Over the years, it has been steadily developing towards the use of finer pore ceramic foam filters to provide higher melt cleanliness, which is a requirement for the continuous improvement of the quality of aluminum processed products.
For example, in the application of aluminum can body panels, 40 and 50 holes per inch (PPI) foam filters are now commonly used in panel production.
In addition, a finer pore filter is currently being evaluated.
However, the use of finer pore filters requires a lot of pretreatment to reduce the level of inclusions and prevent the filter from clogging prematurely or blocked by residual inclusions.
Solid particles such as oxides, carbides, nitrides, and borax compounds present in metals (such as aluminum) and insoluble inclusions in liquids (such as molten salts) will significantly affect the plasticity and the final metal during rolling or extrusion deformation. Surface Quality.