Properties of Composite Modified Double-based Propellant Containing CL-20

The physic-chemical properties,safety properties,combustion properties and inner ballistic properties of composite modified double-based propellant containing hexanitrohexaazaisowurtzitane(CL-20)(CL-20/CMDB) propellants were studied.Results show that the burning rate of CL-20/CMDB propellant is 2.5～8.94 mm·s-1 higher than that of RDX/CMDB propellant at 6～20 MPa.The pressure exponent of CL-20/CMDB propellant is greater,which is up to 0.28 at 10～20 MPa.CL-20/CMDB propellant has higher density,explosion heat and specific volume than that of RDX/CMDB propellant.The density,explosion heat and specific volume of CL-20/CMDB propellant is 1.76 g·cm-3,5034 J·g-1 and 658 L·kg-1,respectively.CL-20/CMDB propellant has the same chemical stability as RDX/CMDB propellant,lower impact sensitivity than RDX/CMDB propellant,but higher friction sensitivity,up to 100%;the specific impulse of CL-20/CMDB propellant can achieve 2226.1 N·s·kg-1(227 s) in Φ36 rocket motor.