What is Alumina Ceramic Foam Filter Plate?

Alumina foam ceramic is a kind of foam material made from high purity alumina. The foam ceramics have the characteristics of uniform porosity, high temperature resistance, heat shock resistance, wear resistance and chemical stability.

Products are widely used in casting processing, water treatment, chemical industry, environmental protection and other industries. Is the ideal liquid aluminum filter; Catalyst support, and good sound insulation, thermal insulation material. Product shapes, sizes, and voids PPI can be designed and manufactured on request.

What is the application?

Aluminium Ceramic Foam Filter Plate is suitable for the filtration and purification of aluminum and alloy solutions with the temperature of 1000 ℃

In order to meet the increasing quality requirements of aluminum castings, the application of alumina ceramic foam filters (plates) is becoming more and more important. Filters are also widely used in ordinary sand casting, such as wet mold casting, and fixed mold casting, such as automotive aluminum parts casting.

Alumina foam ceramic filter plate is very important to the quality of aluminum melt, which affects the subsequent processing performance and the quality of final products to a great extent. Therefore, all countries in the world attach great importance to the purification of aluminum melt.

The product is mainly used in the purification process of aluminum and aluminum alloy production, but also used as a variety of gas-solid, liquid-solid separation media, catalyst carrier, burner and sound absorption and environmental protection fields.

What is the classification?

Usually, there are two size cut, one is right-angle side, the other is bevel edge. Also, there are two types Edge Covering: Asbestos---Normal and Expanded Vermiculite---Superior.

Why use Alumina Ceramic Foam Filter Plate?

There are many reasons for aluminum pollution:

● In the smelting process, aluminum is exposed to the furnace atmosphere in a molten or semi-molten state, easy to oxidize, easy to react with water vapor and absorb hydrogen, easy to form various forms of non-metallic slag (such as furnace lining debris, chloride, carbide in flux, etc.) and coarse metal intercompound particles and so on. 

● Part of the waste that makes up the charge brings some non-aluminum impurities into circulation.

Because the waste comes from the factory of each process waste and waste and waste outside the plant, so the way is different, the composition is complex, the quality is poor. These impurities often make the billet produce bubbles and inclusions, which seriously affect the purity of the metal melt, and further affect the machining properties, mechanical properties, corrosion resistance and the appearance quality of the product.

Alumina foam ceramic filter plate can effectively remove all kinds of inclusions with fineness up to micron level in aluminum liquid, make aluminum liquid into a steady laminar flow, which is conducive to filling. 

It has a unique mullite-corundum structure, good mechanical strength and chemical stability, excellent resistance to aluminum liquid erosion performance.

It can obtain stable filtration effect by strict control of hole size and through hole rate.

The ceramic foam filter plate is surrounded by a sealing ceramic fiber liner, which facilitates the seal of the filter plate in the filter box to ensure that there is no metal liquid sideflow.

User Manual

1. Clean filter box

2. Gently put the filter plate into the filter box, and press the sealing gasket around the filter plate by hand to prevent the flow of molten aluminum.

3. Evenly preheat the filter box and filter plate to make it close to the temperature of the molten aluminum. Preheat to remove moisture and facilitate initial instant filtration. Preheating can be carried out using electric or gas heating. Under normal circumstances, it takes about 15--30 minutes.

4. Pay attention to the change of the aluminum hydraulic head during casting. The normal initial pressure head is 100-150mm. When the molten aluminum begins to pass, the pressure head will drop below 75--100mm, and then the pressure head will gradually increase.

5. During the normal filtration process, avoid knocking and vibrating the filter plate. At the same time, the launder should be filled with molten aluminum to avoid too much disturbance of the aluminum liquid.

6. After filtration, take out the filter plate in time and clean the filter box.

Quality Assessment Factor

● Transmittance---Light transmittance refers to the effective filtering area of plate. The higher the transmittance, the fewer blind holes, the more effective filter holes (display holes), and the better the filtering effect.

● Porosity---Porosity refers to the percentage of the total volume of pores in the filter plate to the total volume. The porosity determines the filtration capacity per unit volume. The larger the porosity, the greater the filtration flow of the filter plate and the stronger the filtration capacity, and vice versa.

● Pore uniformity---Pore uniformity is used to describe the difference between the actual number of pores per 25.4mm length in the filter plate and the theoretically required number of pores. The smaller the gap, the better the product quality. If the gap is too large, the filter plate will reduce the retention capacity of impurities or the filtration speed of the melt is too slow, which cannot meet the individual requirements of users in production. The size of the pore uniformity mainly depends on the foam used in the production of the filter plate. The pore uniformity of the foam is good, and the pore uniformity of the filter plate is good, so the selection of the foam is extremely important.

● Compressive strength---The higher the compressive strength, the more durable the product, the better the quality, and vice versa.

Physical Performance Indicators

Technical Data Sheet

Size and shape deviation