A high-efficiency continuous casting method for closed-cell aluminum foam ingot with controllable structure

Abstract

The invention discloses a high-efficiency continuous casting method for a closed-cell foamed aluminum ingot with a controllable structure, which belongs to the technical field of continuous preparation of porous metals. This method achieves the decomposition control of the foaming agent in the melt by changing the treatment method of the foaming agent. The continuous production not only greatly improves the production efficiency, but also solves the problem of no foam layer in the static casting. The pouring temperature, pouring speed and cooling intensity realize the continuous production of closed-cell aluminum foam ingots. This method controls the size and shape of the bubbles in the aluminum matrix by adding foaming agents of different types, different amounts, different particle sizes, and different pretreatments. The control method of the pore structure has higher feasibility and is more in line with reality. Requirements for product diversity in applications. The method is simple in process and low in cost, realizes continuous casting, greatly improves production efficiency, and is more in line with industrial requirements. The method can continuously prepare large-sized closed-cell foamed aluminum ingots with high efficiency.

Description

Technical field [0001] The present invention involves an efficient and continuous casting method of a controllable structure with closed foam aluminum ingots, which is a porous metal continuous preparation technology field. Background technique [0002] Foam aluminum has excellent performance such as ultra -low density, high ratio strength / ratio, and sound absorption, impact resistance, flame retardant, electromagnetic shielding and other excellent performance.Fields can also be used as functional materials in highway sound insulation, building noise reduction, and electromagnetic wave protection of electronic instruments.At present, the commonly used methods of preparing foam aluminum include infiltration casting method, melting mold casting method, electrolytic deposition method, solid gas co -crystallization solidification method, powder metallurgy method, gas injection foaming method, melt foaming method, etc. [0003] Among them, the osmotic casting method, the melting mold ...

AI Technical Summary

Problems solved by technology

U.S. Patent US.pat.3743353 described with TiH 2 When used as a foaming agent to prepare foamed aluminum, the stirring and foaming time is required to be controlled within 1 to 2 minutes, which greatly increases the difficulty of the preparation operation, and the feasibility of applying it to continuous casting is poor;

[0010] (2) There is no bubble layer in static casting

At present, in static casting, there will be a solid body with a certain thickness at the bottom of the foam. Although the non-foaming layer at the bottom can be reduced by adding a wetting agent such as Mg, it cannot be completely eliminated;

[0011] (3) Currently available equipment and processes are complex and difficult to operate

Although this patent realizes semi-continuous casting of aluminum foam prepared by melt foaming method, its equipment structure and process are still very complicated. Although it improves production efficiency to a certain extent, it is still not as high as the continuous casting method;

[0012] (4) It can only be operated intermittently, not continuous casting in the true sense

The method described in the Chinese patent CN1320710A improves foreign patents, which reduces the difficulty of foamed aluminum operation, but this method belongs to gap operation, the efficiency is not high, and it is difficult to prepare large-scale foamed aluminum products;

[0013] (5) Different batches of products are difficult to guarantee stable quality

U.S. Patent US.pat6984356B2 and Chinese Patent ZL200610032465.0 respectively describe a continuous preparation method and continuous foaming equipment for foamed aluminum. Although these two patents can realize low-cost continuous production of foamed aluminum, it is difficult to prepare large-scale Aluminum foam products

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