Chinese
Foam ceramic filters should be handled gently to avoid damage. To ensure adequate filtration of molten metal during operation, the filter must have a certain head pressure when starting. This pressure is needed to overcome surface tension, and its magnitude significantly affects the start of filtration. Generally, the head pressure should exceed 300 mm, and for casting large components, the pressure should be correspondingly higher.
The interface between the foam ceramic filter and the mold should be as tightly sealed as possible to prevent molten metal from leaking through gaps, which would reduce filtration effectiveness. For certain sand molds, such as wet molds, using a foam ceramic filter alone may cause the mold sand around the filter placement to collapse. In such cases, a filter support must be designed to hold the filter in place, preventing movement under the impact of molten metal and avoiding sand particles entering the mold cavity or metal loss.
Before use, foam ceramic filters should be blown with compressed air to remove surface dust and internal fragments, preventing contamination of the molten metal. During transportation and storage, the filters must be kept dry. If necessary, the filters should be baked before use to ensure they are fully dry.
