CO2氛围下Mg对nAl着火及燃烧过程的影响OA

Aluminum(Al)and magnesium(Mg)are widely used in solid propellants for aerospace en-gines.However,Al readily forms alumina(Al2O3)during combustion in air,creating a film on the particle surface that severely hinders mixing between fuel particles and oxidizer,leading to incomplete combustion.In-situ resource utilization(ISRU)is considered a critical technology for space exploration programs.Uti-lizing the abundant CO2 in the Martian atmosphere as a power source for aerospace engines holds signifi-cant importance for reducing the costs of deep-space exploration.In this study,thermogravimetric analysis(TGA)and combustion experiments were conducted to investigate the thermal weight gain and combustion processes of Mg-blended nano-aluminum(nAl)mixed samples in a CO2 atmosphere;the microstructure and crystal structure of combustion products were analyzed using X-ray diffraction(XRD),scanning elec-tron microscopy(SEM),and energy-dispersive spectroscopy(EDS)to elucidate the regulatory mechanism of Mg on nAl combustion.The results showed that nAl and Mg exhibited significantly distinct combustion behaviors when burned individually.Blending 20%-30%Mg significantly improved the ignition perfor-mance of nAl,reducing its ignition delay time by 47.88%and increasing its combustion duration by 51.47%.However,Mg blending showed no significant promoting effect on the slow oxidation process of nAl.A weak synergistic effect was only observed within the temperature range of 800℃to 860℃and when the Mg blending ratio exceeded 30%,whereas mutual inhibition dominated under other conditions.Further-more,the agglomeration phenomenon of combustion products was not alleviated by Mg blending,suggest-ing that the regulatory effect of Mg on nAl combustion has inherent limitations.