Ceramic Foam Filters for Metal Casting are currently the most effective way to remove inclusions in the aluminum melt. In recent years, some new technologies for purifying molten aluminum in domestic and foreign research plants, such as vacuum dynamic processing, ultrasonic continuous degassing purification, and corundum ceramic filters, have received very good results, but these process methods are more complicated and costly. It is difficult to widely promote in the industry. The metal filter cloth used by low-end customers can only remove the large inclusions in the aluminum alloy melt, but the inclusions below the micron level cannot be removed, and the metal filter will also pollute the aluminum alloy. The use of foam ceramic filter plates can filter out small inclusions and significantly improve the mechanical properties and appearance quality of the product.
The Ceramic Foam Filters for Metal Casting is installed in the CFF filter box between the furnace mouth and the shunt plate. The closer the filter box is to the distributing launder, the better. The reason is that this can shorten the flow distance of the molten aluminum after filtration and reduce or avoid the re-generation of oxidation. The molten aluminum flows from the furnace mouth through the filter box, and then flows into the splitter plate through the launder. When the filter device is started, the drop before and after the melt filtration is about 30mm. With the extension of the filtration time, the inclusions on the surface of the filter plate and the hole wall increase, the filter flow decreases, and the difference between front and back increases. When the casting is completed, the drop increases to 50-100rm.
The selection of the ceramic foam filter first depends on the filtration accuracy. Generally, a pore size of 10 holes/cm can meet the requirements of aluminum liquid purification. If the aluminum liquid is particularly dirty, use 6 holes/cm large pore aluminum sheets for pre-filtration to prevent fine-pore filtration the tablets jam prematurely. The second is to determine the large area of the filter according to the casting speed and the metal flow rate per unit time.
Ceramic Foam Filters for Metal Casting Characteristics
- The mesh is uniform to ensure free penetration of the ceramic slurry and uniform coating.
- Hydrophilic, can firmly adsorb the slurry.
- It has enough elasticity and can quickly return to the original shape after extrusion.
- It is volatile at medium temperature and below the firing temperature of ceramics, and will not pollute the ceramics.