The ceramic foam filter for casting can remove these impurities from the molten aluminum during the aluminum casting process. Generally, filtering molten metals, especially aluminum, poses special problems because liquids are very corrosive and it is difficult to find filter media that can withstand liquids. Typically, these Alu casting filters are made of ceramic materials to withstand the high temperatures associated with molten aluminum.
In fact, 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, the floating oxide layer on the surface sucks them into the liquid stream, and some of the entrained particles are fragments of the furnace lining, conveying trough and other parts of the molten aluminum processing equipment, which are eroded and entrained in the furnace. In the flowing aluminum stream, some particles are precipitates of insoluble impurities, such as intermetallic compounds, borides, carbides, or other aluminum compounds (such as chlorides).
When these impurities appear in the final cast product after the molten aluminum has solidified, they can cause the ductility of the final product to decrease or the finishing characteristics of the final product to be poor. Therefore, it is desirable to remove entrained solids from the molten aluminum stream before casting the molten aluminum stream into a solid, which can be used as it is or subjected to forming operations such as rolling, forging, extrusion.
Alumina ceramic foam filters are mainly used for filtering aluminum and alloys in foundries. Due to its excellent resistance to corrosion and corrosion by molten aluminum, the filter can effectively remove inclusions, reduce residual gas and provide laminar flow, and then filter the filtered metal. Cleaner metal can make castings with higher quality and more waste. Fewer and fewer inclusions, all of which help increase profits.
Performance of Alu Casting Filters
- The Alu filter can work at a temperature of 1200 degrees Celsius.
- It is highly porous and helps to absorb molten metal, leaving behind impurities.
- Has high thermal shock resistance.
- Has higher physical and chemical stability.
The manufacture of alumina ceramic foam filters involves different industries, such as non-ferrous metals and oxidized aluminum alloys, high-temperature gas filters, chemical fillers and catalytic carriers. It is manufactured in different shapes and sizes.
The entire range of porosity is from PPI 10 to PPI 60 (PPI = number of holes per inch).
Filters have all the following common sizes: 7x7x2″, 9x9x2″, 12x12x2″, 15x15x2″, 17x17x2″, 20x20x2″, 23x23x2″. Other sizes can be customized according to requirements.