Alumina foam ceramic filters can reduce or eliminate casting defects through mechanical interception, rectifying scum and deep adsorption through three filtering and purification mechanisms, and improve alloy yield and processing performance.
In the process of melting and pouring of aluminum and its alloys, defects such as inorganic inclusions and shrinkage holes are the main reasons that lead to the scrap of castings. Inclusion defects not only affect the appearance of the product, but also seriously reduce the mechanical properties and service life of the product. Therefore, reducing inorganic inclusions and pore defects is the key to producing high-quality castings.
Alumina Foam Ceramic Filters
Traditional alumina foam ceramics are prone to corrosion and damage during long-term use in contact with molten aluminum. Although this problem can be solved by replacing them in advance, this will inevitably reduce the single casting volume, increase the number of shutdowns, and increase the enterprise. The production cost of the company has caused low production efficiency. Moreover, in the contact between alumina foam ceramics and molten aluminum, some pore ribs are often broken due to the erosion of molten aluminum, resulting in secondary slag inclusion pollution, which has high requirements and high requirements for the automotive, aerospace, military and other industries. For standard products, it is extremely disadvantageous. Therefore, it is of great significance to improve the corrosion resistance of alumina ceramic foam and extend its service life.
The alumina ceramic foam filter produced by AdTech which is resistant to corrosion by molten aluminum has good high temperature stability and corrosion resistance. Make it suitable for the production of high-quality castings in automobiles, aerospace and military industries, extend the service life of alumina foam ceramics, and improve the production efficiency of related enterprises.
Alumina foam ceramic filters are made of polyurethane sponge as a matrix, impregnated with a slurry prepared by ceramic powder and solvent, and dried and sintered: it is characterized in that: the ceramic powder is made of alumina powder, Kaolin powder, barium carbonate powder or barium sulfate powder are mixed; the solvent includes water and silica sol; the alumina powder, kaolin powder, barium carbonate powder or barium sulfate powder is combined with The silicon oxide in the silica sol reacts in situ to produce barium feldspar that is not easily infiltrated by the aluminum liquid: the alumina ceramic foam filter is coated with a layer of boron nitride paint.