Influence of Combustion Stabilizers on the Thermal Decomposition Characteristics of RDX-CMDB Propellant

The effects of five combustion stabilizers including Al2O3,ZrB2,ZrO2,SiC and WC on the thermal decomposition characteristics and the combustion wave temperatures of RDX-CMDB propellant were studied by PDSC and Π mode miniature W/Rt thermocouples.The results show that as pressure increasing,the two decomposition peak temperatures in RDX-CMDB propellant decrease and the decomposition heat increases.Under the same pressure,the influence of the five combustion stabilizers on the two decomposition peak temperatures is inconspicuous,and the influence on the decomposition heat is obvious.The influence of ZrO2 and WC is the most obviously,and the decomposition heat can be enhanced more than 28 percent at the pressure of 5 MPa.The influence of Al2O3 is slightly apparent and the influence of ZrB2 and SiC is unapparent.The combustion positions of the five combustion stabilizers acting on the RDX-CMDB propellant are different.The ZrO2 and WC stabilizers mainly act on the condense phase reaction zone and fizz zone of RDX-CMDB propellant,while the Al2O3 stabilizer acts on the gas phase zone of RDX-CMDB propellants.