What are the effects if different impurity elements are infiltrated into industrial aluminum?

by:Zeyi     2021-05-13
Vanadium forms vanadium 11 refractories in industrial aluminum, which plays an important refining role in the melting and casting process, but it is smaller than the grain refinement of titanium and zirconium. Vanadium can refine the recrystallization structure and increase the recrystallization temperature. The solid solubility of calcium in industrial aluminum profile is very low, and it forms a caal4 compound with aluminum. Calcium is the superplastic element of industrial aluminum. Calcium accounts for about 5%, and manganese aluminum alloy accounts for about 5%. Calcium and silicon form CASI and are insoluble in aluminum. Due to the decrease of silicon solid solution, the electrical conductivity of industrial pure aluminum has increased slightly. Calcium can improve the cutting performance of aluminum alloy. Casi2 cannot be used for heat treatment strengthening of industrial aluminum. A small amount of calcium is beneficial to the removal of hydrogen from the aluminum solution. Lead, tin, and bismuth are low-melting metals. Their solid solubility in aluminum is very small, the strength is slightly reduced, but can improve the cutting performance. The expansion of bismuth during solidification facilitates the filling and shrinking of bismuth. Adding bismuth to high-magnesium alloys can prevent the brittleness of sodium. Antimony is mainly used as a modifier in the aluminum casting industry, while wrought aluminum alloys are rarely used. Only bismuth is used in aluminum-magnesium deformed aluminum alloys to prevent the brittleness of sodium. In order to improve the hot pressing and cold pressing properties of the aluminum-zinc-magnesium-copper alloy, antimony is added to the aluminum-zinc-magnesium-copper alloy. Beryllium can improve the structure of the oxide film of the deformed aluminum alloy and reduce the combustion loss and inclusions. Beryllium is a toxic element that can cause allergic poisoning. Therefore, beryllium should not be included in food and beverages. The content of beryllium in welding materials is generally controlled below 8μg/ml, and the content of beryllium in aluminum alloy as the welding matrix should also be controlled below 8μg/ml. Sodium is almost insoluble in aluminum, and its solid solubility is greater than 0.0025%. Sodium has a low melting point (97.8 ). When the alloy contains sodium, it will be adsorbed on the surface of dendrites or grain boundaries during solidification. During the heat treatment process, sodium forms a liquid adsorption layer at the grain boundaries. When embrittlement occurs, naalsi compounds are formed. There is no free sodium and sodium brittleness;. When the magnesium content is greater than 2%, magnesium adsorbs silicon and precipitates free sodium, causing sodium embrittlement;. Therefore, sodium salt flux is not allowed in high-magnesium industrial aluminum. The way to prevent sodium embrittlement is chlorination. NaCl formed by sodium is discharged into the slag, bismuth is added to the metal matrix to form na2bi, and the addition of antimony to na3sb or rare earth can also play the same role.
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