As we all know, ceramic foam filter plates play a very important role in the aluminum liquid purification system. The ceramic foam filter plate can effectively remove large inclusions in molten aluminium casting process, and effectively reduce the size of micro inclusions, improve surface quality and product performance, improve the effect of microstructure and increase output. Ceramic filter plates are used in aviation, transportation, and precision casting of other aluminum alloys.
Alumina ceramic foam filters are mainly used to filter aluminium and aluminium alloys in casting foundries. Because they have excellent resistance to corrosion and corrosion by molten aluminum, they can effectively remove inclusions, reduce trapped gas and provide laminar flow, and then the filtered metal is significantly cleaner. Cleaner metals can produce higher quality castings, fewer scraps, and fewer inclusion defects, all of which help increase profits.
Filtration with ceramic foam filters offers several key benefits that improve the quality of premium aluminum castings. These include:
- Improved mechanical properties;
- Reduced dye-penetrant indications;
- Reduced x-ray evidence of nonmetallics;
- Reduced rework/scrap;
- Improved machining properties.
The presence of nonmetallic inclusions is detrimental to the production of premium quality castings. High attainable mechanical properties are a key aspect that is readily lost in the presence of inclusions and oxide skins. The mechanical properties of high-strength aluminum alloys are very sensitive to notches or imperfections in the casting.
Filtration effectively reduces inclusion levels and subsequent notch effects caused by inclusions. Conventional techniques for attempting to remove inclusions are ineffective, and the use of metal or fiber screens isn’t sufficient to keep the metal truly free of harmful non metallics.
Ceramic Foam Filter Instructions
Inspect and clean the filter box surface debris to keep the filter box clean and undamaged.
Gently place the filter plate in the filter box and manually press the seal gasket around the filter plate to prevent the aluminum liquid from flowing or floating.
Preheat the filter box and filter plate evenly so that it is close to the temperature of the aluminum liquid. The preheating temperature of the filter plate is not lower than 260°C. Preheating to remove adsorbed water helps to facilitate the opening of the initial filter pore size at the moment and prevents the heat from rising and shrinking to block some holes in the filter plate. Preheating can be electric or gas heating, normal heating 15-30 minutes.
When casting, observe the change of the aluminum hydraulic head and maintain the normal demand for the flow control of the aluminum liquid.
The normal initial pressure head is 100-150mm. When the liquid begins to pass, the pressure head will drop below 75-100mm, and then the pressure head will slowly increase.
In the normal filtration process, avoid beating and vibrating the filter plate. At the same time, the water tank should be filled with molten aluminum to avoid disturbance caused by excessive or small molten aluminum.
After filtering, please remove the filter plate and clean the filter box in time.