COMPRESSION BONDED MAGNETS

Compression bonded magnets are available using many isotropic neodymium iron boron material grades as well as crushed & powdered samarium cobalt materials. Combinations of different material grades may also be used to create specific magnetic characteristics. Compression bonded magnets offers higher magnetic strength than injection molded magnets due to their higher magnetic particle density, but are limited to simpler geometries. The epoxy binder used is resistant to normal industrial solvent and automotive fluids. To reduce corrosion of the rare earth magnetic materials, they are further coated with epoxy after shaping. The normal application temperatures range from below -40°C to above 165°C.

Compression bonding is most appropriate for relatively simple geometries due to limitations of the compaction process. The tooling costs for compression bonding is comparatively low, making it a better choice than injection molding where volumes are small. However, with modest automation, compression bonding can also be adopted for high volume manufacturing, with volumes upto millions of pieces per year.

     
     
Bonded NdFeB Magnets
(Compression Bonded)
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Typical Magnetic Properties
 
Grade

Max. Energy Product

Remanence

Coercive Force

Rev. Temp.
Coeff.

Working Temp.

Density

(BH)max
Br
Hc
Hci
Bd
Hd
Tw
D
MGOe kJ/m3 kG mT kOe kA/m kOe kA/m %/°C %/°C °C g/cm3
N-B4 4.0-5.0 32.5-40.6 4.5 450 4.3 344 8.0 640 -0.10 -0.40 150 4.5-5.0
N-B6 5.0-7.0 40.6-56.9 5.5 550 4.3 344 8.0 640 -0.10 -0.40 150 5.3-5.6
N-B8 7.5-8.5 60.9-69.1 6.3 630 5.3 424 10.0 800 -0.10 -0.40 140 5.8-6.0
N-B8H 8.0-9.0 65.0-73.1 6.4 640 5.6 448 15.0 1200 -0.13 -0.40 120 5.8-6.0
N-B10 9.0-10.0 73.1-81.3 6.9 690 5.3 424 9.5 760 -0.10 -0.40 120 6.0-6.2
N-B10H 9.0-10.0 73.1-81.3 6.8 680 5.6 448 10.0 800 -0.10 -0.40 130 6.0-6.2
N-B12 10.0-12.0 81.3-97.5 7.8 780 5.8 464 10.5 840 -0.10 -0.40 130 6.2-6.6
N-B12H 10.0-12.0 81.3-97.5 7.8 780 5.8 464 11.0 880 -0.07 -0.40 140 6.2-6.6
Binder: Epoxy - Special properties can be achieved with custom method.



     
Bonded SmCo Magnets
(Compression Bonded)
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Typical Magnetic Properties
 
Grade

Max. Energy Product

Remanence

Coercive Force

Curie Temp.

Working Temp.

Rev. Temp. Coeff.

(BH)max
Br
Hc
Hci
Tc
Tw
Bd
MGOe kJ/m3 kG mT kOe kA/m kOe kA/m °C °C %/°C
SC-B4
4.0 32.0 4.0 400 3.5 280 10.0 800 720 120 -0.08
SC-B6
6.0 48.0 5.0 500 4.0 320 10.0 800 720 120 -0.08
SC-B8
8.0 64.0 6.0 600 4.5 360 10.0 800 720 120 -0.08
SC-B10
10.0 80.0

7.0

700 4.0 320 5.0 400 720 120 -0.08
SC-B10H
10.0 80.0 7.0 700 5.0 400 10.0 800 720 120 -0.08
Binder: Epoxy - Special properties can be achieved with custom method.



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