Judging the quality of sintered NdFeB magnets?

    1. In the magnetic field orientation, China is the only country in the world that adopts two-step press molding. When judging the quality of sintered NdFeB magnets, it is formed by small pressure vertical molding, and finally quasi-isostatic pressing is used. One of the most important features of the iron and boron industry.

    2. 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. The high-quality products of strong magnets all depend on the control of the production process, but the customers will be very confused. How to judge the performance of the products I purchased? The China Institute of Metrology has developed various types of magnetic parameters measurement of permanent magnet materials. instrument. 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. Tr

        3, according to the requirements of the company to manufacture high-grade or mid-range or low-grade sintered NdFeB, according to the raw material composition of the national standard to purchase raw materials.

    4. The advanced production process directly determines the performance quality of the magnet. The most advanced technologies available today are scale ingot (SC) technology, hydrogen fragmentation (HD) technology and jet mill (JM) technology. The small-capacity vacuum induction smelting furnace (10kg, 25kg, 50kg) has been replaced by a large capacity (100kg, 200kg, 600kg, 800kg) vacuum induction furnace. SC (StripCasting) rapid solidification casting 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 grinding Machine and ball mill (wet milling) ensure the uniformity of the powder and facilitate liquid phase sintering and grain refinement.