SmCo Manufacturing Methods

SmCo Manufacturing Methods

SmCo magnets are manufactured in the following forms:

Sintered – fine SmCo powder is compacted in a die and then sintered, fusing the powder into a solid material. There are two forms of pressing – die pressing (which involves a hard die into which the powder is placed and then pressed), and isostatic pressing (involving a special “rubber” die into which powder is placed and then pressed with equal force in all directions on the powder). Die pressed parts are smaller than isostatically pressed parts. Although the magnetic properties of isostatically pressed parts are higher, the uniformity of magnetic characteristics is usually lower than that of die pressed parts. Sintered parts usually need some finish machining in order to meet final tolerances.

SmCo Manufacturing Methods

Compression Bonded – this is a technique whereby a special form of SmCo powder is blended with a plastic carrier material, die pressed and then heated. Parts made in this way can be of complex shapes and come off the tool with close tolerances, requiring no further finish machining. They have lower energy products than sintered materials – currently in the range of 15 MGOe.

Assemblies

Assemblies can be fabricated by adhering magnets with adhesives to suit a range of environments, by mechanically fastening magnets, or by a combination of these methods. Due to the relatively brittle nature of these magnet materials, press fits are not recommended.

When multiple magnets are assembled in repelling positions, it is advisable to use mechanical fastening in addition to adhesives, since if adhesives were to give way, repelling magnets may dislodge and endanger personnel using them. Our design engineering team will be happy to assist you in designing housings for your magnet assemblies.

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