molten aluminium Ceramic Filter Foam molten aluminium Ceramic Filter Foam used in the manufacture of castings 已安装的插件brings undeniable benefits, which are determined by quality and economic indicators. Improving the quality of manufactured products, which is determined by the ideal external surface and the purity of the internal...
Production of Ceramic Foam Filter for Molten Metal Filtration The use of aluminum oxide granular material in a ceramic foam filter should seem an obvious choice to any person skilled in the art of refractory materials used to contain molten aluminum and its alloys. Alumina is...
Reticulated ceramic foam filters Reticulated ceramic foam filters used in aluminum oxide granular material should seem an obvious choice to any person skilled in the art of refractory materials used to contain molten aluminum and its alloys. Alumina is relatively chemically inert in molten aluminum and its...
Ceramic foam filter molten metal filtration The manufacture of aluminum ingots and billets for the production of high-quality aluminum products requires that molten aluminum be relatively free of inclusions, such as insoluble solids or immiscible liquid impurities. This is necessary so that the ingots or billets after...
ceramic foam filters in the foundry The use of ceramic foam filters in the foundry allows us to solve two important problems in the first place: to clean the casting metal from non-metallic inclusions and to ensure the laminar metal flow in the gate-feeding system. The high...
Ceramic foam filters used in aluminium casting Ceramic foam filters are designed to ensure high purity of blank casting of aluminum alloys at metallurgical plants and for filtering aluminum castings in foundries. Filters have a three-dimensional structure of interconnected pores forming a labyrinth of the ceramic filter...
Filtering aluminum-based alloys in foundry Alloys of aluminum and other light alloys are particularly prone to the formation of unwanted inclusions. A high magnesium content leads to the formation of oxide inclusions that adversely affect the quality of the metal. The resulting slag inclusions, exfoliating particles of the...
SCIENTIFIC BASES OF EFFICIENCY: The introduction of special components into the filter impregnation composition gives the silica mesh a modifying effect (at the request of the customer), enhanced refining and degassing ability, increased resistance to high temperatures and other useful properties.
The use of FEA casting filters with a special coating makes it possible to ensure high-quality metal purity with high mechanical characteristics as a result of the following effects on the melt:
fine cleaning of non-ferrous alloys of solid non-metallic impurities and gases due to the implementation of effective filtering mechanisms: mechanical retention of slag inclusions and oxide films with sizes exceeding the cell size, delay of inclusions by the slag layer from the supply side of the filter, including particles of significantly smaller sizes, adsorption of undissolved particles and evolution of dissolved gases as a result of contact of a liquid metal with a filter base and a refractory coating;
modification in silumin of eutectic silicon (eutectic) and alpha solid solution of silicon in aluminum (Al grains), grinding, leveling the structure of color castings as a result of saturation of the melt with effective crystallization, modification centers and alloying elements from the impregnating composition;
the release of inert gases during heating and the use of finely dispersed refractories in the impregnating composition guarantees high thermal and chemical resistance of the filter structure during the entire pouring time, which greatly expands the scope of application of filters based on glass fiber for filtering aluminum-based alloys;
the formation of a laminar metal flow behind the filter contributes to the smooth filling of the mold, while reducing the likelihood of destruction of the mold cavity, as well as the likelihood of the formation of new impurities as a result of reoxidation of the molten metal
EFFECT OF APPLICATION:
a sharp decrease in the number of castings defective due to the presence of non-metallic inclusions, oxide films, slag and gases;
simplification and a significant reduction in the metal consumption of gating systems, as the gating system does not need elements that inhibit the movement of metal and slag traps;
optimization of casting speed, prevention of mold erosion, improvement of surface and quality of castings;
increasing the mechanical properties of the cast structure and achieving better density of castings
ADVANTAGES OF USE:
the variety of execution forms (rectangle, circle, funnel, etc.) allows the use of filter elements instead of expensive ceramic foam, mesh ceramic, chamotte and other filters;
low cost and high quality filtration;
simplicity in technology of use (there are no changes in foundry equipment);
the possibility of using direct technology
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Reference parameter on the use of foam filters. Necessary properties. Obviously, the filter should effectively remove particles of inclusions, but not provide excessive resistance to metal flow. To work successfully, the filter must also withstand the thermal and mechanical stresses that occur during casting. The filter should...
How the filter works.
There are three main mechanisms of the filtration process by which the filter removes inclusions from molten metal:
Filtration occurs through a combination of three mechanisms: filtering by sieving, filtering by increasing cake, filtering with a deep bed.
Screening is the mechanism by which particles remain on the surface of the filter, since they are larger than the openings of the filter.
Cake filtering occurs when inclusion particles are separated from the molten metal due to the development of a layer or cake (pre-deposited particles). The cake becomes thicker during the filtration process, causing the metal flow to slow down and stop completely over time.
In deep bed filtration, the retained solids are significantly smaller than the pores of the filter. Surface forces cause particles to adhere to the surface of the filter. This mechanism is especially effective with ceramic foam filters due to the tortuous flow path through the filter.