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Aluminum is a metal used often for its relative strength given its lightweight. When aluminum is cast, however, impurities known as inclusions can create weak points in the product. These inclusions will lead to defects in the structure of the aluminum alloy casting. With the demand for higher quality aluminum products increasing, especially in the aerospace industry, so does the need for the quality of aluminum alloy products. In order to remove impurities from the melt to provide cleaner, better quality aluminum, one of the most effective cleaning methods is Degassing Aluminum. It is therefore essential to remove hydrogen and non-metallic inclusions from the molten metal prior. Degassing Unit for Aluminum Alloy Molten aluminum is extremely reactive, so when it comes in contact with moist air or wet tools, the water decomposes to release hydrogen in the melt. And the dissolved gas has an overriding effect on the distribution and amount of porosity and shrinkage. Degassing Aluminum is a process used to remove hydrogen and other solid impurities from the molten aluminum. Degassing aluminum can prevent and minimize the introduction of hydrogen in the melt, and remove the hydrogen prior to pouring. AdTech has long been aware of the need for an effective fluxing gas treatment to remove hydrogen and inclusions. So the online degassing unit by AdTech can meet this requirement and achieve the best possible degassing efficiency. The rotary degassing has a major breakthrough in automated, efficient, cost-effective degassing. The principle of degassing machines needs a rotor, it can generate very fine bubbles of inert gases that are evenly and consistently distributed throughout the metal bath. Degassing Unit has an ultra-long life furnace body using new high-silicon molten material manufacturing technology. The degassing rotor, heater protection sleeve, and thermocouple protection sleeve are all made of silicon nitride (Si3N4) ceramic manufacturing technology. It is to exclude hydrogen and other residues contained in molten aluminum and its alloys that affect its quality and mechanical properties ...
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Aluminum is the most abundant metal element in the earth's crust. The density of aluminum is very small, only 2.7 g / cm, and it is malleable. It can form an oxide film to prevent metal corrosion in humid air. Aluminum can be made into a variety of shapes: rod, sheet, foil, powder, ribbon, and wire. The aluminum alloy casting has been mature in the world. Aluminum Alloy Casting For aluminum alloy casting, the aluminum alloy of the parts can be directly obtained by the metal melting casting process. Aluminum melting and casting include melting, purification, impurity removal, degassing, slag removal, and casting processes. The aluminum liquid drawn from the electrolytic cell contains impurities, so it needs to be purified before casting. The main process is as follows: (1) Ingredients: According to the specific alloy grade, calculate the amount of various alloy components, and match various raw materials reasonably. (2) Smelting: Add raw materials to the melting furnace according to the process requirements, and effectively remove the debris and gas in the melt by means of aluminum degassing and slag refining. (3) Casting: Under certain casting process conditions, pour the melton aluminum into the models, and cool the liquid aluminum through a casting system. Aluminum Alloy Application Because aluminum has many excellent properties, aluminum has extremely wide applications. (1) Various aluminum alloys, such as hard aluminum, anti-rust aluminum, cast aluminum, etc. These aluminum alloys are widely used in manufacturing industries, such as airplanes, automobiles, trains, and ships. In addition, space rockets, space shuttles, and satellites also use a large amount of aluminum and aluminum alloys. (2) The conductivity of aluminum is second only to silver and copper. The oxide film on the aluminum surface not only has the ability to resist corrosion, but also has a certain insulation. So aluminum has a wide range of uses in the electrical appliance manufacturing industry, wire and cable industry, and radio industry. (3) Aluminum is a good conductor of heat, and its thermal conductivity is three times greater than that of iron. Industrially, aluminum can be used to manufacture various heat exchangers, heat dissipation materials, and cooking utensils. (4) Aluminum has good ductility, it can be made into aluminum foil, aluminum wire, aluminum strip, and various aluminum products. (5) Due to the dense oxide protective film on the surface of aluminum, it is not easy to be corroded. So it is often used ...
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The aluminium degassing flux is a white powder or granular flux, which is prepared by mixing various inorganic salts in a certain proportion after drying treatment. The refining agent is mainly used to remove the hydrogen and floating oxidized slag inside the liquid aluminum. So the liquid aluminum becomes purer, and it has the function of a slagging flux. Aluminium Degassing Flux Hydrogen has a higher solubility in the melton aluminium. The hydrogen mainly comes from the chemical reaction of aluminum with the moisture, and a part of it comes from the hydrogen in the air. In addition, aluminum is prone to contact with water vapor in the air, which is also an important reason for the increase in the gas content. When casting slabs, pay attention to the water content of the environment and the casting temperature. The higher the solution temperature, the greater the solubility of hydrogen in the aluminum liquid. It is inevitable that the aluminum ingot contains hydrogen. The hydrogen in the aluminum melt can form defects during the solidification of the ingot, such as looseness, porosity, and white spots. When the temperature of the ingot rises significantly, from hot rolling to annealing, the pores will form blisters on the surface of the ingot. During the rolling process, the edges of the strip will crack at the edges. Therefore, in the manufacturing process of aluminum ingots, controlling the cleanliness of molten metal is a very important part. This is why in different stages of aluminum melt processing. It is necessary to obtain clean molten metal by aluminum degassing flux and degassing filtration equipment. Some components in the aluminum degassing flux are easily decomposed at high temperatures. The generated gas is easy to react with hydrogen, and has strong adsorption force with the slag, quickly escapes from the melt. Sprinkle the refining agent on the liquid surface, it will quickly enter the aluminum liquid. Stir it fully, stand and remove the slag ...
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With the advancement of preparation technology, ceramics have more novel forms, such as porous structure. Porous ceramics have a large number of interconnected pores. So porous ceramics have the characteristics of small volume density, high specific surface area, and low thermal conductivity. The high specific surface area of ​​the porous ceramic makes it have good adsorption capacity and activity. As a catalyst carrier, the porous ceramic filter has a porous structure. It can increase the effective contact area and improve the catalytic effect. At the same time, it has the features of thermal shock resistance and corrosion resistance. Porous Ceramic Filter The ceramic foam filter has the characteristics of large filtration area and high filtration efficiency. The alumina foam ceramic filter has stable chemical properties, and can withstand the corrosion of acids, alkalis, and other organic solvents. And ceramic foam filter can stand the high-temperature changes, no slag in the production process. The foam ceramic filter can separate solid particles suspended in liquid or gas, or two immiscible liquids. It can make the molten steel fill the cavity more evenly. The molten metal has a higher tendency to turbulence during pouring. Alumina ceramic filter is suitable for aluminum casting filtration, such as aviation, transportation, computer hard drive, PS baseboard, canning materials, fan blades for turbojet engine, and other aluminum alloy precision casting. Ceramic Foam Filter Application Nowadays, with the improvement of the quality requirements of aluminum products, the application of the porous ceramic filter has also been promoted. The porosity of the porous ceramic filter is between 80 and 90%, which can effectively eradicate the micron-sized small inclusions. In addition, through the adsorption effect, the ceramic filter plate can also remove the content of harmful elements (Na, K) in the aluminum liquid. When filtering the aluminum alloy, the filter plate is thermally expanded in an instant, so as to ensure that it does not crack when heated ...
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