Ceramic foam filter is used in the production and processing of molten aluminium and other metals. AdTech specially designed Ceramic Foam Filters are made of the basic raw material Aluminium Oxide. They are manufactured with porosities varying from 20 to 60 pores per inch (PPI). Also, combo sets are made in 20-30 PPI and other selections are possible. Different sizes and custom-made filters are manufactured according to specifications.
Molten aluminium usually has to be filtered before it is cast. The filtration process removes particles that could otherwise cause rejects in the final products.
Traditionally, ceramic foam filters are used. These are made from alumina refractory slurry by impregnating a reticulated foam manufactured to a specific porosity with the slurry. The impregnated foam is then dried and fired in a kiln. The foam burns off leaving a porous ceramic body, which is used as the filter. Ceramic filters come in various sizes, typically 7″, 9″, 12″, 15″, 17″, 20″, 23″ and 26″ wide, and 2″ thick (16 cm, 20 cm, 27 cm, 34 cm, 38 cm, 45 cm, 52 cm and 58 cm wide, and 5 cm thick).
For use, the alumina ceramic foam filter is mounted in a refractory filter bowl. Liquid aluminium is poured into the bowl through the filter, which traps fine particles in the liquid metal. When the casting operation is complete, the aluminium remaining within the ceramic filter freezes, forming a block of virtually solid aluminium.
The ceramic foam filter is a bonded ceramic foam material with an open-cell structure, which is characterized in that a plurality of interconnected voids are surrounded by a ceramic mesh. Naturally, the ceramic foam can have any desired configuration based on the configuration required for a particular molten metal filtration process. Although these configurations can naturally be varied, a specific configuration may be preferable for filtering in the conveying trough between the furnace and the mold when filtering the molten aluminum.
Our molten aluminium ceramic foam filter uses good portiforium foam and high purity ceramic as raw material, can remove non-metal solid mixture from molten aluminum and aluminium alloy effectively in your aluminium casting industry.