance Of Emulsion Explosive And Application Of Explosive Welding

With the rapid development of industrial explosives,its application in engineering blasting,special blasting and other fields has become more and more mature.Among them,emulsion explosives,as water-containing explosives,have been deeply researched and used because of their good water resistance,stable detonation performance and storage performance,low production cost,and safe use.However,in industrial applications,emulsion explosives still face problems such as low explosive power and unstable performance in complex environments at low temperature and low pressure.In this paper,energetic resin microspheres are introduced into the emulsion matrix as bubble sensitizers to prepare a high powerful emulsion explosives.At the same time,the change trend of the explosive performance of the energetic resin microsphere sensitized emulsion explosive and the traditional emulsion explosive under different vacuum environments was explored.Carry out the aluminum/steel explosion welding test under negative pressure environment.Energetic resin microspheres with different contents were added to the emulsification matrix to prepare sensitized emulsion explosives with different contents of microspheres.The detonation velocity test showed that with the increase of microsphere content,the detonation velocity first increased and then decreased.When the content of microspheres was 0.6%,the highest detonation velocity was 5245 m·s^-1.The detonation performance of this emulsion explosive was compared with that of glass microsphere sensitized emulsion explosive and chemical sensitized emulsion explosive.The sensitized emulsion explosives were increased by 5.32%and 3.05%respectively;the detonation heat of the energetic resin microspheres sensitized emulsion explosives measured by detonation calorimeter was 4423.5 k J·kg^-1,which was higher than that of the glass microspheres sensitized emulsion explosives and chemical emulsion explosives.The sensitized emulsion explosives are increased by 8.75%and 5.11%respectively.The above experimental results all show that the explosive performance of the sensitized emulsion explosives containing energetic resin microspheres is better than that of the traditional formula emulsion explosives.Applications have certain research significance.Using the air explosion experiment and changing the experimental environment,the explosion shock wave pressure curves of the emulsion explosive in different vacuum environments（0～-80 KPa）were obtained.The shock wave overpressure of the microsphere sensitized emulsion explosive is the largest,which is 18.4%and 8.2%higher than that of the glass microsphere sensitized emulsion explosive and the chemical sensitized emulsion explosive,respectively.Under the negative pressure environment,with the increase of vacuum degree,the parameters such as peak pressure,positive pressure action time and impulse of the three emulsion explosives all decrease to varying degrees.The decreasing trend of the parameters is relatively slow,while the parameters of chemically sensitized emulsion explosives decrease greatly.When the vacuum degree is-80 KPa,the shock wave peak pressure of energetic resin microspheres sensitized emulsion explosives and glass microspheres sensitized emulsion explosives The attenuations are up to 11.02%and 11.47%respectively,and the impulse attenuations are up to 46.81%and 44.50%,respectively,while the shock wave overpressure attenuation of chemically sensitized emulsion explosives is as high as 39.69%,and the impulse attenuation is as high as 72.34%.Emulsion explosives sensitized with energetic resin microspheres are used as carriers,and a certain content of industrial salt is added as diluents to prepare explosives for explosive welding.Steel explosion welding test,the experimental results show that the tensile strength of the metal specimen is relatively increased by about 8.06%under the negative pressure environment.Compared with the negative pressure environment,in the normal pressure environment,there is an obvious phenomenon of thicker melting layer and more holes at the interface of the explosive welded composite plate.Figure 50 table 14 reference 99...