The invention discloses a preparation method of foam
metal, and belongs to the technical field of
porous metal preparation. The method comprises the following steps: forming a single-layer foam half-hole structure by a
metal sheet through a mold pressing process, and carrying out closed hole combination after surface treatment and functional material filling to form a single-layer foam structure; and the single-layer foam structures are stacked and combined in a three-dimensional space, and the foam
metal is obtained.
Metal sheets made of different materials are selected according to product purposes, and different types of molds are selected for die forming according to the shapes of the air holes and the materials of the metal sheets; different surface treatment processes or functional materials are selected for filling according to product purposes, and the single-layer foam structures are combined in a
welding mode, a riveting mode, a gluing mode, a high-temperature
sintering mode and the like. The size and shape of the air holes are effectively controlled through mold design, the process period is greatly shortened, functional material filling can be achieved in the air holes, and a single-layer foam half-hole structure can endow the foam metal with a new function through surface treatment.