15 x 10 x 5mm NdFeB Rectangular Magnet N40M Ni, Rare Earth Super Strong Sintered NdFeB Block Magnet for Motor Sensor Rotor Toy, Nickel Coating Licensed Neodymium Permanent Magnets China Supplier 15 x 10 x 5mm NdFeB Rectangular Magnet N40M Ni Technical Specifications: Item: NBN40M-15-10-5 Grade: N40M Material: Neodymium (NdFeB) Plating: Nickel Shape: Block, Rectangular, Rectangle, […]
Neodymium-Iron-Boron Segment Countersunk Motor Magnets, Regular Sintered Neodymium Countersink Permanent Magnets for high performance motors, DC / AC Motor Accessories Industrial High corrosion resistant Neodymium Magnets made in China Exporter
Neodymium-Iron-Boron Segment Countersunk Motor Magnets
REFeB or NdFeB magnets have only been developed recently and consist of the rare earth neodymium, iron and boron. Energy products, which are up to 40% above currently known and used metallic magnets, can be produced using this combination of materials. Permanent magnets made from Neodymium-Iron-Boron alloys enable the realisation of new technological solutions and the reduction of the utilisation of magnetic materials with the same performance level of the system and also provides the possibility of miniaturising the whole system. In contrast to SmCo magnets, the raw materials for NdFeB magnets are more readily available as the content of neodymium in rare earth ores is substantially higher than that of samarium.
Neodymium magnets can be divided into three main groups:
1.Regular Neodymium Magnets
2.High corrosion resistant Neodymium Magnets
3.Bonded Neodymium (Isotropic): Manufactured by the injection of plastic material and Neodymium into a mold. This production method yields a very precise magnet which does not require further grinding and does not suffer substantial current loss.
Advantages and Disadvantages of NdFeB Permanent Magnets / Neodymium Segment Countersunk Magnets for Motor
1) Is the strongest magnetic of permanent magnets, has the high energy (BH value) and good coercive force.
2) Manufacturing by the the vacuum sintering process, process maturity;small dimensions,have the good performances and prices; energy (BH value) of NdFeB magnets is more than ten times higher than Ferrites, it is the strongest magnetic materials in the world today, have “magnetic king”reputation.
3) Using the cutting process after sintering,according to the requirements,by the rapid processing, they can be cutted into square,disc.,ring,segment(like tile shape),and so on;Dimension tolerance is commonly +/-0.05mm,if special request,it can be controlled within 0.05mm range by increasing grinding; If requesting the higher process,using the fast quenching scales manufacturing Nd-Fe-B binding NdFeB1988,the repumag of dimensions can be reached 0.01mm,but because the organic binder content cause the low energy product,and the much higher cost of forming dies.
4) NdFeB permanent magnets are easy to be rusted/oxided, so their surface should be done eletroplating treatment, such as galvanized(Zn coating), Nickel+copper+nickel, and so on, generally, it requests more than 48hours in Salt-spray test; also can be passivated treament to slow down its oxidative speed; if using the vacuum plating aluminum + electrophoresis epoxy resin, it can go through more than 96hours in Salt-spray condition.