Characteristics And Definition Of Silicon Carbide Foam Ceramic Filters

A silicon carbide foam ceramic filter is a porous ceramic product manufactured primarily from silicon carbide using the organic foam impregnation method; it features a three-dimensional, interconnected, curved-pore skeletal structure.

1. Physical Properties

High-Temperature Resistance: The maximum operating temperature ranges from approximately 1500°C to 1530°C, with certain products capable of reaching 1560°C, making them suitable for the filtration of high-temperature molten metals.

High Strength: Possesses excellent mechanical strength at both ambient and elevated temperatures; it exhibits strong resistance to thermal shock and erosion by molten metals, ensuring it remains intact and does not fracture during the casting process.

High Porosity: Features an open porosity ranging from 80% to 90%, which ensures efficient filtration while maintaining excellent permeability for the molten metal flow.

2. Filtration Mechanism

Mechanical Interception: Slag particles larger than the mesh openings are directly blocked and retained on the surface of the filter plate.

Flow Rectification and Slag Control: Transforms the molten metal flow from turbulent to laminar, thereby minimizing secondary oxidation and stabilizing the mold-filling velocity.

Deep-Bed Adsorption: Fine inclusions are adsorbed onto the ceramic matrix-or trapped within the dead-end pores of the network-through extensive contact with the ceramic structure.