Research on Interface Adhesive Modification of Ionic Liquids in Electrically Controlled Solid Rocket Motors

To address the bonding failure issue at the propellant/metal interface in electrically controlled solid rocket motors, this study investigated the bonding modification effect of ionic liquids at both metal/metal and propellant/metal interfaces. The adhesion strength of the metal/metal interface was evaluated using flatwise tensile shear tests, while the bonding strength of the propellant/metal interface was assessed via 180° peel tests. This study revealed the influence of metal material type, temperature, and time on the bonding performance of metal/metal interfaces and clarified the peel evolution process at the propellant/metal interface. The results indicate: (1) the adhesion strength of the copper/copper interface is significantly affected by temperature, achieving effective bonding only at elevated temperatures; (2) The stainless steel/stainless steel interface can achieve effective bonding at lower temperatures, with interfacial bonding strength exceeding 1 MPa; (3) The adhesion strength of the aluminum/aluminum interface is generally weak; (4) The interfacial adhesion strength for the propellant/metal interface reached 5.47 MPa, and the interfacial peel process can be divided into a loading stage and an unloading stage. These findings provide technical support for interface modification in electrically controlled solid rocket motors.