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  • 发布日期:2018/09/03
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铝合金型材喷涂生产线

尽管固态氧化铝的密度近似于铝熔体的密度,在进入铝熔体内部后,经过足够长的时间才会沉至坩埚底陪。而铝熔体被氧化后形成的氧化铝膜,却仅与铝熔体接触的一面是致密的,与空气接触的一面疏松且有大量直径为60--100A的小孔,其表面积大,吸附性强,极易吸附在水汽,反有上浮的倾向。因此,在这种氧化膜与铝熔体的比重差小,将其混入熔体中,浮沉速度很慢,难以从熔体中排除,在铸件中形成气孔太夹杂。所以,转送铝熔体中关键是尽量减少熔融金属的搅拌,尽量减少熔体与空气的接触。

Although the density of solid alumina is similar to that of aluminum melt, it takes a long enough time to sink to the bottom of the crucible after entering the inner part of the aluminum melt. However, the alumina film formed by oxidation of aluminium melt is compact only on the one side which contacts with aluminium melt. The one side which contacts with air is loose and has a large number of pores with diameters of 60-100A. Its surface area is large and its adsorption is strong. It is easy to adsorb water vapor and has the tendency to float. Therefore, the specific gravity difference between the oxide film and the aluminum melt is small, and when the oxide film is mixed into the melt, the floating and sinking speed is very slow, so it is difficult to remove from the melt, and the porosity is too inclusion in the casting. Therefore, the key to transfer the aluminum melt is to minimize the stirring of the molten metal and to minimize the contact between the melt and the air.

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关键词:铝合金型材喷涂生产线,铝及铝合金管材生产,铝合金锭生产

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