NEWS

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 ...

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 ...

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 ...

 A porous ceramic filter is a high-temperature filtration medium used to remove non-metallic inclusions, oxide films, and suspended particles from molten metal before it enters the casting cavity. In aluminum processing, it is one of the most reliable interventions for improving melt cleanliness, reducing scrap rates, and meeting increasingly strict quality standards across aerospace, automotive, and packaging applications. What Is a Porous Ceramic Filter and How Does It Work? Porous ceramic filters are open-cell foam structures with interconnected pores distributed throughout the body. Porosity typically ranges between 80% and 90%, which gives the filter an exceptionally high internal surface area relative to its volume. When molten aluminum passes through this structure, two filtration mechanisms work simultaneously: physical sieving, which blocks particles larger than the pore openings, and depth filtration, where smaller particles adhere to internal pore walls through surface adhesion and tortuous flow paths. The result is a dramatic reduction in suspended inclusions—including oxide bifilms, slag fragments, flux residues, and refractory particles—before the metal reaches the mold cavity. This directly improves mechanical properties, surface finish, and pressure tightness in the final casting. What makes porous ceramic filters particularly well-suited to aluminum processing is their combination of: High porosity (80–90%) enabling adequate flow rates without excessive metallostatic head loss Thermal shock resistance allowing rapid immersion into metal streams without cracking Chemical inertness against molten aluminum, alkalis, acids, and organic solvents Zero slag generation—the filter itself contributes no contamination to the melt What Types of Porous Ceramic Filters Are Available? Not all porous ceramic filters are the same material or geometry. Selection depends on alloy type, pour temperature, required cleanliness level, and production volume. Below is a practical breakdown: Filter Type Base Material Typical Application Max Operating Temp Alumina Ceramic Foam Filter Al₂O₃ Aluminum and aluminum alloy casting 1100°C Zirconia Ceramic Foam Filter ZrO₂ Steel, cast iron, high-temp alloys 1760°C Silicon Carbide Foam Filter SiC Gray iron, ductile iron 1500°C Magnesia Ceramic Filter MgO Special steel, high-alloy casting 1700°C Data compiled from industry filtration standards and supplier technical specifications across major foundry markets. Operating temperatures reflect continuous service limits under standard casting conditions. For aluminum casting specifically, alumina-based ceramic foam filters dominate because they are chemically stable in contact with aluminum melts and remain structurally intact through the full casting cycle. Zirconia and SiC filters are designed for ferrous applications and offer little practical advantage in aluminum at additional cost. What Pore Size Should You Choose ...