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Forum Overview » Homepagetools - Support » Off-Topic » Explaining Molten Aluminium Degassing
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Explaining Molten Aluminium Degassing
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Molten aluminium degassing using Adtech



Molten aluminium (Al) is an extremely reactive substance. The molten metal is so reactive that it will readily decompose water in the atmosphere, or moisture on wet tools, releasing hydrogen into the melt. Even small volumes of water condensing on a crucible furnace or transfer ladle can affect the quality of final castings. Excess hydrogen can affect the distribution of porosity, and the total amount of shrinkage, ultimately increasing scrappage. Eliminating gas absorption from molten aluminium is unfeasible. So, metallurgists tend to focus on preventing hydrogen introduction into the melt and removing as much as possible prior to casting.

Why aluminum degassing is Important

Aluminium and its alloys are susceptible to a unique form of chemical corrosion known as hydrogen-induced cracking, which is caused by the gradual diffusion of hydrogen (H) molecules through the metal’s crystal lattice. This creates a localised flaw within the alloy that can significantly impair both its tensile strength and ductility, reducing its fracture toughness, thus increasing the risk of surface fracture. While solid, the hydrogen solubility of aluminium is negligible. Molten aluminium, however, is an incredibly reactive substance that actively decomposes moisture to produce hydrogen (H).

Aluminium Foundry – Image Credit: Shutterstock

Explaining Molten Aluminium Degassing

Molten aluminium degassing is an essential process in alloy casting. It is carried out through one of two methods: flux or rotary degassing. A rotary aluminum degasser comprises a motorized drive and a hollow, rotating shaft that directly injects an inert gas such as argon (Ar) or nitrogen (N2) into the aluminium melt. The combination of the shaft’s rotating motion and the purging of this inert gas causes a high volume of bubbles to form within the melt.

Hydrogen that has dissolved in the molten aluminium then diffuses into these bubbles and separates from the liquid phase. This provides a more efficient and clean method of hydrogen removal compared to flux degassing.

Adtech for Molten Aluminium Degassing

Degassing molten aluminium can be problematic as it must be carried out in situ when the melt is maintained at temperatures exceeding 700°C (1292°F). This can induce chemical attack and thermal degradation of the rotor shaft and purge valves. Silicon nitride (Si3N4) degassing components have been widely used, but there are alternative refractory materials that are more cost-effective while offering almost identical oxidation resistance and high-temperature performance.

Read More: The Difficulties of Aluminium Handling

Rotary degassers engineered using Adtech ceramics are uniquely suited to withstand the demanding thermochemical conditions of molten aluminium processing. Adtech 101 is an advanced engineering material that is non-reactive to molten aluminium over extensive periods of exposure (<1000 hours). It has found wide-ranging applications in non-ferrous metal handling and forming and exhibits good potential for use in essential degassing procedures.

Adtech rotary degassers can successfully achieve equilibrium of molten aluminium in a ladle prior to forming, improving casting yields and reducing unnecessary costs associated with scrappage. In fact, Adtechs serve a number of critical uses in the aluminium industry.

Molten Aluminium Processing with International Adtech

International Adtech is the UK’s leading authority on Adtech technical ceramics for industrial applications. We have developed an innovative range of technical materials for molten aluminium handling, including Adtech 101. Otherwise, contact us directly for any more information about engineering Adtech rotary degassers for molten aluminium casting.



6/28/2022 8:33:06 AM   
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To further comprehend the aluminium extrusion procedure, consider the operation of a Play-Doh® Fun Factory. Consider Play-Doh® as the aluminium billet, the handle as the ram, the shape bar as the die, and the Fun Factory as the extrusion press. Selecting the desired shape and colour comes first. Click here ti try https://www.sjhmalu.com/product/20-series-aluminum-extrusion-profile for more exploration, Consider the form as the die and the colour as the necessary alloy and temper. The Play-Doh® is then put into the holding chamber and the handle is squeezed to push the Play-Doh® through the shape. The ram in an extrusion press, which is attached to the dummy block at the stem's end, exerts pressure on the billet.


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Aluminum bar stock is a type of aluminum product that is commonly used in construction, manufacturing, and other industries. It is a versatile and lightweight material that offers a range of benefits over other types of metal bar stock, such as steel.

Aluminum bar stock is produced by extruding aluminum billets through a die to create the desired shape and size. Visit us gsmoulding.com/product/aluminum-bar-stock The resulting product is a long, straight bar with a uniform cross-section, which can be cut to the desired length for use in various applications. It is available in a range of sizes and alloys, depending on the specific application.


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The impact of distance on long-distance moving costs is profound. As the distance increases, so do the expenses associated with the move. Longer moves require more fuel, resulting in higher transportation costs. Additionally, the extended travel time may necessitate overnight accommodations for the moving crew, further adding to the overall cost. Click here to visit krcaluprofiles.com/product-category/aluminum-profiles/20-aluminum-glass-door-profiles/ for more inforamtion.

The distance also influences the logistics of the move, affecting the time and effort required for packing, loading, and unloading. These factors can lead to increased labor costs.

Therefore, when planning a long-distance move, it's essential to account for the distance as a primary cost factor. Understanding this impact helps individuals and families make informed decisions when budgeting for their relocation.


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At Petrel, we pride ourselves on crafting excellence through our dedication to quality aluminum alloys. With a focus on precision and innovation, we meticulously research and develop aluminum alloys to ensure optimal performance and durability. Our personalized approach allows us to design custom molds tailored to each client's unique specifications, guaranteeing exceptional results. From casting aluminum rods to extruding profiles, we maintain the highest standards of quality throughout the manufacturing process. With over two decades of experience in the industry, we have earned a reputation for excellence and reliability. Petrel perfiles de aluminio para puertas y ventanas.Trust Petrel for superior aluminum alloys that exceed expectations, delivering unmatched performance and durability for a wide range of applications.


3/14/2024 6:36:43 AM   
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