Foam Ceramic Materials Filtration Mechanism
1. Through foam ceramic materials mechanical filtration such as screening inertial impact interception, diffusion interception, friction, sedimentation, etc., the filtration efficiency is proportional to the mesh aperture of the foam ceramic. The smaller the mesh, the stronger the ability to intercept small particles.
2. Sedimentary layer or filter cake layer effect. With the deposition of particles in the melt and the crooked interconnected and uneven grid support walls, the ability to capture miscellaneous particles is improved.
3. The rough surface formed by the gaps on the surface of the mesh frame increases the interface between the molten aluminum flow and the ceramic solid surface, which can promote the flow of particles in the molten aluminum flow to become more disordered, which is conducive to the capture and deposition of solid particles.
4. Due to the microscopic cracks and pinholes on the surface of the skeletal support body, fluoride with a strong affinity for Al2O3 particles is pre-deposited, which promotes a complete filter cake effect and strong chemical adsorption, and the ability to capture retained impurity particles is more strong.
Furthermore, from the temperature field effect of the melting process and the transfer process of the molten metal structure, the concentration of the alloy solute will inevitably be formed. The metal melt is redistributed—integrated—redistributed—integrated again, which is also a very good alloying process, some high melting point metal phases and compounds re-aggregate and grow up, and the fine impurities will accumulate and grow up to facilitate filtration and capture. This can also be explained by the changes in the concentration of H, Al2O3, Fe phase, and Ti phase before and after filtration. Especially two-stage filtration or pore gradient thick plate filtration is more obvious.
AdTech alumina ceramic foam filter adopts three-dimensional network structure, it has the advantages of high strength, erosion resistance, strong adsorption capacity, and effective removal of tiny inclusions in molten aluminum. Ceramic filter is surrounded by Sealing gasket, laying between filter and filter bowl, to prevent molten aluminum leaking through interface. AdTech’s filter adopts sealing gasket in 3 different types, fiber paper material, fiber cotton material, expanding cotton material.