NdFeB magnet is one of the permanent magnets. It has extremely high coercive force hc, maximum magnetic energy product and residual magnetism br. It has very good magnetic stability and is much lighter than flux magnets, so it has a very wide range of applications. , involving almost all walks of life.
In daily production, the price of NdFeB ranges from one hundred to several hundred, depending on the root sowing processing technology. In daily production, there are generally three production processes commonly used for NdFeB magnets, namely sintering process, bonding process and injection molding process. Let's take a closer look at the connotation of these processes.
The sintered NdFeB magnet process is to grind the magnetic material into powder by airflow, and then smelt it into a whole material of specified specifications in a smelting furnace. The NdFeB magnets produced by this process have very high coercive force, and It has more than ten times more inverse energy product than ordinary ferrite. The price of NdFeB produced by this type of process is relatively standard and will not differ much. After it is produced and formed, it can be cut into products of different shapes as needed, but its surface has relatively high chemical activity, so it must be electroplated on the surface. Commonly used is zinc plating and nickel plating.
Compared with the bonded NdFeB magnet process and the sintering process, the price of the finished NdFeB magnet is higher, mainly because it is formed in one piece and completed in one operation, without the need for other cutting operations. It is made by combining the NdFeB The powder is mixed with some other materials and the permanent magnets are made through techniques such as compression, extrusion or injection molding.
Injection molding NdFeB magnet technology is the most demanding of all processes. The NdFeB produced by this technology is the most expensive. It requires extremely fine and precise molds, and the NdFeB powder is not put into it to make finished products with complex shapes. Most of the finished products are very thin.