Bonded magnets appeared in 1970s, when the SmCo was already commercialized. Market condition of sintered permanent magnet is vigorous, but due to the difficulty of precision machining it into a special shape, and issues of cracking, corner and edge breakage, and problems in assembling, its application is limited. To solve the above problems, China manufacturers crashed the magnet, mixed it with plastic, and pressed it in magnetic field, which is probably the original manufacturing method of bonded magnet. Bonded NdFeB magnets have been widely applied for its various advantages, such as, low cost, high dimensional accuracy, high flexibility of shapes, good mechanical strength, light weight and so on, annual growth rate of which is up to 35% now. Since the appearance of NdFeB magnetic powder, the flexible bonded magnets have developed rapidly because of the high magnetic properties.
Advantages: high remanence, high coercivity and high energy product, high performance price ratio, high flexibility in size and minimum dimensions.
Sintered Neodymium Iron Boron
Based on the strength of magnetism and the coercivity, sintered neodymium permanent magnet material is decided into low coercive force N, middle coercivity M, high coercivity H, super high coercive force SH, ultra high coercivity UH, extra high coercive force EH, all together six types.
Production of sintered neodymium iron boron magnets is started with a powder metallurgy process. Smelted alloy will be made into powder and then pressed in magnetic field into blanks. Pressed blanks will be densified in inert gas or vacuum sintering. Last, in order to improve the coercivity of the magnet, aging heat treatment will usually be applied by China factories.
Sintered neodymium magnet material, with its excellent magnetic properties, are widely used in electronics, electrical machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. Most common products include permanent magnet motors, speakers, magnetic separators, computer magnetic disk drives, magnetic resonance imaging equipment, etc.
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