ADN/AlH3 composite microsphere, preparation method and solid propellant containing microsphere

The invention relates to an ammonium dinitramide/aluminum trihydride (ADN/AlH3) composite microsphere, a preparation method thereof and a solid propellant containing the composite microsphere. The composite microsphere structurally comprises an ADN layer, a first reaction type protective layer, an AlH3 layer and a second reaction type protective layer from inside to outside in sequence, the structural performance is adjustable, the preparation process is simple, safe and stable, the requirements of scale-up production are met, and the microsphere is low in moisture absorption rate, low in mechanical sensitivity and wide in application prospect. The composite microsphere is suitable for different adhesive-curing systems, can be used in HTPB and GAP adhesive-isocyanate curing agent systems,can also be used in GAP adhesive-alkynyl curing agent systems, has excellent safety performance and patent medicine performance, can significantly improve the low characteristic signal performance ofsolid propellants, can be