Daido Electronics Co., Ltd. (DEC) has released high performance radially oriented Nd-Fe-B small ring magnets. Hot formed Nd-Fe-B magnet generates more than 10 times strong magnetic field of Ferrite magnet. The production process utilizes thermo-mechanical alignment during hot extrusion where mechanical deformation at an elevated temperature induces a crystallographic alignment and thus radially magnetic alignment of submicron size Nd2Fe14B grains, which is quite different from conventional sintered magnets where magnetic field alignment is used. This unique alignment process allows us to go beyond the limitation of field alignment; smaller diameter and large length to diameter ratio magnets can be produced with high uniformity. This type of fully dense magnets offers certain advantages over more widely available sintered Nd-Fe-B magnets. Nano-scale melt-spun microstructure without porosity has a greater environmental stability, together with the ability to be formed into intricate near-net shapes with highly anisotropic magnetic properties.

One particular application where hot formed magnets, in this case radially oriented hot extruded ring magnets, have a significant advantage over sintered magnets is high performance precision motors, such as servo motors and EPS (Electric Power Steering) assemblies where high uniformity of magnets and resultant low cogging are required. Daido Electronics has been successfully producing these radially oriented ring magnets for more than 17 years.

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