Working Principle of Foam Ceramic Filters

The core working principle of foam ceramic filters lies in their unique three-dimensional interconnected curved-pore mesh skeleton structure, with an open porosity of 80%-90%. This high porosity structure allows them to filter and purify molten metal primarily through the following three mechanisms:

● Mechanical interception (sieving) mechanism: Molten slag particles larger than the filter mesh are directly blocked on the filter surface.

● Rectification and slag-floating mechanism: The rectifying effect of the filter ensures that the horizontal sprue in front of the filter is filled, resulting in a stable laminar flow of the filtered molten metal, thereby reducing oxidation and scouring reactions and facilitating the floating and capture of inclusions.

● Deep adsorption mechanism: Fine inclusions entering the filter's interior are adsorbed onto the skeleton or trapped in dead corners of the network due to full contact with the complex ceramic network.

The filtration mechanism is primarily physical filtration (including mechanical interception and deep adsorption), supplemented by chemical adsorption. The foam ceramic material itself has good chemical inertness and does not react with the filtered molten metal.