| abstract |
A ceramic foam filter for use in filtering non-ferrous metals such as, aluminium and magnesium, the filter comprises calcined alumina as a core material and silica as a binder. Also disclosed is a method of manufacturing a ceramic foam filter for use in filtering non-ferrous metals, the method comprises providing a slurry comprising calcined alumina and colloidal silica, coating the slurry onto a foam precursor, drying the slurry-coated foam precursor to form a green state article, and firing the green state article to vaporise the foam precursor thereby forming a reticulated ceramic foam filter. The slurry may include weight percentages of an acrylic-based organic binder, borate glass, boric acid, a polymeric binder, a rheology modifier and a dispersant. The ceramic foam filter can provide an increased cold modulus of rupture (CMOR) strength, the production of less dust during handling of the filter (reduced snow) and reduced magnesium pick-up. |