Removal of inclusions from molten aluminum with actively coated ceramic filters
(School of Materials Science and Engineering,
Shanghai Jiaotong University, Shanghai 200030, China)
Shanghai Jiaotong University, Shanghai 200030, China)
Abstract: Molten aluminum (A001) was filtered by using ceramic foam filters coated with active enamel. Tensile test shows that the elongation of filtered sample is increased by 15.5%, but the tensile strength of the sample is almost the same as that of unfiltered one. The fracture cracks and dimples of filtered sample are fine and homogeneous according to SEM examination. In addition, metallographic observation shows that the filtered sample has very few inclusions of approximately 8μm in diameter, but the unfiltered sample has some inclusions of approximately 60μm in length and 20μm in width. However, it is suggested that the active enamel coat can effectively capture the inclusions and dissolve them during filtering molten aluminum.
Key words: active coating; inclusion; molten aluminum; ceramic foam filter