Bonded Neodymium Iron Boron Magnets

Bonded Neodymium magnets are made of the powerful Nd-Fe-B material mixed into an epoxy binder. The mix is approximately 97 vol% magnet material to 3 vol% epoxy. The manufacturing process involves combining Nd-Fe-B powder with an epoxy binder and compressing the mixture in a press and curing the part in an oven. Since the material is formed by compression bonding, the dimensions typically vary .002″ or better for a given run.

Bonded Nd-Fe-B material is isotropic, so it can be magnetized through any direction, including multi-polar arrangements. Because the material is in an epoxy binder, it can be machined on a mill or lathe. However, the material will not support a thread, so holes cannot be tapped. Bonded Nd-Fe-B material is often used to substantially reduce the size of designs that used ceramic magnet materials. Significant size reductions can be achieved because the material is approximately three times stronger than ceramic magnet material. In addition, since the material is isotropic, it can be magnetized multi-polar, such as a N-S-N-S pattern on the outer diameter of a ring.


Grade
Max Energy Product
Residual Induction
Min Intrinsic Coercivity
Coercivity
Max Operating Temp
Curie Temp
Coefficient Induction 20-150°C
 
BHmax
Br
Hci
Hc
Tmax
Tc
α
 
MGOe
kG
kOe
kOe
°C
°C
% / °C
BN0406
4
3.0-4.0
6
3.0-4.0
160
300
-0.11
BN0607
6
4.0-5.0
7
3.0-4.0
160
300
-0.11
BN0707
7.5
5.0-6.0
7
4.0-5.0
160
300
-0.11
BN0908
9
6.0-6.8
8
4.5-5.5
160
300
-0.11
BN0908
9
6.0-6.8
8
5.0-6.0
160
350
-0.11
BN0913
9
6.0-6.6
13
5.0-6.0
180
350
-0.10
BN0910
9.5
6.2-6.8
10
5.0-6.0
180
350
-0.10
BN1008
10.5
6.8-7.3
8
5.0-6.0
160
350
-0.10
BN1108
11
7.0-7.5
8
5.5-6.5
160
350
-0.10
BN1209
12
7.2-7.7
9
5.5-6.5
160
350
-0.10
BN1210
12
7.4-8.0
9.5
5.5-6.5
160
350
-0.10
BN1206
12
7.6-8.1
6
5.0-6.0
150
320
-0.12
Properties
CGS
SI
Density
6.0 g/cm3
6000 kg/m3