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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium The Science of Melt Refining: An LMD Symposium in Honor of Christian Simensen and Thorvald Abel Engh
Presentation Title Overview of Ultrasonic Degassing Development
On-Site Speaker (Planned)
Abstract Scope Ultrasonic degassing attracts industrial attention as an alternative to Ar-rotary and Ar-lancing degassing, offering environmentally friendly, economical and efficient technology. This paper gives a brief historical overview of ultrasonic degassing development in the 1960s-2010s, discussed basic principles of cavitation-induced degassing and demonstrates various technological implementations of ultrasonic degassing technology in foundry and cast house. Batch versus continuous, gas- or vacuum-assisted versus purely ultrasonic variant of the technology are considered. Main advantages of ultrasonic degassing include rapid degassing without the use of a carrier gas, significantly reduced dross formation, absence of rotating brittle parts. There are also some technological issues associated with the ultrasonic degassing such as material selection of a sonotrode, requirement to process larger melt volumes with less ultrasonic sources, rapid re-gassing of hydrogen-depleted melt. The paper is illustrated mainly with own results.
Proceedings Inclusion? Planned: Light Metals


A Holistic Approach to Molten Metal Cleanliness
Developments in Inclusion Removal Technology
Effects of 2 ppm Beryllium on the Oxidation of a 5XXX Aluminum Alloy at Temperatures between 500 C and 750 C
Modelling of Hydrogen Removal in Gas Fluxing of Molten Aluminium
Overview of Ultrasonic Degassing Development
Oxide Skin Strength on Molten AA5XXX Aluminum Alloy – Effect of Beryllium and Alternatives
Results of Trials with a Multi Stage Filtration System Employing a Cyclone
The Contributions of Thorvald Engh and Christian Simensen to the Science of Melt Refining
The Fundamentals of Forming Microbubbles in Liquid Metal Systems
The Use of Nitrogen to Degas Molten Aluminium - Comparison of Metallurgical Results with Argon and Nitrogen Used in an ACD™
Understanding of Interactions between Pyrolysis Gases and Liquid Aluminum and Their Impact on Dross Formation

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