Ultrasonic grain refining and degassing procedures and systems for metal casting including enhanced vibrational coupling
An energy coupling device for coupling energy into molten metal. The energy coupling device includes a cavitation source which supplies energy through a cooling medium and through a receptor in contact with the molten metal. The cavitation source includes a probe disposed in a cooling channel. The probe has at least one injection port for injection of a cooling medium between a bottom of the probe and the receptor. The probe under operation produces cavitations in the cooling medium. The cavitations are directed through the cooling medium to the receptor.
1. An energy coupling device for coupling energy into molten metal, said device comprising:
a vibration source comprising a probe, said probe comprising an injection port at or near a tip of the probe, the vibration source further comprising a cooling medium feed which transits an axial length of the vibration source, the vibration source configured to eject a cooling medium from the injection port to a receptor in contact with the molten metal, the receptor is spaced apart from the vibration source; and
an assembly comprising a housing and a cooling channel within the housing;
wherein the tip of the probe is inserted into the cooling channel within the housing of the assembly.
2. The device of claim 1 , wherein said injection port comprises a through hole for passage of the cooling medium through the probe.
3. The device of claim 1 , wherein said receptor in contact with the molten metal comprises a band.
4. The device of claim 1 , wherein the vibration source comprises at least one piezoelectric or a magnetostrictive ultrasonic transducer providing said energy to said probe.
5. The device of claim 1 , wherein the vibration source comprises at least one source of mechanical vibration.
6. The device of claim 1 , wherein the energy has a frequency up to 400 kHz.
7. The device of claim 1 , wherein said injection port comprises a central through hole and peripheral through holes in the probe.
8. The device of claim 1 , wherein said cooling medium comprises water, gas, liquid metal, liquid nitrogen, or oil.
9. The device of claim 1 , wherein the receptor comprises one or more of niobium, a niobium alloy, titanium, a titanium alloy, tantalum, a tantalum alloy, copper, a copper alloy, rhenium, a rhenium alloy, steel, molybdenum, a molybdenum alloy, stainless steel, a ceramic, a composite, or a metal.
10. The device of claim 9 , wherein the receptor comprises stainless steel.
11. The device of claim 1 , wherein the probe comprises titanium.
12. The device of claim 1 , wherein a tip of the probe is within 5 mm of contacting the receptor.
13. A casting mill comprising:
a casting mold configured to cool molten metal, and
the energy coupling device of claim 1 .
14. The mill of claim 13 , wherein the mold comprises a continuous casting mold.