The ability of the ceramic filters for cast aluminum to capture the inclusions is critical to keeping the ingot clean during the metal solidification process. Therefore, the quality and productivity of downstream operations (such as forging, extrusion, and rolling) are guaranteed. Impurities have a great influence on metal cleanliness. In order to obtain the best metal cleanliness, AdTech can provide molten aluminum purification systems, aluminum alloy additives, operating methods, metallurgical services, and support.
In the aluminum casting process, molten aluminum usually contains entrained solids, which are harmful to the final cast metal product. These entrained solids usually come from three sources. Some are alumina particles, which are sucked into the liquid stream from the floating oxide layer on their surface. Some of the entrained particles are fragments of the furnace lining, conveyor troughs, and other parts of the molten aluminum processing equipment, which are eroded and entrained in the flowing aluminum stream. Some particles are precipitates of insoluble impurities, such as intermetallic compounds, borides, carbides, or precipitates of other aluminum compounds, such as chlorides.
Ceramic filters for cast aluminum are used to remove entrained solids from molten aluminum alloys before casting. When the molten aluminum solidifies, when these inclusions appear in the final cast product, they will cause the final aluminum product to have reduced ductility or poor trimming properties. Therefore, it is important to remove the entrained solids from the molten aluminum before casting the molten aluminum into a solid.
The ceramic foam filter (CFF) produced by AdTech maintains high strength and has excellent resistance to chemical abrasion of castings. The network of pores in the filter provides a larger surface area for inclusions retention. The filter size range is 7, 15, 17, 23, 26 inches, and the pore size is 10 to 60 PPI. For high cleanliness requirements, a double filter with two pores can be used.