Influence of Composite Catalyst on Stability of Al/HMX/CMDB Propellant

After placing the Al/HMX/CMDB propellant samples containing composite catalysts for 3~4 weeks,their detonation heat and burning rate decrease,and pressure exponent increases. In order to find the exact reason,the combustion performance,vacuum stability and DSC thermal decomposition behavior of the propellant samples were tested. And the experimental results were systematically analyzed. The results show that the ultrafine SnO2 in the composite catalysts has strong catalytic activity,it can catalyse the thermal decomposition of the propellant at normal temperature,and finally results in the stability,detonation heat and burning rate of the propellants decreasing and the pressure exponent increasing. The deterioration of the propellant performance seriously affects the normal applications of the propellants.