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Alumina-based foam ceramic filters were fabricated by using alumina,SiC,magnesia powder as major materials.It has been found that this ceramic filter has a uniform macrostructure for filtering molten metals.The influences of SiC and magnesia content,the sintering temperatures on ceramic properties were discussed.Alumina-based foam ceramic filters containing 2.2 mass% magnesia and 7.6 mass% SiC has a compressive strength of 1.36 MPa and a thermal shock resistance of 5 times.Its main phases after 1 hour sintering at 1 500℃ consist of alumina,silicon carbide,spinel and mullite.
Alumina-based foam ceramic filters were fabricated by using alumina, SiC, magnesia powder as major materials. It has been found that this ceramic filter has a uniform macrostructure for filtering molten metals. These influences of SiC and magnesia content, the sintering temperatures on ceramic Alumina-based foam ceramic filters containing 2.2 mass% magnesia and 7.6 mass% SiC had a compressive strength of 1.36 MPa and a thermal shock resistance of 5 times. If main phases after 1 hour sintering at 1 500 ℃ consisting of alumina , silicon carbide, spinel and mullite.