The formation of non dendritic structures during solidification of the metal melt can affect material properties such as strength, ductility, toughness and / or hardness. Ultrasonic induced grain nucleation: acoustic cavitation and its strong shear force increase the nucleation position and number in the melting process. Ultrasonic treatment (UST) of the melt leads to heterogeneous nucleation and dendrite fragmentation, which significantly improves the grain refinement of the final product.
Ultrasonic cavitation leads to uniform wetting of non-metallic impurities in the melt. These impurities become nucleation sites, which is the starting point of solidification. Because these nucleation points are produced before the solidification front, the growth of dendrites will not be induced. Dendrite Breakup: dendrite melting usually begins at the root due to local temperature rise and segregation. Strong convection (heat transfer by mass movement of fluid) and shock wave are produced in melt, which makes dendrite structure broken. Due to the extreme local temperature and composition changes, convection can promote dendrite fragmentation and solute diffusion. Cavitation shock waves contribute to the fracture of those melted roots.
Advantages of ultrasonic in metal melt：
-Power ultrasound highlights various beneficial effects in the treatment of molten metals and alloys, such as structuring, degassing and improved filtration.
-Ultrasonic promotes non dendritic solidification of liquid and semi-solid metals.
-Ultrasonic treatment can significantly promote the refinement of dendrites and primary intermetallic compounds.
-In addition, power ultrasound can be used purposefully to reduce metal porosity or to generate fine pore structure.
-Finally, the quality of casting is improved by high power ultrasonic.
Parameters:
1. Frequency: 20Khz
2. Power: 500W-3000W
3. Processing temperature 550 ° C -800 ° C
4. Diameter of Horn: φ30*126mm; φ50*350mm
5. Voltage: 120V-240V 50/60Hz
6. Cooling of transducer: High speed fan
Main applications of industrial ultrasonic aluminum melt processing system:
1. High-strength aluminum alloy and magnesium alloy casting;
2. Aluminum, magnesium alloy bar and sheet production;
3. Various alloy materials, motor rotors and other crystal degassing;
4. Various metal matrix composite materials, high strength aluminum alloy piston casting;
5. High-energy ultrasonic, ultrasonic treatment, ultrasonic metal treatment, ultrasonic grain refinement, ultrasonic metal solidification, ultrasonic melt defoaming, ultrasonic crystallization, ultrasonic acoustic cavitation, ultrasonic casting, ultrasonic solidification structure, ultrasonic metal continuous casting.
Hot Tags: ultrasonic melt treatment system, China ultrasonic melt treatment system suppliers, manufacturers, factory
