NdFeB magnet production–melting

Sintered NdFeB is a very widely used magnetic material. It is an alloy of neodymium, iron, boron, rare earth and other materials combined. In order to prevent the impact on the basic composition of the magnet, we need to smelt the raw materials. Treatment is performed to avoid the mixing of impurities, so that the subsequent sintering melting point and shrinkage are different, and concave holes and blistering will occur in the magnet. In the processing of raw materials, it is very important to clean up the impurities covering the metal surface.

During the smelting process, the gases encountered are water vapor (H2O), hydrogen (H2), oxygen (O2), CO2, nitrogen (N2), CO, etc. These gases are either dissolved in the molten metal or chemically reacted with them. The gas can enter the alloy liquid from furnace gas, furnace lining, raw materials, flux, tools, etc.

Smelting is actually smelting, pouring, and cooling the raw materials that are proportioned as required. The smelted metal liquid is poured and stripped by the water-cooled copper roll. The cooling effect of the water-cooled copper roll directly affects the crystallization state of the strip. production also has a direct impact.

The current technology is that the molten metal is cooled by the inner circulating water of the water-cooled copper roll, so that the stripper is tightly attached to the surface of the copper roll, so that the cooling effect is very good, and the crystal structure is relatively fine and uniform.