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

Alpha-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.