Samarium Cobalt (SmCo ) Technical Information
| Magnetic Characteristics | 1820 | 2620 | |
| Residual Induction Br |
(kG) Typical |
8900 | 10400 |
|
(mT) Typicical |
890 | 1010 | |
| Coercive Force Hc | (kOe) Typical | 8600 | 9500 |
| (kA/m) Typical | 685 | 755 | |
| Intrinsic Coercive Force Hcl | (kOe) Typical | >20 | >20 |
| (kA/m) Typical | >1600 | >1600 | |
| Maximum Energy Product BHmax | (MGOe) Typical | 19 | 25.5 |
| (kJ/m³) Typical | 150 | 205 | |
| Magnetic Characteristics | 1820 | 2620 | |
| Density | (lb/in³) | .303 | .296 |
| (g/cm³) | 8.4 | 8.2 | |
| Curie Temperature | °F | 1328 | 1472 |
| °C | 720 | 800 | |
| Recommended Maximum Operating Temperature | °F | 482 | 662 |
| °C | 250 | 350 | |
Manufacturing Processes
Neodymium Iron Boron and Samarium Cobalt are produced by compacting a finely milled metallic powder in the presence of an electromagnetic alignment field. Magnets produced in this manner are anisotropic, and will exhibit a preferred direction of orientation when magnetized. The "green" compacted part is sintered and heat treated in a controlled inert gas atmosphere to achieve full density and optimize the magnetic properties. Final shaping of the magnet is accomplished by grinding with diamon abrasives. Normally these magents are ground only on the pole faces, all other surfaces would exhibit as pressed dimensions and surface conditions.
Temperature Characteristics
If the Neodymium and Samarium Cobalt materials are required to operate at temperatures other than ambient, consideration must be given to the effect on the magnet's performance. Normally operating below 20°C causes no adverse effects, and in fact performance increases with decreasing temperatures. The Neodymium materials do exhibit a temporary, or reversible loss of flux with increasing temperatures. The severity of these losses and the possiblity of permanent, or irreversible losses must be considered when the design is being developed. The grade of material, temperature extremes, magnet geometry, and circuit configuration will all influence the ability of a given device to withstand adverse thermal conditions without experiencing unexpected losses. Please consult the individual product data sheets for specific temperature data, or consult our application engineering department for additional information.
Physical Characteristics
Neodymium magnets are stronger mechanically than most other permanent magnet materials. Even with this improved mechanical strength they should not be considered as structural components, and should be handled with some care to minimize any possible chipping or breakage. Minor imperfections such as chips, surface porosity, or other similar characteristics can occur with any permanent magnet material. These imperfections will not effect the magnet's performance, and should not be considered cause for rejection. Duramag will work with you to develop a mutually agreed upon visual inspection standard to insure that only acceptable physical characteristics are present in any parts we supply. The high iron content of Neodymium makes it prone to oxidation. Depending upon the environment in which the magnet is destined to operate, a variety of coatings or surface treatments may provide adequate protection from corrosion.