Low-porosity aluminum-magnesium-calcium rear earth based cellular Al alloy foam and preparation thereof

Abstract

The invention discloses a low porosity rate Al-Mg-Ca-rare-earth-based closed-cell foamed aluminum alloy and a preparation method which are a foamed aluminum alloy with good corrosion-resistant performance, high strength, high finished product rate, simple method and low cost and a preparation method. The foamed aluminum alloy takes calcium carbonate as a foaming agent, the porosity rate is between 40 and 75 percent, wherein, the manganese accounts for 1 to 11 percent (mass percentage) of the alloy, the calcium accounts for 0.5 to 5 percent (mass percentage) of the alloy, the rare earth accounts for 0.10 to 1.2 percent (mass percentage) of the alloy. The preparation method is that: the pure aluminum is heated up for melting, the melting body is added with the manganese equivalent to 1 to 11 percent of the mass of the alloy, the calcium equivalent to 0.5 to 5 percent of the mass of the alloy and the rare earth equivalent to 0.10 to 1.2 percent of the mass of the alloy, and kept for 10 to 30 minutes; the temperature of the melting body is ensured between 650 and 690 DEG C, the melting body is stirred for 2 to 12minutes with the speed of between 300 and 600rpm; the calcium carbonate equivalent to 0.5 to 5 percent of the mass of the pure aluminum is added into the melting body to stir so as to make the aluminum alloy melting body to be foamed, the low porosity rate Al-Mg-Ca-rare-earth-based closed-cell foamed aluminum alloy is obtained after cooling.

Description

technical field [0001] The invention relates to a foamed aluminum alloy and a preparation method thereof, in particular to a low-porosity aluminum-magnesium-calcium rare earth-based closed-cell foamed aluminum alloy and a preparation method thereof. Background technique [0002] Al-Mg-Ca rare earth-based foamed aluminum alloy not only has the functions of energy absorption, damping and vibration reduction, sound insulation, heat insulation, electromagnetic shielding and other functions that ordinary foamed aluminum has, but also has excellent corrosion resistance. It is used in aerospace, vehicles , marine industry and other fields have broad application prospects. The low-porosity aluminum-magnesium-calcium rare earth-based closed-cell foamed aluminum alloy has higher strength and has more important uses in high-tech fields. [0003] At present, the inventor has mastered the preparation process of Al-Mg-Ca rare-earth-based aluminum alloy foam, and successfully solved the p...

AI Technical Summary

Problems solved by technology

However, using the existing technology to prepare magnesium-calcium rare earth-based foamed aluminum alloys, titanium hydride is used for foaming, the pyrolysis speed is fast, the bubbles are formed rapidly, and it is easy to float, break or merge, and it is not easy to prepare foam products with low porosity and high strength.

Moreover, the hydrogen gas released by titanium hydride at high temperature is easy to burn, which intensifies the burning loss of magnesium.