AdTech provides a foam ceramic filter for aluminum casting, which has high thermal shock resistance, high corrosion resistance, sufficient strength, economical production, is more environmentally friendly than existing technologies, and has low density.
The ceramic foam material has an open-cell structure in which connected voids surrounded by a ceramic material mesh are distributed. This structure is usually used for molten metal filtration and is known as ceramic foam in the industry.
Features of Foam Ceramic Filter for Aluminum Casting
1. High thermal shock resistance-the material must not crack or peel off during preheating or contact with molten metal. The material should have a low coefficient of thermal expansion to minimize the transverse compressive stress when in the filter bowl.
2. Corrosion resistance: The filter material should not react significantly within the expected application range (time, temperature, alloy content), and must be kept from being wetted by molten aluminum and its common alloys.
3. Sufficient bending and compressive strength.
4. Production economy.
5. The used filter material must be safely handled and disposed of.
6. Low density or light weight, which is convenient for the operator of the casting pit.
The thermal expansion rate of the ceramic foam filter is in the range of 1.5-7.5×10-6mm/℃. Under normal conditions of use, the ceramic foam filter is proven to resist the chemical attack of molten aluminum alloy. The ceramic foam filter is light in weight and preferably has a density of about 0.25-0.40 g/cc.
Ceramic foam is a tough foam made from ceramics. Manufacturing techniques include impregnating open-cell polymer foams internally with ceramic slurry and then firing in a kiln, leaving only ceramic material. The foams may consist of several ceramic materials such as aluminum oxide, a common high-temperature ceramic, and gets insulating properties from the many tiny air-filled voids within the material.
Alumina Ceramic Foam Filters are mainly for the filtration of aluminum and alloys in foundries and cast houses. With the excellent resistance to attack and corrosion from molten aluminum, the filter can effectively remove inclusions, reduce trapped gas and provide laminar flow, and then the filtered metal is significantly cleaner. Cleaner metal results in higher-quality castings, less scrap, and fewer inclusion defects, all of which contribute to bottom-line profit.