Semi-continuous production process for closed-cell foamed aluminum

Abstract

The invention discloses a semi-continuous production process for closed-cell foamed aluminum. The semi-continuous production process comprises the following steps of assembling and preheating a composite mold, smelting a melt in a smelting furnace, quantitatively conveying the melt in the smelting furnace to a middle ladle by a vacuum lifting ladle, adding a tackifying component into the melt in the middle ladle, semi-continuously supplying the melt in the middle ladle into a transition crucible of the composite mold, adding a foaming agent into the transition crucible of the composite mold under stirring, separating the transition crucible in the composite mold from a filling mold, keeping the temperature of the filling mold into which the melt is filled and foaming, and cooling the filling mold in a fully-automatic cooling system after foaming is finished. The foamed aluminum can be semi-continuously produced, the labor intensity is reduced, a foamed aluminum product with super large specification can be also prepared, and furthermore, the consistency of the performance of the aluminum products can be effectively ensured.

Description

technical field [0001] The invention relates to a production process of foamed aluminum, in particular to a semi-continuous production process of closed-cell foamed aluminum. Background technique [0002] Aluminum foam is a kind of composite material with a large number of bubbles inside and the bubbles are distributed in the continuous metal phase to form a pore structure. It organically combines the metal characteristics of the continuous phase aluminum and the pore characteristics of the dispersed phase pores, making it unique. The characteristics of light density, good energy absorption performance, unique acoustic and thermal performance, and excellent electromagnetic shielding also make it have great application potential in the fields of construction, rail transit, machinery manufacturing, and aerospace. At present, large-scale industrial production prepares closed The method of porous aluminum foam is the melt foaming method. The melt foaming method has the advantag...

AI Technical Summary

Problems solved by technology

Although the existing process is simple, it also has the following deficiencies: (1) It is difficult to effectively guarantee the consistency of the performance of the obtained product

This is because there are multiple pouring operations in the process, and once the temperature, time and other parameters in the process are controlled differently, it will inevitably lead to differences in the properties of the foamed aluminum products.

(2) It is difficult to operate precisely

TiH as described in US.pat.3743353 2 When used as a foaming agent to prepare aluminum foam, the stirring and foaming time should be controlled within 1 to 2 minutes, but the viscosity of the melt with the thickening component and the foaming agent is relatively high, resulting in poor fluidity, and it is easy to be difficult to pour during the pouring process. and other problems, which eventually lead to performance differences between different batches of products

(3) It can only be operated intermittently. The method described in CN1320710A has improved the foreign patent, which greatly reduces the difficulty of foamed aluminum operation, but this method belongs to intermittent operation; it is difficult to prepare large-scale foamed aluminum products

The main reason here is still that pouring cannot take too long, and large-sized aluminum foam products require a large amount of aluminum liquid, and the pouring process takes a long time. If the pouring time is too long, it will inevitably lead to the need to pour aluminum liquid later. The fluidity is poor, and solidification may occur; (4) When the control is improper, a solid body with a certain thickness will appear at the bottom of the foam, and the distribution of the foam in the foam is uneven; (5) In order to solve the problem of gap aluminum foam production High cost authority, US patent US.pat6984356B2 and Chinese patent ZL200610032465.0 respectively describe a continuous preparation method and continuous foaming equipment for aluminum foam. Although these two patents can achieve low-cost continuous production of aluminum foam, it is difficult Prepare super-sized aluminum foam products

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