neodymium magnets are also known as NdFeB or Neo magnet,the most widely used type of magnet is a strong magnet which is made from Neodymium,Iron and Boron, the chemical formula is Nd2Fe14B.
     neodymium magnets are the strongest type of permanent magnets, they have replaced other types of magnets. NdFeB was discovered in 1982, there are two important ways to produce neodymium magnet:
    1) sintered magnet process or classical powder metallurgy
    2) bonded magnet process or rapid solidification
    Sintered Neo magnet is prepared by raw materials which are melted in a furnace, then casted into a mold and cooled to form ingots. The ingots are milled to very small particles, then undergo a process of liquid period sintering. the powder is magnetically arranged into dense blocks. the blocks are then heated, cut into many different shapes, surface coated with Zinc, Copper-Nickel-Copper or other coating. the last step is magnetize.
    Bonded Neo magnet is prepared by melt spinning a thin ribbon of the neodymium alloy. This ribbon is then pulverized into particles, mixed with a polymer and compression or injection molded into bonded magnets.There are almost 5,500 tons of bonded Neo magnets are produced each year. neodymium magnets are graded by their maximum energy product which relates to the magnetic flux for each volume.
    Grades of neo magnets:
    N35~N52, 33M~48M, 30H~45H, 30SH~42SH, 30UH~35UH, 28EH~25EH
     neodymium magnets can be used in many areas: such as computer hard discs, magnetic guitar pickups, door security, loudspeakers and headphones, motors, lifting and seperators.Recently, there's a new ways to use magnet, such as children's magnetic toys, magnetic jewelrys, magnetic puzzles, for children-safety concerns, some small sizes of magnets are forbidden to make children's toys. and neodymium magnets are also be used in medical field, for example magnetic resonance imaging(MRI) scanners to image the body,this machine is very useful to help doctors to verify the situation of the patients. What's your aim to use magnets?