Decomposition and combustion of HTPB-based composite propellants containing intercalated HMX crystals with desired high energy but low burn rate

•Composite propellants (CPs) containing insensitive high-energy qy-HMX have been prepared.•The qy-HMX-based CPs has 9.64% higher heat of explosion than HMX-based one.•The burn rate of CPs containing qy-HMX is 4.38 mm·s−1 at 3 MPa, 45.9% lower than that of corresponding HMX-based one.•The average particle size of the CCPs of qy-HMX-based CPs is 71.5% lower than that of HMX-based one.