accueil Materials Neodymium-Iron-Boron

—————————————    NEODYNIUM-IRON-BORON MAGNETS    —————————————

Neodymium Iron-Boron magnets are sintered magnets composed of Neodymium, iron and bore powder. A nickel, zinc or epoxyd coating is necessary to protect this material against corrosion (due to agressive environment). Density 7,5.


Magnetic force is optimal when the magnet is in contact with a mild steel frame, flat, clean and rather thick. It is lower with allied steels and cast iron (less 30% for cast iron).
 It is lower in presence of an air gap (space between the part to magnetize and the polar face of the magnet).
 It is decreasing by 0.22% every degree C by propitious circuits (see besides curve).


 The maximum value of induction in surface at 20°C is about 5000 Gauss for Neodymium Ferbore flat pot magnets.
 This value is decreasing by 0,22% every degree C when temperature is increasing


These ceramics are very fragile.
They must be handled carefully.
To avoid magnets attraction during handling we advise to put them on a mild steel plate.
Do not shock or squeeze.


▶ Maximal working temperature is about 80°C, because of Hcj sensitivity to temperature (0.66% every degree C).
The induction losses are reversible so far we stay in the limit of working temperature of the material. It is 80°C in open circuit with standard grade. There are several NdFeB grades up to 180°C.

Would you like to know more about the composition, main characteristics, and applications of Ferrites magnets ? Clik here 
We also invite you to consult our catalogue products.
Neodymium Iron-Boron magnets have the highest magnetic energy (BH Max) at room temperature.
There are a lot of various grades according to different working temperatures.
The grade most used for our standard magnets available in this catalogue is N35 (max. 80°C working temperature).
Nuances N35
Br Typique (T) 1,21
Hcb Typique (kA/m) 890
Hcj Typique (kA/m) 955
BH max Typique (kJ/m³) 279
80°C maximum

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