Molded/bonded magnets are made by mixing magnetic powders with nonmagnetic binders. They are made into intricate shapes by either injection molding or compression bonding. Molding avoids additional machining and assembly cost. It reduced per part cost in large volumes but needs high tooling cost investment. They use Neo, Samarium, or Ferrite magnetic powders. Those made of Ferrite are inferior to others. Their magnetic strength is reduced by the binding agent. Injection Molded magnets are limited to 6 MGOe. Bonded magnets can go up to 13 MGOe. Their residual flux density ranges from 0.6 to 1T. Their service temperature ranges from 100 to 220 C.
PMAG Database Folder CM for Molded magnets lists 554 B(H) Demagnetization Curves of 49 grades, produced by 19 manufacturers worldwide. For names of all these grades, please click ‘Magnets List’ on the home page.
Please review the ‘Magnets Handbook’ (on the home page) for more technical information on these materials. Version 2 contains several less-known facts on the demagnetization of magnets. They will help you to better utilize these magnets in your machine.
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