REN | GEN
MATERIAL TYPE
Metallic Alloy
SURFACE PROTECTION
NiCuNi / Zinc / Epoxy / Passivation / Rilsan / Aluminum / Parylene
ORIENTATION
Axial / Diametral / Radial
MAGNETIZATION
Single or multiple poles on the functional surface
Sintered NdFeB HRE-free magnets are high-performance permanent magnets characterized by a very low concentration of heavy rare earth elements (HRE), specifically below 0.1%.
Despite the reduced HRE content, these magnets maintain strong magnetic properties, excellent thermal stability, and reliable performance across a wide range of industrial and technological applications. They provide an effective and versatile solution for demanding environments where both efficiency and durability are critical.
Two configurations are available for HRE-free content up to grade REN52SH:
The table below summarizes the current HRE-free magnet grades that are commercially available, as well as those still under development.
| Br TEMPERATURE COEFFICIENT* | % / °C | -0,10 / -0,12 |
| HcJ TEMPERATURE COEFFICIENT* | % / °C | -0,40 / -0,78 |
*The temperature coefficients are nominal reference values only. They can vary for different temperatures and don’t need to be linear.
**The maximum operating temperature depends on the magnet shape, size and on the specific application. Maximum working temperature data shown on the catalogue are based on the international standard B/H = Pc > 0,7.
| CURIE TEMPERATURE | °C | 310 |
| RECOIL PERMEABILITY | (μr) | 1,05 |
| SATURATION FIELD | kOe | 30-60 |
| ELECTRICAL RESISTIVITY | Ω m | 150×10^-8 |
| COMPRESSIVE STRENGTH | N/mm2 | ~ 1.050 |
| DENSITY | g/cm3 | ~ 7,5 |
| FLEXURAL STRENGTH | N/mm2 | 250 |
| TENSILE STRENGTH | N/mm2 | 75 |
| VICKERS HARDNESS | HV | ~600 |
| YOUNG’S MODULUS | N/mm2 | 160×10^3 |
| SPECIFIC HEAT | kcal/kg/°C | 0,12 |
| THERMAL CONDUCTIVITY | kcal/m/hr/°C | ~ 7,7 |
| THERMAL EXPANSION COEF c | 10-6/ °C | -1,5 |
| THERMAL EXPANSION COEF // c | 10-6/ °C | 5 |
