Preparation method of sandwich board with aluminium alloy foam core

Abstract

The invention provides a preparation method of a sandwich board with an aluminium alloy foam core and belongs to the field of porous metal materials. According to the method, an aluminium alloy is melted, kept at the temperature and tackified, a foaming agent TiH2 subjected to pre-oxidation treatment is added to tackified aluminium alloy melt for stirring dispersion, after TiH2-containing tackified aluminium alloy melt is cooled and solidified, a solidified blank is obtained, a pure aluminium board and the solidified blank are subjected to composite hot-rolling, a composite board with the surface being a pure aluminium layer and the core being an aluminium alloy foamable precursor is obtained, then the composite board is heated to the temperature 10-30 DEG C higher than that of an aluminium alloy liquid phase line for heat-insulating foaming, and the sandwich board with the surface being a pure aluminium layer and the core being aluminium alloy foam is obtained after a foamed body is cooled.

Description

technical field [0001] The invention relates to a preparation method of an aluminum alloy foam core sandwich board, belonging to the field of porous metal materials. Background technique [0002] Aluminum foam core sandwich panel is a sandwich structure with pure aluminum or aluminum alloy solid layer on the surface and foam aluminum core. Compared with pure foam aluminum, it has higher specific strength and energy absorption capacity. It has broad application prospects in the fields of trains, airplanes, ships, and decorations. [0003] At present, the mainstream production methods of known aluminum foam core sandwich panels are bonding method and powder metallurgy foaming method. The bonding method uses organic glue to bond the foamed aluminum core and the aluminum (or aluminum alloy) panel together to obtain a foamed aluminum core sandwich panel; the powder metallurgy foaming method is firstly obtained through powder metallurgy (powder mixing, pressure processing) The f...

AI Technical Summary

Problems solved by technology

The disadvantage of the bonding method is that the bonding strength between the panel and the foam core is low, and the operating temperature generally does not exceed 200°C; although the powder metallurgy foaming method can obtain a high-strength aluminum foam sandwich panel in which the panel and the foam core are metallurgically bonded, Limited by the powder metallurgy method itself, there are obvious deficiencies in product cost, output and size

[0004] In order to obtain high-strength sandwich panels with a metallurgical combination of panels and foam cores at low cost, in large quantities, and in large sizes, the present invention proposes a method for preparing sandwich panels with aluminum alloy foam cores. Foamable precursors of agents, combined with TiH 2 Aluminum alloy foam core sandwich panels are prepared through the process of pretreatment, composite hot rolling and thermal insulation foaming, which overcomes the shortcomings of the powder metallurgy foaming method in the preparation of foam aluminum core sandwich panels in terms of cost, output and size.

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