Principle of ultrasonic degassing in molten glass
The gas bubbled rise to the surface and are expelled. An alternative approach involves subjecting the melt to reduced pressure, but both processes have environmental and economic drawbacks.
During ultrasonic degassing, the microbubbles that form during the low-pressure cycle provide nuclei for the formation of hydrogen bubbles. Essentially, hydrogen diffuses to these bubbles. Assisted by ultrasonically induced acoustic flow and streaming, the hydrogen bubbles rise to the melt surface and are expelled.
Ultrasonic assisted molten glass refining can potentially be used to remove gas bubbles from molten glass at substantially lower temperatures than the standard process and, very importantly, without the need to increase processing times. As the molten glass refining process is highly energy-intensive, reducing the refining temperature provides significant energy savings.
Ultrasonic treatment of metal melts can substantially improve the properties of castings, in particular, their microstructure and mechanical properties. Recently, new refinements to the technique using proprietary ultrasound technology provide significant benefits to industrial continuous casting, offering an alternative to argon degassing, replacement of standard master alloy additives, and substantial improvements to microstructure.
Various techniques are available for enhancing the microstructure and grain refinement in aluminium alloys, magnesium, zinc, copper for instance, there is a strong correlation between grain size and casting temperature; however, significant improvements can be achieved using ultrasonic treatment. Two mechanisms contribute to this process.
Our novel ultrasonic melt treatment of aluminium melts using a cavitation frequency of 20 kHz can radically improve the microstructure of the final products. However, when combined with micro-alloying, the results are even more dramatic. Our ongoing ultrasonic microalloying project has already allowed us to create aluminium micro-alloys stronger than steel.
Sialon alternative to graphite impregnated fluxing tubes for degassing inert gases or active gases.
We offer a wide range of Sialon-gas inlet tubes for metal working. In these sectors, they find their application in Aluminum production, Brass Manufacturing and Precious metal manufacturing.
Our silicon nitride gas inlet tubes offer excellent performance and a good service life. We also offer an additional machining of the pipes for gas thread, nozzles and blind holes. Fluxing the molten metal with nitrogen is a simple and cost-effective way to ensure that the metal is gas free and avoids gas porosity; reduces the number of pores and foggy phenomena on the surface of the metal.
Fluxing the molten metal with nitrogen is a simple and inexpensive way to ensure that the metal is gas free and avoids gas porosity; reduces the number of pores and foggy phenomena on the surface of the metal.
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