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Explain The Production Process Of Neodymium Magnet

Oct. 25, 2019

Although there are many manufacturers of NdFeB magnets, the price is also uneven, but a penny of goods depends on the customer's choice. The following section of the Segment Neodymium Magnet Supplier will briefly introduce the production process of the neodymium magnet.


1. Raw material preparation and pretreatment:

Process Description: Pretreatment of raw materials such as weighing, crushing, breaking and derusting. 

Process equipment: steel cutting machine, drum polishing machine, etc.

Concrete Magnet



Concrete Magnet

2, smelting:

Process introduction: The raw materials after pretreatment, swarf, pure iron, boron iron, etc. are proportioned, added to the vacuum melting furnace, and smelted under high temperature smelting under the protection of argon 4 gas. The product composition is uniform, the degree of crystal orientation is high, the structure consistency is good, and the process equipment: vacuum melting furnace.


3, hydrogen explosion:

Process Description: Hydrogen explosion (HD) process is to use the hydrogen absorption characteristics of rare earth intermetallic compounds. The niobium alloy is placed in a hydrogen atmosphere, and hydrogen enters the alloy along the thin layer of the rich antimony phase, causing it to expand and burst and break. Cracking at the plutonium layer ensures the integrity of the main phase grains and the intergranular boundaries. The HD process makes the crepe of the crucible very loose, greatly improving the milling efficiency of the jet mill and reducing the production cost. 

Process equipment: vacuum hydrogen treatment furnace.


4, milling:

Process Description: Airflow milling powder is pulverized by high-speed collision of the material itself. It has no wear and no pollution to the inner wall of the grinding chamber, and can prepare powder with high efficiency. 

Process equipment: jet mill.


5, molding orientation:

Process Description: The role of orientation is to make the easy magnetization direction of the chaotically oriented powder particles c-axis to the same direction, so as to obtain the maximum remanence. The main purpose of the molding is to compress the powder into a shape and size while maintaining the degree of grain orientation obtained in the magnetic field orientation as much as possible. We design a shape magnetic field press and an isostatic press for secondary molding. For special-shaped magnets, special mold tooling is used for direct molding. The sintered magnets can be put into use only with a slight surface treatment, which greatly saves materials. And subsequent processing costs.

Process equipment: magnetic field press, isostatic press.


6, sintering:

Process Description: Sintering is a series of physicochemical changes that occur at high temperatures. It is a simple and inexpensive way to change the microstructure of materials to improve the magnetic properties of materials. Sintering is the final forming process of the material and has a very important influence on the density and microstructure of the magnet.

Process equipment: vacuum sintering furnace.


7. Mechanical processing:

Process Description: The neodymium magnets obtained after sintering are blanks that require further machining to obtain products of various sizes, sizes and shapes. Due to its brittleness and poor mechanical properties, Segment Neodymium Magnet can only be used for grinding and cutting.

Process equipment: surface grinder, double grinder, chamfering machine.


8, surface treatment:

Process Description: Surface treatment of various shapes of rare earth permanent magnets, such as electrophoresis, galvanizing, nickel, nickel-copper-nickel and phosphating, to ensure the appearance and corrosion resistance of the product.


9. Finished product inspection and packaging:

Process introduction: Test various magnetic properties, corrosion resistance, high temperature performance, etc. of the product, and package it after reaching the standard to meet various needs of customers.


Finally, if you want to buy a neodymium magnet, you can come to us, we can provide you with a variety of magnets including Concrete Magnet, welcome to buy.

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