Al (at) M (at) Al composite aluminum powder and preparation method thereof

The invention discloses Al (at) M (at) Al composite aluminum powder and a preparation method thereof. The Al-M-Al composite aluminum powder is aluminum-bimetal-aluminum sandwich structure composite aluminum powder, an inner core is aluminum powder, a sandwich layer is a 5-20 nm copper, iron or nickel coating layer, a shell is a 1-2 [mu] m aluminum elementary substance film, the surface of the aluminum powder is coated with a layer of copper, iron or nickel through a chemical reduction method, and then a layer of aluminum elementary substance film is deposited through a magnetron sputtering method. The particle size of the Al-M-Al composite aluminum powder is only increased by 1-2 microns compared with that of original aluminum powder, the reaction completion rate of the aluminum powder is obviously increased, and the combustion heat value is obviously higher than that of M-Al powder of a core-shell structure. 本发明公开了一种Al@M@Al复合铝粉及其制备方法。所述的Al@M@Al复合铝粉为"铝-二金属-铝"夹心结构复合铝粉，内核为铝粉，夹心层为5~20nm的铜、铁或镍包覆层，外壳为1~2μm的铝单质薄膜，先