Daiki Aluminium Japan Ceramic Foam Filter fine inclusions are distributed in the molten metal, which increases the inhalation tendency and viscosity of the melt, thereby reducing the alloy’s ability to feed shrinkage and easily forming shrinkage cavities or porosity.
Among them, the content, shape and distribution of inclusions in the alloy are important factors that affect its plasticity.
Large-particle inclusions will make the ingot structure discontinuous, reduce the air tightness of the material, become the source of corrosion, and often become the source of cracks in the processing process, significantly reducing the strength and plasticity of the material.
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Process engineers believe that some of the inclusions in the aluminum alloy come directly from the charge, most of which are formed during the melting and pouring process, mainly oxide inclusions.
All inclusions before casting are called primary oxidation inclusions.
According to the size, it can be divided into two categories:
1. Large inclusions are unevenly distributed in the macrostructure, which makes the alloy structure discontinuous, reduces the compactness of the casting, and becomes a source of corrosion and cracks, thereby greatly reducing the strength and plasticity of the alloy.
2. The small and scattered inclusions cannot be completely removed after refining. They increase the viscosity of molten metal and reduce the feeding capacity of molten aluminum during solidification.
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The secondary oxidation inclusions are mainly formed during the casting process. During the pouring process, the molten aluminum contacts the air, and the oxygen reacts with the aluminum to form oxide inclusions.
During the smelting process, the aluminum alloy comes into contact with various components in the furnace gas to produce compounds such as AL2O3. The Al2O3 in the molten aluminum will increase the hydrogen content in the molten aluminum. Therefore, the content of Al2O3 in molten aluminum has a great influence on the formation of pores in aluminum castings.
In this way, the aluminum degassing manufacturer Adtech explained the cause of H in the aluminum melt.
Hydrogen can be burned in a gas furnace to introduce the condensate, flux and alloy additives on the tool into the molten aluminum.
However, it is most common to introduce hydrogen into molten aluminum through atmospheric humidity. The solubility of hydrogen increases with the relative humidity of the atmosphere.
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