微流控制备B/KNO3点火药及其燃烧性能研究OA

To address issues such as uneven component distribution and significant variability in ignition performance of B/KNO₃propellants prepared by traditional mechanical mixing methods,microfluidic technology was employed to achieve in-situ prepa-ration of this propellant.The numerical simulation was carried out by FLUENT software to optimize the droplet formation condi-tions,and the optimal flow velocity ratio of continuous phase and dispersed phase was determined to be 10∶1.Under this pro-cess,the in-situ recrystallization of KNO3 and the in-situ doping of graphene oxide and Fe2O3 were realized with the help of mi-crofluidic technology,using absolute ethanol as the continuous phase and KNO3 aqueous solution containing boron powder(b),phenolic resin(PF)and graphene oxide/Fe2O3 as the dispersed phase.Structural and thermal properties were characterized using SEM,EDS,BET,FTIR,and TG-DSC;thermal decomposition kinetics parameters were calculated via the Kissinger meth-od,and combustion time consistency was verified through parallel combustion tests.Results demonstrated that microfluidically prepared B/KNO₃ propellants exhibited uniform component distribution,smaller particle sizes,a 104.5%increase in specific sur-face area compared to mechanically mixed samples,and a reduction in average combustion time from 80.67 ms to 64.33 ms(a 20.2%improvement).The synergistic effect of the thermal conductivity of graphene oxide combined with the catalytic activity of Fe₂O₃ significantly lowered the activation energy of the system,primary decomposition onset temperature,and exothermic peak temperature,further accelerating combustion rates.Optimal addition concentrations were determined as 0.8%graphene ox-ide and 2%Fe₂O₃,reducing the average combustion duration to 50.33 ms.