| Autor: |
Kovtunov, A. I., Khokhlov, Yu. Yu., Myamin, S. V., Semistenova, T. V. |
| Zdroj: |
Steel in Translation; Jul2023, Vol. 53 Issue 7, p599-604, 6p |
| Abstrakt: |
Foam aluminum is a promising material with a unique combination of mechanical and operational properties: low specific gravity, low thermal conductivity, the ability to absorb acoustic and electromagnetic oscillations, and the ability to deform under constant load. At present, the most used methods for producing aluminum foam are methods based on mixing a gas or blowing agent (porophore) into the aluminum melt and forming a porous structure during the aluminum melt solidification. An alternative to this technology is the formation of a porous structure through the use of soluble granules, which are pre-filled in the mold, and then, after the granules are impregnated with aluminum melt and the casting is solidified, they are leached. Studies of porous aluminum formation processes carried out by impregnation of a mold with soluble granules with an aluminum melt confirmed that the melt cooling rate depends on the thermal casting conditions (the mold temperature with granules and the poured alloy temperature), as well as on the size of water-soluble granules, their thermophysical properties and their packing density in the mold. Calculation and experimental studies have shown that the melt cooling rate in a mold with water-soluble granules is 1.8–10 times higher than when casting off solid aluminum castings. Porous aluminum structure metallographic studies have shown that the grain size is 2–4 times smaller than that of solid castings. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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