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What are the methods to judge the pros and cons of NdFeB magnets:

1. Performance of NdFeB magnet:

1. Purchasing raw materials in accordance with the raw material composition specified in the national standard according to the requirements of the enterprise to manufacture high-end or mid-end or low-end sintered NdFeB.

2. Whether the production process is advanced or not directly determines the performance and quality of the magnet. At present, the most advanced technologies are scale ingot (SC) technology, hydrogen crushing (HD) technology and jet mill (JM) technology. Small-capacity vacuum induction smelting furnaces (10kg, 25kg, 50kg) have been replaced by large-capacity (100kg, 200kg, 600kg, 800kg) vacuum induction furnaces. SC (StripCasting) quick-setting cast sheet technology has gradually replaced large ingots (ingots with a thickness greater than 20-40mm in the cooling direction), and hydrogen crushing (HD) technology and jet mill (JM) have replaced jaw crushers and disc mills. The machine and ball mill (wet milling) ensure the uniformity of the powder and are beneficial to liquid phase sintering and grain refinement.

3. In terms of magnetic field orientation, my country is the only country in the world that adopts two-step compression molding. It uses low pressure vertical compression molding during orientation, and finally adopts quasi-isostatic compression molding. This is one of the most important features of my country's sintered NdFeB industry. .

4. In addition, the monitoring of the quality of the production process is very important, and it can be controlled by testing methods such as SC sheet thickness measurement and JM powder particle size distribution. High-quality products depend on the control of the production process, but customers will be very confused, how to judge the performance of the products I buy? The Chinese Academy of Metrology has developed various types of permanent magnetic material technology magnetic parameter measuring instruments. The pulsed magnetic field magnetometer (PFM) is a test instrument for testing ultra-high coercivity permanent magnets, mainly to adapt to the high coercivity permanent magnets required by the electric vehicle field and large permanent magnet motors.

2. Size of NdFeB magnet:

The practically used neodymium iron boron permanent magnets have various shapes, such as discs, cylinders, cylinders (with internal holes); square plates, squares, square pillars; tiles, sectors, trapezoids, polygons and various Irregular shapes, etc. The permanent magnets of each shape have different sizes, and it is difficult to form them in one production process. The general production process is: Mr. produces large (large size) blanks, after sintering and tempering, and then through mechanical processing (including cutting, punching) and grinding, surface coating (coating) treatment, and then Magnet performance, surface quality and dimensional accuracy are tested, then magnetized, packaged and shipped.

3. Coating of NdFeB magnet:

1. Generally, the three processes of zinc plating, nickel plating + copper + nickel, nickel plating + copper + chemical nickel plating are mainly used. Other metal plating requirements are generally applied to other metal plating after nickel plating.

2. Phosphating will also be used in some special cases:

(1) Phosphating is simple and easy to use when the neodymium iron boron magnet product is turned over and stored for too long and the subsequent surface treatment method is not clear;

(2) When the magnet needs epoxy adhesive bonding, painting, etc., the bonding force of the epoxy organic matter such as glue and paint requires the matrix to have good wettability. The phosphating process can improve the wettability of the magnet surface.

3. Electrophoretic coating has become one of the widely used anti-corrosion surface treatment technologies. Because it not only has a good bonding force with the porous magnet surface, but also has corrosion resistance such as salt spray, acid and alkali resistance, and excellent corrosion resistance. However, compared with spray coating, its resistance to humidity and heat is poor.

Shenzhen Jiamingtai Magnetoelectric Technology Co., Ltd. was founded in 2013. It is a manufacturer specializing in the production and development of various high-strength, special-shaped strong magnets and single-sided strong magnets. The factory has more than 50 sets of advanced magnet production and processing equipment, more than 10 excellent management and technical personnel, more than 40 employees, and an annual output value of tens of millions to serve high-end customer groups. Main data line magnets, electronic cigarette magnets, neodymium iron boron magnets, single-sided magnets, double-sided magnets, special-shaped magnets, packaging magnets, electronic magnets, cigarette case magnets, ring magnets, etc. The products are sold well in Shenzhen, Dongguan, Huizhou, Guangzhou, Zhongshan, Anhui, Hubei, Hunan and other places.