Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH3 Composites by Solvent/Anti‐solvent Method

Abstract

AbstractAlpha‐aluminum hydride (α‐AlH3) is an ideal energetic combustion agent, but its poor stability and safety limit its application. Therefore, we prepare different composites by using the solvent/anti‐solvent method to coat different pyrotechnic binders on the surface of α‐AlH3. The vacuum stability test show that the minimum outgassing of Shellac‐coated α‐AlH3 composite is only 1.2 mL/g at 50 °C for 6 days. Due to the good electrical insulation properties of Viton, Viton‐coated α‐AlH3 composite have the highest E50 value of electrostatic sensitivity. In addition, the pyrotechnic binders coating not only protects the activity of the α‐AlH3 but also effectively increases its burning rate. Viton‐coated α‐AlH3 composite have more gaseous products and maximum flame area during combustion. This study illustrates that α‐AlH3 coated with pyrotechnic binders is a means to address its stability and safety, laying the foundation for its application in solid propellants.