Foam ceramic filter Canada with polyurethane foam as the carrier, filled by refractory aggregate sintering additives, adhesives and other fine powder and water made of ceramic slurry, and then the slurry is extruded ceramic material around foam fibers.
Polyurethane after drying, burning, high temperature sintering, heat decomposition, leaving foam ceramic products, namely foam ceramic filter.
Ceramic materials for liquid metal filtration have high melting points and will not melt or decompose into liquid metal during casting.
The number in front of PPI represents the pore density of the product. If the model is 10ppi, the stomatal uniformity for any 25.4mm length is 8-12.
Ceramic foam filters filter mechanism in Canada
Like a sieve, it prevents the passage of foreign particles and aggregates larger than the surface aperture of the filter.
After screening, many inclusions larger than the filter pores are trapped at the inlet end of the filter.
As the number of inclusions captured increases, a large inclusion cake will form on the surface of the inlet end of the filter.
The “filter cake” thinns the liquid and partially traps inclusions smaller than the filter aperture.
Deep bed filtration
In the foam ceramic filter, the melt flow path is tortuous, even a small range of cross-flow phenomenon. This has two main functions:
1. Probability of particles contacting the filter.
2, make the melt flow speed and flow direction change faster, make the small inclusions in the melt by the straight hole filter slag (screening) ceramic foam filter and deep filter collision capture left in the corner of the slag retaining bed (screening) ceramic foam filter
Function of foam ceramic filter
Removal of impurities and slag: purification and simultaneous degassing of liquid metal (adjustment of turbulence) :
– After filtration, the viscosity of liquid metal decreases and the fluidity of liquid aluminum alloy increases by 10%-15%. Thus, filtration improves the filling capacity of the molten metal.
– The metal melt is turbulent before filtration, and layered after filtration (the flow path of foam ceramic filter is tortuous), which reduces the formation of gas volume and secondary slag;
– As the filtration goes on, the filtration mechanism changes from sieving, filter cake to deep bed filtration, and the purity of the filtered liquid metal becomes higher and higher (no more than the filtration capacity of the foam ceramic filter).