Foamed aluminium material

Abstract

The invention discloses a foamed aluminum material. The foamed aluminum material is prepared by a particle infiltration method. The preparation method is as follows: the filling material consists of 80% to 92% of kaolin, 3% to 7% of white carbon black, 4% to 9% % of expansive soil and 1% to 4% of calcium carbonate, by weight, use a granulator to make the filler into a spheroid, and dry the spheroid naturally or at low temperature; preheat the mold and the spheroid , the preheating temperature is 550 ℃ ~ 650 ℃, which is close to the temperature to be infiltrated into the molten aluminum; infiltrate the molten aluminum into the gap of the spheroid at 8 ~ 45 × 106 Pa; after cooling, take out the casting and use a The spheroids are washed with an aqueous solution, after which aluminum foam is obtained. The aluminum foam material of the invention has both independent cells and continuous cells, has a strong sound-absorbing effect, the formed holes are uniform in size, beautiful in appearance, and can save preparation cost and energy consumption.

Description

technical field [0001] The invention relates to a foamed aluminum material, in particular to a continuous and independent foamed aluminum material. Background technique [0002] Metal foam is a new type of functional material, and its invention has only a history of more than 40 years. Until today, the United States, Japan, Germany, the United Kingdom, Canada and other countries have successively developed a variety of methods for producing foamed aluminum. But so far, according to the foaming form of aluminum foam in various countries, aluminum foam materials are generally divided into two types of bubbles, one is the independent existence of bubbles, which is called independent bubble type, also called closed cell type. The other is that the bubbles are in a continuous state, which is called continuous bubble type, also called open cell type. [0003] Independent foamed aluminum materials are produced using hydride as a foaming agent. Its problems are: the independent b...

AI Technical Summary

Problems solved by technology

Its problems are: the independent bubbles produced by the independent bubble type have very few holes connecting the bubbles in the casting body, the natural absorption volume is poor, there will be a large number of semicircular bodies on the surface, and there are many sound resistance. phenomenon, and the hydride blowing agent is difficult to stir evenly in the metal aluminum liquid

Its disadvantage is that due to the appearance shape and production method of the salt particles, independent bubbles cannot be formed at all

The use of this material is limited by the shape of the foam

In addition, salt particles are used as fillers, and industrial salt is highly corrosive, resulting in poor hardness and bending resistance of foamed aluminum.

Because the particle infiltration method is used in production, the temperature of the infiltrated aluminum liquid should be kept close to that of the salt particles, and the salt particles need to be preheated. Since the salt particles themselves have a large amount of water, they are easy to harden during preheating, and the salt powder will appear. , which greatly affects the quality and quantity of

And when the salt particles are preheated, it takes a long time to remove the moisture of the salt first, and then heat up and preheat before it can be implemented, which invisibly increases the consumption of energy