High Performance SIC Al2O3 ZrO2 Ceramic Foam Filters for molten metal filtration
Model Name: NINGXIN-CFF-Z1
Application: For the filtration of molten Iron,copper, aluminum and steel alloy
Ceramic foam filters offer a simple, reliable and costeffective method to remove inclusions. Filtering with CFF is a supplement to metal treatment within the furnace, such as fluxing and degassing or inline filtration.
Ceramic foam filters have an open pore reticulated structure with very high porosity and surface area to trap inclusions. The open foam structures are compose of ceramic material, such as alumina, mullite or silica. Alumina is the most common filter material. Ceramic foam filters operate in a deep bed filtration mode where inclusions smaller than the pore openings are retained throughout the cross-section of the filter.
CFFs typically are a polyurethane foam coated with a ceramic slurry then dried and fired. During firing, the polyurethane foam dissipates leaving behind a porous ceramic structure. The ceramic can be a phosphate-bonded alumina and pore sizes and thicknesses can vary.
| Main material |
Silicon carbide (SIC), Alumina, Zirconia |
| Working Temperature |
1100ºC - 1700ºC |
| Color |
Grey/white/yellow |
| Hole density |
10/15/20/25/30PPI (PPI=pores per inch) |
| Porosity(%) |
80‐90 |
| Compressive Strength(MPa) |
≥1.0 (Room temperature) |
| Bulk Density(g/cm3) |
0.35‐0.55/ 0.4-0.5/0.8-1.1 |
| Thermal shock resistance |
≥2times/1100ºC‐Room temperature |
Ceramic foam filters are mainly designed to improve the quality of metal castings. The filter can effectively remove non-metallic inclusions including slag and dross from the molten metal stream. Additionally, they aid in reducing turbulence in the gating system. Ceramic foam filter's outstanding thermal shock resistance and high strength properties were developed for superior performance in extreme iron, steel or aluminum and copper based alloy foundry applications.
Inclusion removal efficiency in molten steel filtration
Inclusion removal efficiency was observed to be strongly dependent on the initial inclusion concentration. Solid alumina inclusions are found to be captured within the filter at the metal-filter macropore interface. The concentration of the captured solid inclusions decreased exponentially from the entry to exit side of the filter, following first order capture kinetics. Liquid inclusions were captured within the micropores of the ceramic web structure and at the metal-filter macropore interface. The captured liquid inclusion concentration within filter micropores also followed an exponential trend for lower inclusion loading, whereas it became constant for higher inclusion loading due to complete saturation of the ceramic web micropores. Upon filter micropore saturation, continuous liquid inclusion films developed at the metal-filter macropore interface, increasing the possibility for the release of large liquid inclusions from the filter.
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