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Ningbo Longjian Magnetsy Industry Co., Ltd. is a company engaged in various types of magnetic materials and manufacturing technology development company , The company has advanced production technology and rich experience in engineering and technical personnel , these are our customer service Guarantee .

The company adopts advanced technology , excellent equipment, can be customized according to different need of customers personalied production programs, to save costs for customers , to provide quality stablity of magnetic products.

Now our products have been widely used in various types of motors, speakers, VCM, display equipment, door and window hardware, refrigerator stickers, nuclear magnetic resonance, magnetic separator, magnetic drive, magnetic suspension, iron remover, high temperature spray, hardware tools, leather goods bags, glasses Boxes, instruments, medical equipment, communication equipment, computers, packaging boxes, electronics, handicrafts and many other industries and fields.
Ningbo Longjian Magnetsy Industry Co., Ltd. is willing to excellent quality,reasonable price , excellent service of Magnetic products with various specifications of various characteristics to customers , Mutual benefit and win-win is our pursuit of dragon !

Sintered NdFeB magnets, as one of the important substances to promote contemporary technology and social progress, are widely used in the following fields: computer hard disk, magnetic resonance imaging, electric vehicles, wind power, industrial permanent magnet motors, consumer electronics (CD, DVD) , mobile phones, audio, copiers, scanners, cameras, cameras, refrigerators, televisions, air conditioners, etc.) and magnetic machinery, magnetic suspension technology, magnetic transmission and other industries.
Since 1985, industrialization has begun in Japan, China and Europe and the United States. In the past 30 years, the global permanent magnet materials industry has flourished, and its magnetic properties have been continuously recorded. The variety of materials and grades has been increasing. With the expansion of the market, its manufacturers are also increasing, and many customers are inevitably caught in such confusion, how to judge the pros and cons of the product?
The most comprehensive judgment method: one, magnet performance; two, magnet size; three, magnet plating.
First of all, the guarantee of the performance of the magnet comes from the control of the raw material production process.
1. According to the requirements of the company to manufacture high-grade or medium-grade or low-grade sintered NdFeB, the raw materials are selected according to the national standard.
2. The advanced production process directly determines the performance quality of the magnet.
3. In terms of magnetic field orientation, China is the only country in the world that adopts two-step press molding. It is vertically molded with small pressure during orientation, and finally adopts quasi-isostatic pressing. This is one of the most important characteristics of China's sintered NdFeB industry. .
4. Moreover, the monitoring of the quality of the production process is very important, and can be controlled by the thickness measurement of the SC piece and the particle size distribution of the JM powder. 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? China Institute of Metrology has developed a variety of magnetic material measuring instruments for permanent magnet materials. Pulsed Magnetic Field Magnetometer (PFM) is a test instrument for testing ultra-high-coercive permanent magnets, mainly for the high-coercive permanent magnets required in the electric vehicle field and large permanent magnet motors.
Second, the guarantee of the size of the magnet depends on the processing strength of the factory.
The practical application of sintered NdFeB magnets is various in shape, such as wafer, cylinder, cylindrical (with inner hole); square, square, square column; tile, fan, trapezoid, polygon and various Irregular shapes, etc. Each shape of the permanent magnets has different sizes, and it is difficult to make one molding in the production process. The general production process is: the production of large (large size) billets, after sintering and tempering, and then through mechanical processing (including cutting, drilling) and grinding, surface coating (coating) treatment, and then Magnet performance, surface quality and dimensional accuracy are measured and then magnetized, packaged and shipped.
Again, the quality of the magnet coating directly determines the service life of the product.
It has been experimentally found that a 1 cm3 sintered NdFeB magnet is placed in air at 150 ° C for 51 days and will be completely oxidized and etched away. It is more susceptible to corrosion in weak acid solutions. In order to make the NdFeB permanent magnet durable, it is required to have a service life of 20-30 years, and it must be subjected to surface anti-corrosion treatment to resist the corrosion of the magnet by the corrosive medium. At present, the sintered NdFeB magnet manufacturing industry generally adopts electroplating metal, electroplating + electroless metal plating, electrophoretic coating and phosphating treatment, and an additional spacer is plated on the surface of the magnet to isolate the surface of the magnet from the corrosive medium. To prevent the media from invading the magnet.
In summary, customers can only correctly judge the eligibility of products if they understand their production processes and understand the requirements of the products. In a nutshell, it is performance control, dimensional tolerance control, coating inspection and appearance evaluation.
In terms of performance, it can be tested for Br (remanence), Hcb (coercivity), Hcj (intrinsic coercivity), (BH)max (maximum energy product) and demagnetization curve; dimensional tolerance can be performed by vernier caliper Measure the accuracy; on the coating, the brightness of the coating can be observed by the naked eye and the detection method by bonding force, salt spray experiment, etc.; the overall appearance, mainly with the naked eye or magnifying glass, or optical microscope (for products with linearity less than 0.2mm), The sintered NdFeB magnet has a smooth surface, no visible particles and foreign matter, no spots, no falling edges, and the appearance is acceptable.