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NdFeb Magnets
Oct 30, 2018

The super strong NdFeB magnets have a higher Maximum Energy Product, typically stated as (BH)max, than Sm-Co magnets. (BH)max of NdFeB can easily reach 30 MGOe and even goes up to the super strong 52 MGOe. NdFeB magnets can replace SmCo magnets in most cases, especially where operating temperature are less than 176 degrees Fahrenheit. The temperature stability of NdFeB is not as good as SmCo magnets. Magnetic performance of NdFeB magnets will deteriorate rapidly above about 176 degrees Fahrenheit. Compared to SmCo magnets, the corrosion and oxidation resistance of NdFeB is relatively low. Sintered NdFeB permanent magnets are made with several steps. At first, a NdFeB alloy is formulated based on upon the desired properties of the final neodymium magnet product that it’s supposed to reach. The alloy is produced in a vacuum furnace and then crushed into a powder form. Sintered NdFeB permanent magnets are formed by powder metallurgical process. These magnets can be die pressed or isostatically pressed. During the pressing process, magnetic fields are applied with the assistance of specially designed processes that align the magnetic "domains" of the material and optimize the magnetic performance of these super strong magnets. The pressed magnets are then placed into a furnace under special atmospheric conditions that are conducive for achieving the desired result of a strong magnet. After sintering, the shape of the magnet is rough and barely resembles the appearance of the finished product, and need to be machined and ground into shape to achieve desired shape and size. A surface coating is usually applied on NdFeB magnets, with Zinc or a triple layer nickel-copper-nickel coating commonly used as protectives layers. Other materials such as cadmium chromate, aluminum chromate, tin or polymer (epoxy) are also used for this purpose. Both NdFeB and SmCo magnets can be made either in sintered or polymer-bonded magnets. The polymer (such as epoxy)-bonded magnets can be produced with close tolerances off tool, with little or no finishing required. Sintered magnets usually require some finishing operations in order to hold close mechanical tolerances. Sintered magnets however typically are much stronger and are more durable than bonded magnets and are the ideal choice for people who need strong magnets.


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