These ceramic foam filters are designed for mould-casting metal. Thanks to the mechanism of creation of the “filter cake” on the inlet filter side and thanks to depth filtration inside the ceramic matrix, these ceramic foam filters are an effective instrument to reach metallurgical purity of molten metal during the process of casting. The filters also calm mould filling, thus preventing creation of undesirable defects in the casting.
These filter features are conditioned by the open 3D structure of the ceramic matrix created by the system of mutually interconnected cells. They are characterised by a very good thermal conductivity, stability and resistance to sudden temperature changes.
Types of ceramic foam filters are conditioned in particular by requirements for their application. Filters for filtration of nonferrous metal alloys (casting temperature up to 1000 °C), filters for filtering cast iron with flaky and spheroidal graphite and filters intended for steel filtration are therefore used in practice. Depending on the cast material, Al2O3, SiC, ZrO2 or graphite based filters are applied.