High-impact-toughness foamed aluminum based on A356 aluminum alloy and production process of high-impact-toughness foamed aluminum

Abstract

The invention relates to a foamed aluminum material, in particular to high-impact-toughness foamed aluminum based on A356 aluminum alloy and a production process of the high-impact-toughness foamed aluminum. The production process comprises the steps that (1) 12-20 parts, by weight, of a foaming agent is ground and screened through a sieve with 100-180 meshes; (2) 100 parts, by weight, of A356 aluminum alloy ingots are crushed, ground into particles and then evenly mixed with 8-15 parts, by weight, of inorganic nano-whiskers and 10-12 parts, by weight, carbon nano-tubes, then a mixture is placed into a smelting furnace and completely molten in an inert gas atmosphere, afterwards, the foaming agent is sucked in to the smelting furnace under negative pressure, and a molten aluminum mixture is obtained after uniform mixing; (3) the molten aluminum mixture obtained in the step (2) is poured into a mold, the mold is then pushed into a foaming furnace, and heat preservation is conducted for1-2h at the temperature of 680-700 DEG C; and (4) the mold enters a cooling system to be cooled, and thus the foamed aluminum is obtained. According to the high-impact-toughness foamed aluminum basedon the A356 aluminum alloy and the production process of the high-impact-toughness foamed aluminum, the mixture of the inorganic nano-whiskers and the carbon nano-tubes is added in the forming processof the foamed aluminum, and thus the impact toughness of the aluminum is remarkably improved.

Description

technical field [0001] The invention relates to a foamed aluminum material, in particular to a foamed aluminum with high impact toughness based on A356 aluminum alloy and a production process thereof. 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, which makes it have the characteristics of light density, good energy absorption performance, unique acoustic and thermal performance, and excellent electromagnetic shielding. It has huge application potential in the fields of construction, rail transit, machinery manufacturing and aerospace. The current large-scale industrial production method for preparing closed-cell aluminum foam is the melt foaming method. The melt foaming method ha...

AI Technical Summary

Problems solved by technology

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

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

The high melt viscosity of the added tackifier and foaming agent leads to poor fluidity, and it is prone to problems such as pouring difficulties during the pouring process, which eventually leads to performance differences between different batches of products

(3) It can only be operated intermittently. (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; more importantly, due to the existence of the cell structure, The existing foamed aluminum has poor impact toughness