Alumina Foam Filter
These filters are made by replication technique using
high
quality recticulated foam imported from Germany (Europe).
These filters provide very high surface area made up of the materials like Sic, Zirconia, Alumina,
Etc. which
are non wetting to metals and wetting to the metal oxides and other non-metallic materials.
The tortuous path for liquid metal in the structure of the filter controls the speed of liquid metal
and the
metal gets sufficient time in contact with the filter surface area which increases the filtration
efficiency.
The metal leaving the filter flows perfectly in a laminar fashion & further oxidation of liquid
metal is fully
controlled before its entry into the mould.
Advantages
1. The material construction of Al2O3 (Alumina) does not react with the molten aluminium.
2. Liquid Aluminium gets sufficient time in contact with the filter which very effectively removes all non-metallic particles by adsorption effect.
3. High hot strength of the filter increases life of filter in case of continuous filtration.
| Category | Alumina |
|---|---|
| Color | White |
| Porosity | 10-40 PPI |
| Temperature | 1100°C max |
| Compressive Strength | > 0.8 MPa |
| Bulk Density | 0.45 ± 0.05 gm/cm3 |
| Transverse Strength | > 0.8 MPa |
| Volume porosity | 70 – 75 % |