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Principles of Using Ceramic Foam Filters
2021-12-28

Sefu company mainly produces Ceramic foam filters. According to different uses, our company’s ceramic foam filters are mainly divided into three types: silicon carbide foam ceramic filters, alumina foam ceramic filters, and zirconia foam ceramic filters.
Silicon carbide foam ceramic filters are mainly used for filtering high-temperature metal liquids for ductile iron, gray iron, and non-ferrous metals. Alumina foam ceramic filters are mainly used for filtering aluminum alloy liquid metals. Zirconia foam ceramic filters are mainly used for stainless steel. , Carbon steel and large-scale casting metal liquid filtration.
Today we mainly introduce the principles of using ceramic foam filters.

ceramic foam filter

Principles of Using Ceramic Foam Filters:

The position where the ceramic foam filter is placed in the pouring system: the lower end of the sprue, the cross runner, the inner runner, and the sprue cup.
① The closer the placement position is to the casting cavity, the better, which reduces the probability of secondary oxidation;
② The design of the pouring system should be simple, and other slag retaining measures can be ignored, which can improve the utilization rate of the sand mold and the production rate of the process;
③ The working area of the filter should be 4 to 6 times of the blocking cross-section of the pouring system to ensure that the pouring speed is not affected;
④ Select the corresponding filter according to the type of casting alloy and pouring temperature, and should not be used over-temperature;
⑤ Choose the right pore size to really achieve the filtering effect;
⑥ Filters cannot be used to control the pouring speed.