Introduce：
Pores are an important defect in aluminum castings, which can reduce their mechanical properties, including fatigue resistance. For example, the solubility of hydrogen in liquids is higher than in solids, so hydrogen will precipitate from the liquid during the solidification process, forming pores. In order to obtain high-quality castings, dissolved hydrogen must be removed from the molten metal before it solidifies. Ultrasonic degassing in molten aluminum has many advantages, including relatively low cost and minimal environmental impact.
Ultrasonic metal melt equipment is also very effective in eliminating bubbles in metal melt. Under the action of ultrasonic waves, the speed of bubble discharge is greatly accelerated, thereby significantly improving the quality of metal. We can control the effect of ultrasonic waves by controlling the amount of metal melt, the output power of the ultrasonic generator, and the duration of ultrasonic waves, and find the balance point between ultrasonic waves and actual effects.
Principle:
Ultrasonic waves have a significant effect on the expulsion of gases from metal melt, and the elastic vibration of ultrasonic waves can completely remove gas from the metal melt within a few minutes. When ultrasonic vibration is introduced into a molten metal, cavitation occurs due to the rupture of the continuity of the liquid phase, resulting in the formation of voids and the concentration of gases dissolved in the molten metal. The elastic vibration of ultrasonic waves promotes the generation of bubble cores and causes them to continuously grow until they reach a size that can be smoothly discharged from the molten metal.
Effect:
Degassing: Ultrasonic waves have a significant effect on the removal of gases from metal melt, and the elastic vibration of ultrasonic waves can completely degas the metal melt within a few minutes. When ultrasonic vibration is introduced into a molten metal, cavitation occurs due to the rupture of the continuity of the liquid phase, resulting in the formation of voids and the concentration of gases dissolved in the molten metal. The elastic vibration of ultrasonic waves promotes the generation of bubble cores and causes them to continuously grow until they reach a size that can be smoothly discharged from the molten metal.
