Iron-based double-layer sintered material and preparation method thereof

The invention discloses an iron-based double-layer sintered material and a preparation method thereof.The iron-based double-layer sintered material comprises a base layer and a surface layer, and the preparation method of the iron-based double-layer sintered material comprises the following steps that surface layer powder and base layer powder are prepared respectively, and the copper content in the surface layer powder is larger than that in the base layer powder; the method comprises the following steps: firstly, filling surface layer powder into a mold cavity, and paving; then the mold cavity filled with the surface layer powder is filled with the matrix layer powder, and the matrix layer powder is laid flat; then carrying out compression molding to prepare a pressed blank; and the pressed blank is placed in heating equipment to be sintered, and the iron-based double-layer sintered material is obtained. The copper content of the surface layer powder is controlled to be larger than the copper content of the