Ultrasonic systems are applied in numerous industries – their cost-efficiency, effectiveness and eco-friendliness are the vital aspects giving the technology a massive popularity boost. Mentioned below are the most common spheres of ultrasonic use according to Hilsonic, one of the leading ultrasonic cleaner manufacturers in the UK and the company deeply involved in ultrasound technologies development.
The impact of sonication on melt significantly increases the intensity of the formation of bubbles of dissolved gas, and as a result, its content can be reduced by two times or even more, even if sonication is not prolonged. The occurrence of gas bubbles in the melt is followed by flotation of scattered hard nonmetallic inclusions, which increases the density of the casting and melt flowability, enabling to penetrate into the smallest recesses of the mold. Further degassing, there is a significant decrease in the grain, which results in further improvement of physico-mechanical properties of the casting. Melt treatment is usually performed immediately before casting and may be carried out both in a stationary volume of the furnace or mixing bucket using a submersible radiator with a working tool of refractory materials, and by ‘scoring’ the metal in the channel by means of a special tray or using a multi-layer filter screen of glass that provide, besides ultrasonic degassing, filtering the melt. The technology is applicable to a low-density low-melting metals and their alloys.