To investigate the effect of the particle size of boron/potassium nitrate(BPN)components on the ignition sensitivity of Slapper-BPN type of exploding foil detonation initiator(EFDI),several BPN formulations consisted of boron powder(B)and potassium nitrate(KNO3)with different particle sizes were designed and prepared.The particle size of B powder was charac-terized by a laser particle size analyzer,and the characteristics of the quantity and volume particle size distributions of B pow-der were discussed.The influence of KNO3 particle size on the interface morphology of BPN agents were obtained through scanning electron microscopy(SEM).Based on the differential scanning calorimetry(DSC)data,the pre-exponential factor,apparent activation energy,the lowest thermal decomposition temperature,and the thermal explosion critical temperature of different BPN formulations were calculated,and the influence of BPN component particle size on its kinetic performance was an-alyzed.According to the Langlie method,the critical ignition voltage and standard error of different BPN formulations were ob-tained,and the effect of BPN kinetic performance and interface morphology of the agent on the ignition sensitivity were dis-cussed.The results indicate that the particle size of BPN components mainly affect the ignition sensitivity of EFDI from the ther-mal decomposition properties of BPN and the interface morphology of BPN grain.The increase in particle size of BPN compo-nents makes the lowest thermal decomposition temperature of BPN agents increase and reducies the ignition sensitivity of BPN.The decrease in particle size of BPN components alters the interface morphology of BPN grain,resulting in a denser accumula-tion of BPN particles,reducing the gaps between particles and agents,hindering the heat transfer channels of BPN,which finally reduces the ignition sensitivity of EFDI under low-density charging conditions.Therefore,the consistency of B powder particle size has a certain impact on the standard deviation of low-density BPN ignition sensitivity.
explosion mechanicsin-line exploding foil ignitionexploding foil initiator(EFI)spray dryinginterface morphol-ogy of drug columnBPNEFDI
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