Development of an Energetic Material Information Self-Destruction Microsystem Based on Bistable Off-On Actuator Composed of Fusible Alloy

The physical self-destruction of an information storage chip (ISC) driven by a detonation wave generated using energetic materials is an important method to ensure the security of key core information. To solve the related problems of high electrostatic sensitivity, poor overcurrent capability, and easy erroneous triggering, a bistable OFF- ON actuator (BO-OA)-based energetic material information self-destruction microsystem is proposed based on a fusible alloy. First, the BO-OA model based on the fusible alloy is constructed. By performing a finite element numerical analysis and experimenting, the response time of the Bi-Sn alloy with a continuous temperature rise from 22 °C to 138 °C is obtained. Second, a model of the energetic material dose and detonation wave transmission in an air domain is constructed. An analysis using LS-DYNA software indicates that copper azide can produce GPa-level stress waves in a millimeter-level air domain to realize ISC physical self-destruction. Finally, through bulk silicon processing and in situ reaction of the energetic materials, self-destruction module preparation and functional integration are realized. Experiments and simulations show that when driven by a 12 V electromotive force, the BO-OA reaches the fusible alloy melting point of 138 °C within$320 \mu \text{s}$and can realize electrical conduction within$33 \mu \text{s}$. 0.45 mg of copper azide can generate a 3.27 GPa detonation wave within$5.9 \mu \text{s}$at 0.3 mm in the air domain to realize the physical self-destruction of the ISC. This scheme can greatly improve the safety of the energetic materials and provides strong practical value for information self-destruction.