How to Judge the Quality of Sintered NdFeB Magnets
As a kind of permanent magnet, sintered NdFeB magnets are widely cited in many fields, such as computer hard disk, MRI, electric vehicle, wind power, industrial permanent magnet motor, consumer electronics (CD, DVD, mobile phone). , audio, copiers, scanners, cameras, cameras, refrigerators, televisions, air conditioners, etc.) and magnetic machinery, magnetic suspension technology, magnetic transmission and other industries. Sintered NdFeB magnets play a role in promoting the advancement of contemporary technology and society in today’s society. fishing magnet
Since the global industrialization in 1985, the demand for permanent magnets in the world has increased greatly, and the permanent magnet industry has flourished accordingly. With the development of global marketization, magnet manufacturers are also increasing, and from the customer’s point of view, how to judge the advantages and disadvantages of sintered NdFeB magnets? Here we introduce three methods.
Judgment method 1: Considering the performance of magnet
How to ensure the magnetic properties of sintered NdFeB magnets must be controlled from the production process of raw materials, the manufacturing requirements of enterprises, the production process and the orientation of magnetic fields. According to the raw material composition stipulated by the national standard to purchase raw materials, according to the requirements of the enterprise to manufacture high-grade or medium-grade or low-grade sintered NdFeB. The advanced nature of the production process of sintered NdFeB magnets determines the performance and quality of the magnet. The performance of magnets made by the most advanced technology is relatively high.
Judgment method 2: Considering the orientation of the magnetic field
From the orientation of the magnetic field, China is the only country in the world that adopts two-step press molding. Orientation is carried out by small pressure vertical molding, and finally quasi-isostatic pressing. This is one of the most important characteristics of China’s sintered NdFeB industry. This is a technology that Chinese people are proud of.
Judgment method 3: observe from production process
Monitoring is also very important in the production process. It can be controlled by means of SC sheet thickness measurement and JM powder particle size distribution. High-quality products are all dependent on the control of the production process, but customers will be very confused, how to judge the performance of the products I purchased? We can use some measuring instruments to measure, to show customers that the products meet the national standards. Customers can also select the NdFeB grades they need based on the magnet parameters Br (remanence), Hcb (coercive force), Hcj (inner coercivity), and (BH)max (maximum magnetic energy product). Choose products that meet your requirements.
Secondly, the quality of sintered NdFeB magnets can be determined according to the size of the magnet. The shape of NdFeB is different according to its application. The production process is also carried out in many steps. The quality of the sintered NdFeB magnet surface is generally good. To be smooth, we must achieve a certain degree of precision.ndfeb micro permanent magnet Therefore, a qualified sintered NdFeB magnet not only needs to meet the performance requirements of the standard, but also the control of dimensional tolerance directly affects its application. The size guarantee is directly dependent on the processing strength of the factory.
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