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Ultrasonic Degassing molten aluminium

Ultrasonic Degassing in Molten Aluminium, Zinc, Magnesium, Copper, Glass and steel

Grain refinement, micro-alloying up to 1,800 Celsius

Ultrasonic degassing & grain refinement of metal melts up to 1,800 ° C, 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.

Here we will look at the mechanisms that underlie ultrasonic liquid metal interactions, in particular how they apply to ultrasonic degassing and grain refinement. Finally, we will look briefly at our ultrasonic technology as applied to industrial continuous casting.

Various techniques are available for enhancing the microstructure of aluminium alloys, 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.

During the high-pressure cycle of the cavitation process, collapsing bubbles result in localised high temperatures and pressures. Temperatures can exceed 1000 K while pressures can exceed 400 MPa;  rapid cooling rates also occur. The effects of this are twofold: many nucleation sites are formed inducing finer grain sizes, and the energies generated destroy dendritic structures that would otherwise form.  

Global Specialists in Ultrasonic degassing of molten aluminium, magnesium and glass!

With our new generation of high power NIMA ultrasonic generators, we are now able to treat large volumes of molten aluminium, magnesium, glass and other ferrous melts up to 1800 degrees Celsius. It is all about the choice of our next generation low frequency generator AND a new generation of in-house developed ceramics with non-wetting properties with a very high Young's Modulus Elasticity!

Other Applications

Other applications include use in the chemical, process, oil and gas industries due to the excellent chemical stability, corrosion and wear resistance properties. In metal forming, Sialon ceramics are used as cutting tools for machining chill cast iron and to braze and weld fixtures and pins, particularly for resistance welding.

Smooth Finish of Products

Our heater tubes, thermocouple protection tubes, riser tubes, Westofen dosing tubes, ladles, hooks, extrusion dies, cutting tools and welding pins have excellent non-wetting properties and a smooth surface.

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