Combustion Characteristics of CMDB Propellant Containing Mg/Al Mechanical Alloy

The thermal decomposition performances,flameout surface characteristics and condensed combustion products of composite modified double-base propellant(CMDB) containing reactive metals such as aluminum(Al) and magnesium/aluminum(Mg/Al) mechanical alloy were investigated by pressure differential scanning calorimetry(PDSC),scanning electron microscope(SEM),energy dispersive spectrometry(EDS) and quantitative X-ray diffraction analysis(XRD).The effect of Mg/Al mechanical alloy on the combustion mechanism was discussed.The combustion physical model of propellant was established.The results show that the substitution of Mg/Al mechanical alloy in propellant for Al powder makes the burning rate increase,pressure index decrease,combustion efficiency of Al increase,thermal decomposition sensitivity enhance,decomposition enthalpy decrease and the agglomerate of Al disappear.