Aluminum Magnesium Ultrasonic Degassing Of Metal Melts

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. Ultrasonic degasification of aluminum alloys raise the ultimate tensile strength and ductility of the material. Industrial power ultrasound systems count as the best amongst other commercial degassing methods regarding effectiveness and processing time. Moreover, the process of mold filling is improved due to lower viscosity of the melt.

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