Sintering Technology Of Sintered NdFeB Magnets

- May 15, 2018 -

To make a neodymium magnet, it is necessary to first crush the alloy containing the necessary materials into fine particles, aggregate the particles and shape them, and then perform sintering. Then cut to the required size to complete. This process always feels like making cakes. Of course, it is not so simple to actually mass-produce high-quality neodymium magnets. It is not only necessary to unify the particles to a size of 3 to 5 μm, but also to pay attention to the uniformity of the shape, and also to consider the heating method at the time of sintering, and it takes a lot of work to manufacture. For example, the "molding process in a magnetic field" after crushing the alloy to 3 to 5 μm is one of them. This step is to align the pulverized fine powder (micromagnets). The orientation here means that the direction of magnetization of the fine powder is unified to a certain fixed direction, and the higher the orientation, the greater the residual magnetic flux density. In carrying out this step, the fine powder is first filled in a mold, a fine magnetic powder is oriented by applying a strong magnetic field, and then a pressure molding process is performed.

To achieve high orientation, it is also important to create a uniform magnetic field inside the mold. Since the arrangement of the electromagnet and the size, shape, and material of the mold all cause the magnetic field to be uneven, resulting in deterioration of the orientation, it is necessary to perform fine adjustment using a magnetic field analysis or the like to make the magnetic field uniform.

On the issue of the manufacture of neodymium magnets, as many reports say, there is no way to talk about leaving China. This is because most of the Dy in the magnets is mined in China, but China has begun to restrict exports.

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