Clean recycling of spent nickel-based single-crystal superalloy by molten magnesium

Clean recycling of spent nickel-based single-crystal superalloy by molten magnesium

Blog Article

Nickel-based single-crystal superalloys are designed for extreme conditions due to their superior corrosion and creep resistance properties.However, these pose challenges in the subsequent recycling after reaching their end-of-life.Molten magnesium (Mg) can rapidly corrode the stable spent nickel-based superalloys and selectively dissolve nickel here (Ni).This waste-free process represents an effective method for recycling spent superalloys and accomplishing metal regeneration.This study investigates the mechanism of selectively dissolving Ni from DD5, a nickel-based single-crystal superalloy, by optimizing process temperature, time, and Mg content in an inert atmosphere.

Vacuum distillation was read more employed to separate the resulting Mg, residual superalloy (i.e., the material left post-extraction), and Ni-rich alloy (i.e., the metal product selectively extracted).

The findings revealed that the residual superalloy after selective Ni dissolution is characterized by a porous skeleton structure with pore sizes predominantly ranging from 2 to 30 nm and a low compressive strength which is 1/10 of the original DD5 superalloy.