The ceramic foam filter for casting can effectively remove large inclusions in the liquid aluminum, and absorb micron-sized fine inclusion particles. It plays a role in improving surface quality, product performance, microstructure, and yield. Molten aluminum filters are widely used in aluminum profiles, aluminum foil, aluminum alloy and other production fields. The foam filter uses a three-dimensional network structure and organic foam cotton connected to the pores as a carrier. Invades it into a special ceramic slurry with thixotropy, and adopts a special rolling process, make the ceramic slurry evenly apply to the skeleton of the carrier. After drying and curing, and then roasting at high temperature. AdTech offers alumina ceramic foam filters (CFF-PAl) and zirconia foam ceramic filters (CFF-PZr).
Alumina Ceramic Foam Filters
Alumina ceramics is the most widely researched and applied engineering ceramics. It has the advantages of high melting point (2050 ℃), high hardness (90-92HRA), good insulation performance (volume resistivity up to 1015Ω · cm), good chemical stability. Alumina ceramic foam filters are widely used as high-temperature structural materials, wear-resistant materials, electrical insulation materials, and chemical corrosion-resistant materials.
Zirconia Ceramic Filters
Among various types of metal oxide ceramics, zirconia has the best high temperature stability, and it is most suitable for ceramic coating and high temperature refractory products. The thermal conductivity of zirconia is the lowest among common ceramic materials, and the thermal expansion coefficient is close to that of metal materials. Zirconia ceramic has become an important structural ceramic material, and its special crystal structure makes it an important electronic material. The phase change toughening characteristics of zirconia ceramics make it a hot research object of plastic ceramics. Zirconia ceramic foam filters have good mechanical properties and excellent thermophysical properties. Among various metal oxide ceramics, the use of zirconia ceramics is second only to alumina ceramics.
Zirconia ceramics can obtain high strength and toughness through phase transformation toughening. Partially stabilized zirconia ceramics are the ceramic materials with the highest strength and toughness at present. Its flexural strength can reach more than 1500MPa. And the fracture toughness KIC can reach 15MPa • m1 Above / 2, zirconia ceramic is equivalent to the strength and toughness of steel, so it is known as “ceramic steel”. Zirconia ceramics have fine grains, high strength, good toughness, high wear resistance (usually 5-10 times higher than alumina ceramics), and exhibit good self-lubricating properties.