Foaming method for preparing metal foam by powder metallurgy

Abstract

The invention provides a foaming method for preparing the foam metal through a powder metallurgy method. The foaming method comprises the following steps that the metal powder or the alloy powder is mixed with the foaming agent to obtain a core-layer mixture; the core-layer mixture is pressed to form a foaming precursor; the foaming precursor is placed in a foaming mold; the foaming mold is put into a foaming furnace for foaming, wherein the foaming mold comprises a top cover and a base, the top cover is in a concave shape and is provided with a first flat plate which is horizontally arranged,a first side wall which is vertically arranged, a limiting part which protrudes out of the outer surface of the first side wall and a first rib which protrudes out of the upper surface of the first flat plate; the edge of the first flat plate is connected with the lower edge of the first side wall; the base comprises a second flat plate which is horizontally arranged, a second side wall which isvertically arranged and a second rib which protrudes out of the lower surface of the second flat plate; the lower edge of the second side wall is connected with the second flat plate, and the second side wall at least partially surrounds the second flat plate and forms a cavity together with the second flat plate; and the first side wall and the first flat plate can be placed in the cavity, the first side wall is in contact with the second side wall, the upper edge of the second side wall is in contact with the limiting part, so that the top cover and the base form a foaming cavity together, and the foaming precursor is arranged in the foaming cavity.

Description

technical field [0001] The invention relates to the field of metal foam, in particular to a foaming method for preparing metal foam by powder metallurgy. Background technique [0002] Aluminum foam sandwich structure is a porous structure functional material with excellent physical and mechanical properties, such as light weight, energy absorption, shock absorption, cushioning, sound insulation and sound absorption, heat insulation, electromagnetic shielding, etc.; it can meet the requirements of system weight reduction, Structural bearing and functional integration and other performance requirements meet the requirements of future aerospace, automobile manufacturing, rail transit and other fields for structural and functional materials, and have broad development and application prospects. [0003] At present, the aluminum foam sandwich structure is mainly prepared by the bonding / welding method and the powder metallurgy method. Compared with the two, the bonding / welding met...

AI Technical Summary

Problems solved by technology

[0004] However, the mechanical properties of large-size aluminum foam sandwich structures prepared by traditional foaming processes are still insufficient.

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