The molten metal filter media is used to filter molten aluminum. Reticulated foam filters using alumina aggregate particles in the binder phase are generally used to filter aluminum and aluminum alloys.
Generally, inclusions, especially non-metallic inclusions, are mixed into molten aluminum. If such molten metal is rolled after casting or the like and made into a product such as a disc-shaped material without removing the inclusions from the molten metal, the non-metallic inclusions mixed therein may cause defects such as pinholes.
In order to avoid this defect, the usual method is to use molten metal filter media to remove inclusions. The ceramic foam filter is an integrated, disposable, or disposable filter for single casting.
The filtration of the filter is 4 to 28 holes per cm (10 to 70 holes per linear inch), which corresponds to holes with a diameter of approximately 0.036 to 0.26 cm.
Ceramic foam filters are usually produced in square sizes, ranging from 22.86 cm × 22.86 cm × 5.08 cm (9 inches × 9 inches × 2 inches) to 66.04 cm × 66.04 cm × 5.08 cm (26 inches × 26 inches × 2 inches).
The thickness of the fiber gasket material is usually about 0.317 cm to 0.476 cm (1/3 to 3/16 inch), and is usually composed of silicate fibers, which expand during heating to increase the pressure of the gasket.
Advantages of Ceramic Foam Filter Material
- In high thermal shock resistance-during preheating or molten metal contact, the material must not crack or peel off.
- Corrosion resistance: the obvious reaction of the filter material in the expected application range (time, temperature, alloy content), and the substitution of molten aluminum and its common alloys must be maintained.
- Sufficient bending and compressive strength.
- Production economy.
- The filter material used must be properly handled and disposed of.
- Low density or light weight, making the casting pit operator easy to operate.