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Magnetic Han Xiaobian takes you to understand the raw material composition of NdFeB permanent magnets


As we all know, the third-generation rare earth NdFeB permanent magnet is the most powerful magnet in contemporary magnets and is widely used. Its main raw materials are: metal neodymium, pure iron and boron-iron alloy. In order to improve the coercivity, an appropriate amount of metal dysprosium ( Sometimes aluminum, cobalt, praseodymium, dysprosium, terbium, gallium, etc. are added.) The general expression is: RE2TM14B (RE=Nd, Pr, Dy TM=Fe, Co).

What is the proportion of NdFeB raw materials?
1. Rare earth metal neodymium accounts for 29%-32.5%;
2. The metallic element iron accounts for 63.95-68.65%;
3. The non-metallic element boron accounts for 1.1-1.2%;
4. A small amount of dysprosium is added to account for 0.6-1.2%;
5. Niobium accounts for 0.3-0.5%, and aluminum accounts for 0.3-0.5%;
6. Copper accounts for 0.05-0.15% element;

The quality of these raw materials will be directly related to the magnetic properties of NdFeB permanent magnets.
Now many manufacturers are also supplying us with NdFeB strong magnets, but due to their different production capacity and processing methods, the proportion of ingredients is still slightly different.
A large number of microstructure observations show that the alloy microstructure of NdFeB permanent magnet series has the following characteristics:
(1) The grains of the matrix phase (main phase) are polygonal;
(2) The B-rich phase exists in the form of isolated blocks or granules;
(3) The Nd-rich phase is distributed along the grain boundary or grain boundary coupling;
(4) In addition, there are other impurities, oxide phases and voids in the matrix.
Shanghai Cihan Electronic Technology Co., Ltd. was founded in 2001, specializing in the production and sales of magnetic materials, with automatic slicing machine, wire cutting, drilling machine, grinding machine and other processing equipment. It can process magnetic components of various shapes and specifications such as round, square, drilling, sleeve, tile-shaped, fan-shaped, trapezoidal and so on. Special attention is paid to combining the actual situation of each customer, and tailor-made suitable magnetic equipment for customers (such as iron remover, magnetic frame, magnetic rod, NdFeB permanent magnet, magnet components, etc.).