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.
Functions
1. The disinfection of melting metal fluid
2. Simplified navigation system
3. Improving the metallurgical structure of castings
4. Reduce stealth castings
5. Improving casting quality
6. Reduction of internal defects of re-oxidation of castings
7. Reduce surface defects after processing castings
Performance and Applications
1. Filter-PAL filter is an alumina ceramic product with a three-dimensional network structure through high temperature sintering
2. High strength, erosion resistance, strong adsorption of impurities, can effectively remove tiny inclusions in molten aluminum
3. Widely used in aluminum foil roll casting blanks, production of aluminum and automotive hubs casting blanks
4. Higher applicability and cost-effectiveness
Information about the company
AdTech manufactures materials and provides services for high temperature filtration and purification with strong technical strength and control system. AdTech is located in Wen County, China, which covers an area of over 20 acres with 20,000 square meters of workshop and warehouse. AdTech serves customers from dozens of countries and regions, including China (China Aluminum Industry, Zhongwang China, Weiqiao, Midas), the Middle East (Bahrain aluminum, Dubai aluminum, Midal cables), Southeast Asia (metal press, GVA, Jindal,) and Europe (hydro, Rusal), etc. AdTech has established long-term relationships with a number of world-famous enterprises. AdTech is a global provider and provider of high-end online degassing and high-temperature filtration and material purification solutions for the high-precision aluminum foundry industry.
Questions and answers
1. Q: Are you a factory or a trading company?
A: we are a factory which was founded in 2012
2. Q: What are your main products?
A: We have been producing online degassing, filtration equipment, ceramic foam filter, hot casting materials, nozzle, Repair coating material and flow abroad for many years.
3. Q: How can you control the quality?
A: For each product processing, we have a complete quality control system for chemical composition and physical properties. After production, all products will be tested, and we have quality certificates with ISO9001 / ISO14001 / SGS.
4. Q: What payment term can you accept?
A: T / T or L / C
5. Q: How can I get samples?
A: We are honored to offer you samples.
6. Question: Does your company accept customization?
A: we accept OEM service.
7. Q: can we visit your company?
A: Yes, of course, you can visit our company.
In filters, polyurethane foam is used as a matrix, which allows to prolong the procedure by catalysis. To this end, the foam is treated with a special ceramic suspension, after which it is dried. Billets with different geometric shapes are supplied to special equipment in which the polyurethane foam matrix burns, leaving the base of the cellular type of finished ceramic products.
The mesh structure of the ceramic foam filters ensures reliable disposal of impurities. Productive filtration can be achieved even under conditions of impressive metallostatic pressure. Ceramic foam filters cannot be dispensed with during both primary and secondary melting processes. They are also installed in aluminum smelting units.
The main functions of foam filters include:
Purification of molten compounds from additives of metallic as well as non-metallic nature.
Reducing the number of oxides.
Increased fluidity of the material.
Get rid of various flaws in the metal.
Improving the quality of casting due to changes in mechanical parameters.
The unique mesh structure of filters created from polyurethane foam, they are highly effective in performing filtration, when compared with other filters involved in the foundry sector.
Ceramic foam filters demonstrate a high level of resistance to the influence of high temperature conditions, they easily absorb molten metal substances. Due to the excellent strength properties, such products can be used even without mounting auxiliary metal screens.
Main characteristics of ceramic foam filter
AL2O3 content: 85 - 90%
Porosity: 75 ... 8%
Sizes: 10 '' ... 26 ’’ (production of the filter under the Customer is possible)
Porosity, PPI: 10 ... 70
Bending Strength: approx. 1.5 MPa
The density of the material: 2.2 g. / cm3
Operating temperature: + 1000 - 1200 оС
Main advantages of the Ceralu filter:
Uniform pore structure
High surface strength (less “snow” in the package)
High operating temperature, up to 1150 ° С
High chemical inertness to reagents. used in foundry and k. aggressive aluminum melts (8xxx alloy)
Cerapor LD series ceramic foam filter has been successfully used for casting aluminum. Cerapor LD series filters can be used to cast all common aluminum casting alloys.
Filters of the Cerapor LD series are made of quartz-based material using silica as a binder, have a density slightly lower than that of liquid aluminum (lower by 0.4 g / cm3), i.e. the filter is always on the surface of the liquid metal.
Main technical data of the Cerapor LD filter:
Filter size: 40 * 40 ... 100 * 100 mm (round - D40 ... D100 mm)
Porosity, PP: I 10 ... 30
Thickness: 22 (15) mm
Special shapes and sizes are available to order.
Kin Ceramic Filters Company Short description
Zirconium is the most famous advanced ceramic material widely used in automotive, petrochemical, fluid control, transmission materials, industrial, electrical and electronic, and semiconductor.
Sapphire is a single crystal alumina.
The ceramic foam filter is a highly efficient molten metal filter.
The three-dimensional structure of the mesh skeleton and its high porosity make it have many advantages, a large slag collection area, a large internal filtration area, low flow resistance, and good filtration effects.
Kin Ceramic Filters Company Characteristics
1. Purification of molten metal fluid, simplified gating system
2. Improve the metallurgical structure of castings and reduce the performance of castings
3. Improve the quality of castings and reduce the internal defects of reoxidation of castings
4. Reduce surface defects after casting