Study On The Application Safety Performance Of An Aluminized Explosive

To ensure the detonation performance and safety performance of aluminized explosive,the study on formulation design and application safety was conducted by theoretical and experimental methods,focusing on the mechanical sensitivity,exterior compatibility and storage performance.The research above provided important basis for the safety evaluation of aluminized explosive during its practical application.The formulation design was based on the principle of energy and power maximization.A mathematical model with explosion heat as optimization object was established to obtain the best ratio of RDX and Al in theory.Based on this ratio,taking the influence of bonding insensitive system on both the formability and the final forming condition into consideration,the formulation was designed as 60.6 RDX/29.4 Al/10 bonding insensitive system.The principle of safety performance was applied to select suitable aluminum.Comparing and analyzing the advantages and disadvantages of spherical aluminum and sheet aluminum,spherical aluminum was chosen from the view of preparation process.The mechanical sensitivity test was implemented to characterize the effect of aluminum size on safety performance.Results showed that with the decreasing of aluminum size,the friction sensitivity increased and the changes in impact sensitivity presented an irregular decrease.The FLQT2 aluminum whose formulation had low impact sensitivity and acceptable friction sensitivity was selected for sample preparation.For the compatibility of the explosive sample with different materials,vacuum stability test was conducted to judge the compatibility,with differential scanning calorimetry for supplementary verification.Results indicated that there were only nine types materials of all the tested materials considered to be compatible with the explosive not only by VST,but also DSC method as a supplementary verification.It was concluded that the explosive could be used normally in contact with the nine types materials owing to its low risk.The results of metal corrosion method stated that the explosive did not generate corrosion to the aluminum before and after anodic oxidation,but the steel and the galvanized steel was corroded seriously and slightly respectively.Experiments on accelerated aging were carried out to study the influence of aging on physical,safety and mechanical properties.The results of the test of the mass and volume,microstructure,FTIR and XPS demonstrated that the physical performance was not affected by the aging test significantly.Through the characterization of mechanical sensitivity,vacuum stability and thermal stability,conclusions could be drawn that the explosive before and after aging possessed good safety performance.The data of mechanical property test showed the compression strength,the splitting tension strength and the shear strength exhibited an increase with longer aging days respectively.The storage life of this explosive was evaluated as 16 years through the significance test of a sensitivity parameter(i.e.detonation velocity).