Production of foamed aluminosilicate alloy material with controllable density and aperture

Abstract

The invention has provided a method to produce the foamed aluminium-silicon alloy which can control the density and the aperture. The method is: first to heat the 20-45 um blister at 400-450 deg.C, then to mlt the aluminium-silicon alloy and add 3-5% Al powder, next cooling the composite fusant to 600-620 deg.C and adding into 1-3% blister, last to rise the temperature to 650-680 deg.C. So when it cool, we can get the material. We can get the different density and aperture foamed aluminium-silicon alloy by changing the content of Al powder blister and cotnrolling the temperature of fusant or foaming.

Description

technical field [0001] The invention relates to a preparation method of metal foam aluminum. Background technique [0002] Aluminum foam and its alloy materials are a new type of engineering material that has developed rapidly in the past ten years and integrates functions and structures. Foamed aluminum and its alloy materials, as structural materials, have the characteristics of light weight and high specific strength; as a functional material, they have multiple functions such as damping and vibration reduction, sound absorption and noise reduction, and impact energy absorption. Structural strength makes up for the lack of mechanical properties of traditional functional materials. [0003] At present, aluminum foam and its alloy materials are more and more widely used. Aluminum foam and its alloy materials with different pore sizes and densities have different properties in terms of energy absorption, sound absorption, sound insulation, shock absorption, fire prevention...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ①The viscosity of the aluminum liquid is too low, and the gas generated by the blowing agent is not easy to stabilize in the molten aluminum, and it is easy to escape or merge, resulting in low and uneven porosity of the foamed aluminum product

②The molten aluminum temperature is higher, and the TiH 2 Add directly to the melt for rapid stirring and mixing, then within 10-30s, TiH 2 Decomposes rapidly, causing rapid volume expansion of the melt, making mixing difficult

③The pore size of the product cannot be controlled

However, these methods often have the following disadvantages: ① When using gas to increase viscosity, the operation is inconvenient and the equipment is complicated; ② When Ca, Mg, etc. are used to increase viscosity, usually the amount of Ca added is 1 to 4% of the total amount of the melt , often causes pollution of the metal matrix, which adversely affects the performance of foamed aluminum, and this type of active tackifier is easy to oxidize and burn when the temperature is high during the stirring process, and is difficult to control; ③Use SiC, Si 3 N 4 or Al 2 o 3 When the viscosity is increased, it is difficult to mix evenly in the aluminum liquid because it is inconsistent with the base metal and has a large difference in specific gravity.

For example, when SiC is thickened, the specific gravity is large, it sinks quickly in the aluminum liquid and it is difficult to mix evenly, and the dosage is also large, up to 5-10%; ④ In terms of foaming agent treatment, when using the coating method, The process is more complicated