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Neodymium iron boron magnet: neodymium iron boron magnet performance is found in the commercialization of the highest, known as the king has a high magnetic, magnetic to the maximum energy product (BHmax) is higher than the ferrite (Ferrite) more than 10 times. It is also commonly known as: strong magnetic, magnetic steel. Mechanical properties of its own is also very good. The work of the highest temperature can reach 200 degrees celsius. But its hard texture, stable performance, has the very good price, so its application is extremely wide. But because of its chemical activity is very strong, so must treatment on its surface.

Neodymium iron boron permanent magnetic material is a permanent magnetic material in Nd2Fe14B based intermetallic compounds. Compared with the casting Al-Ni-Co permanent magnetic materials and permanent magnetic ferrite material, NdFeB has a very high energy product and coercive force, the weight can be sucked up is equivalent to 640 times their own weight. The advantages of high energy density of the Nd-Fe-B permanent magnetic materials have been widely used in the modern industry and electronic technology, so that the instrument, electro acoustic electric, magnetic magnetization equipment miniaturization, lightweight, thin possible. The advantages of the material characteristics of neodymium iron boron is of high ratio of performance to price, with good mechanical properties, easy machining; the deficiency lies in the Curie temperature point is low, temperature characteristics is poor, and easy powder corrosion, must surface treatment method by adjusting the chemical composition and taken to make improvements, in order to meet the requirement of practical application.

The manufacturing process of neodymium iron boron by powder metallurgy technique, will contain a certain proportion of raw materials such as: Nd, Dy, iron, cobalt, niobium, praseodymium, aluminum, copper, boron iron by medium frequency induction melting furnace smelting alloy steel ingot, and then broken into 3 to 5 mu m powder and pressing in the magnetic field, green after molding and sintering in a vacuum sintering furnace and compact temper aging, so that it can obtain permanent magnet blank having a certain magnetic properties. Blank after grinding, drilling, slicing processing, and surface treated to get neodymium iron boron products required by the user.