The application of soft magnetic materials in the electrical or electronic industry has increased significantly thanks to the development of amorphous and / or nanocrystalline metallic glasses, mainly through the use of Melt Spining technology. This is a technique used for the extremely rapid cooling of metals in the liquid state, and consists in a metal wheel (represented by the flat bottom surface in this photo) that can be cooled internally with water, and that rotates at high speed underneath a thin jet of liquid metal that is thrown at high pressure and temperature over the outer surface of the wheel from a nozzle that is at a determined gap of the same. The contact with the cold and flat surface of the wheel produces a cooling that causes an extremely rapid solidification that generates a very thin ribbon, which is what is observed in the figure. The cooling rates that can be achieved by this technique are between 10 ^ 4 and 10 ^ 7 k / s and are those that cause the amorphization of these materials. Depending on their composition, they can become nanocrystallized. The turbulence involved in this reported transient lasts a few milliseconds, enough time to study the process with high-speed cameras in our laboratory.
MELT SPINNING, ENERGY, SOFT MAGNETIC MATERIALS