Abstract
Herein, the aim is to investigate the applicability of various ceramic foam filter materials in the filtration of magnesium alloy melts. The durability of ceramic foam filters is studied throughout their immersion in an AZ91 melt for up to 60 min at 680 °C. The four selected types of ceramic foam samples consist of ZrO2, uncoated Al2O3‐C and Al2O3‐C coated in MgAlON or Al2O3. Immersion tests are conducted for 5–60 min in a vertical tube furnace in an Ar/SF6 protective atmosphere. After their immersion, the cooled filters are evaluated by means of optical and scanning electron microscopy (SEM). Every filter sample retrieved from the melt is intact; layers of MgO and occasional metal droplets are found on their surfaces, confirming their durability and applicability in the filtration of magnesium melts. The pre‐ and post‐immersion cross sections of the AZ91 samples are evaluated by means of an automatic SEM to assess the presence of inclusions in the metal. The number of inclusions containing oxygen or nitrogen is notably lower for AZ91 samples that were in contact with Al2O3‐C‐, Al2O3‐, or MgAlON‐coated filters, showing the potential of these materials for the filtration of magnesium alloy melts.
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