Why is the ceramic foam filter the best choice for filtering aluminium ...

Ceramic materials have excellent high-temperature resistance and can withstand the operation of aluminum liquid under high-temperature conditions. Aluminum liquid is usually processed at a temperature range of 700°C to 900°C, while ceramic foam filters can maintain strength and stability under such extreme temperatures.

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Ceramic foam filters have high resistance to erosion from gases and impurities in aluminum liquid. Aluminum liquid often contains hydrogen, oxygen, and other gases that can cause corrosion and damage to the filter material. Ceramic filter plates can effectively resist these erosive effects, maintaining the integrity and performance of the filter plate.

Ceramic foam filters can also maintain a stable pore structure under high-temperature conditions. Under high-temperature conditions, some materials may undergo sintering or expansion, resulting in changes or blockages in the pore structure. However, ceramic materials have low thermal expansion coefficients and excellent thermal stability, which can maintain the stability and consistency of the pores at high temperatures.

Ceramic materials have good corrosion resistance to many chemical substances, including aluminum oxide and other metal oxides commonly found in aluminum melt. This chemical stability ensures that the filter plate will not corrode or dissolve when in contact with aluminum melt, thereby ensuring the stability and reliability of the filtration effect.

The pore size of ceramic foam filters can be adjusted according to specific requirements to achieve precise filtration effects. This means that different sizes of pore size can be selected according to the need to filter out specific sizes of impurities and particles. This precision is important for the treatment of aluminum liquid, as impurities in the aluminum liquid may hurt the quality of the final product. Usually, the pore size of ceramic filter plates can be selected from a few microns to tens of microns, and this precise pore structure can effectively filter out impurities and solid particles in the aluminum liquid, providing high filtration efficiency and product quality.

Ceramic foam filters are relatively easy to clean and maintain. Ceramic materials usually have a smooth surface and chemical inertness, making it difficult for impurities to adhere to the filter plate. This can reduce the frequency of cleaning and maintenance and improve production efficiency.

Ceramic materials typically have excellent wear and fatigue resistance and can withstand prolonged use and repeated filtration operations without being easily damaged. In contrast, other materials may deform, wear, or break due to temperature, chemical substances, or mechanical stress, resulting in decreased filtration performance or requiring frequent replacement.

It is important to note that ceramic foam filters also have some limitations. Firstly, they may be relatively expensive, with higher costs compared to other filtration materials. Additionally, due to the brittleness of ceramic materials, careful handling and use are required to avoid damage.

How to choose the correct ceramic foam filters?

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There are many impurities and the casting quality is average. A ceramic foam filter with a larger mesh can be used, and a glass cloth coarse filter is added in front of the filter. At this time, semi-continuous casting is important for coarse filtration using glass cloth. It can cut off the slag from the opening of the furnace eye, and wash the slag from the car wash pool to prevent the filter plate from clogging.

The aluminum casting products are of high quality, and the new type of macroporous ceramic foam is used.

The specifications of the ceramic foam filter are determined by the flow rate of the aluminum melt and the total output.

The color is pure and free of impurities, indicating that the material is uniform; the hands are not sticky, indicating that the surface is not sprayed with adhesive, which will not cause secondary pollution.

When purchasing a ceramic foam filter, carefully evaluate the effective specific surface area or porosity calculation of the foam. You can observe the homogenization state of the mesh surface of the filter plate, and then observe the homogenization state of the cross-section mesh. If possible, the porosity can be calculated by the drainage method. The three-dimensional grid is uniform and the porosity is relatively large, which is an excellent ceramic filter plate.

Choose Ceramic Foam Filters

Transmittance refers to the effective filter area of ​​the foam ceramic filter product. The higher the light transmittance, the fewer blind holes, and the more effective the filter holes (pit holes), the better the filter effect.

Place the ceramic foam filter to be inspected on a light box equipped with a 200W incandescent bulb, and use a uniform 5.0×5.0 mm square transparent plastic square plate to measure the area plate of the large surface of the filter for calculation and testing. The light transmittance of the filter plate is used to determine the light transmittance of the filter plate. In this standard, the transmittance (through-hole ratio) of the filter plate is specified as 95% or more.

Porosity is the percentage of the total volume of the cavities in the filter plate product relative to the total volume of the filter plate product. The porosity determines the filtration capacity of the ceramic foam filter per unit volume. The greater the porosity, the greater the filtering flow of the filter plate, and the stronger the filtering capacity.