Ultrasonic Metal Melt Crystallization Refining Equipment

Ultrasonic Metal Melt Crystallization Refining Equipment: 

-Power ultrasound in molten metals and alloys shows various beneficial effects such as structuring, degassing, and improved filtration. 

-Ultrasonic promotes the non-dendritic solidification in liquid and semi-solid metals. 

-Sonication has significant benefits on the microstructural refinement of dendritic grains and primary intermetallic particles. 

-Furthermore, power ultrasound can be used purposefully to reduce the metal porosity or to produce meso-porous structures. Last but not least, power ultrasound improves the quality of castings.

Dendrite fragmentation: The melting of dendrites usually begins at the root due to local temperature rise and segregation. Ultrasonic generates strong convection (heat transfer by mass motion of a fluid) and shock waves in the melt, so that the dendrites are fragmented. Convection can promote dendrite fragmentation due to extreme local temperatures as well as composition variations and promotes diffusion of solute. The cavitation shock waves assist the breakage of those melting roots.

Ultrasonic Degassing of Metallic Alloys Degassing is another important effect of power ultrasonics on liquid and semi-solid metals and alloys. The acoustic cavitation creates alternating low pressure / high pressure cycles. During the low pressure cycles, tiny vacuum bubbles occur in the liquid or slurry. These vacuum bubbles act as nuclei for the formation of hydrogen and vapor bubbles. Due to the formation of larger hydrogen bubbles, the gas bubbles rise. Acoustic flow and streaming assist the floating of these bubbles to the surface and out of the melt, so that the gas can be removed and the gas concentration in the melt is reduced. Ultrasonic degassing reduces the porosity of the metal achieving thereby a higher material density in the final metal / alloy product.

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