The development of ceramic foam filter for foundry products began in the 1970s. After more than thirty years of rapid development, the material of the products is silicon carbide, zirconia, alumina, and graphite. The application fields of ceramic filter for casting include cast steel, cast iron, cast aluminum, and cast copper. Ceramic foam filters can greatly improve the surface quality and performance of castings.
The foam ceramic filter is a special ceramic product with a three-dimensional net structure sintered at high temperature by using polyurethane foam as the precursor, impregnated with refractory slurry forming technology, and sintered at high temperature.
Classification of foam ceramic filter by material: alumina, magnesia, silicon carbide, zirconia, and carbon composite;
Classification of foam ceramic filter by mesh density PPI: 10ppi, 15ppi, 20ppi, 25ppi, 30ppi, 40ppi, 50ppi, 60ppi.
The ceramic foundry filter has a unique three-dimensional connected curved pore network skeleton structure and 80% ~ 90% open porosity. There are four filtration and purification mechanisms, namely: screening cake deep bed filtration mechanism, floating separation mechanism, deep filtration (physical adsorption), and rectification mechanism. The ceramic filter for foundry can efficiently filter out large inclusions and most small suspended inclusions as small as tens of microns in liquid metal. Compared with refractory fiberglass mesh filter screen and straight hole honeycomb ceramic filter, it has the characteristics of high fire resistance, high strength, good filtration effect, and high filtration efficiency.