Compression molded magnets are consisting of isotropic NdFeB powder and thermosetting epoxy resin binder, then compound compression molded into the required geometry and thus cured at a specific temperature. Compression molded magnets need to be applied epoxy resin through electrophoresis or spraying technology to obtain superior corrosion resistance. It has higher magnetic performance due to the higher loading of magnetic powder. Unlike injection molded magnets, compression molded magnets are suitable those applications with relatively lower mechanical strength and uncomplicated shapes, especially thin-wall ring shape. As the most representative products, ring magnets can be magnetized to multipole, thus used by various kinds of micro motor.
Manufacturing Process of Compression Molded Magnets
Magnetic Properties of Compression Molded Magnets
| Grade |
Remanence Br |
Coercivity Hcb |
Intrinsic Coercivity Hcj |
Max. Energy Product (BH)max |
Max. Operating Temperature Tw |
Temp. Coefficient Of Br |
Density ρ |
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| mT | kGs | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | ℃ | %/℃ | g/cm3 | |
| BN-2 | 300-400 | 3.0-4.0 | 240-320 | 3.0-4.0 | 480-640 | 6.0-8.0 | 24-32 | 3.0-4.0 | 160 | -0.11 | 4.5-5.0 |
| BN-4 | 400-500 | 4.0-5.0 | 240-320 | 3.0-4.0 | 560-720 | 7.0-9.0 | 32-48 | 4.0-6.0 | 160 | -0.11 | 5.0-5.5 |
| BN-6 | 500-600 | 5.0-6.0 | 320-400 | 4.0-5.0 | 560-720 | 7.0-9.0 | 48-60 | 6.0-7.5 | 160 | -0.11 | 5.5-5.8 |
| BN-8 | 600-680 | 6.0-6.8 | 360-440 | 4.5-5.5 | 640-800 | 8.0-10.0 | 60-72 | 7.5-9.0 | 160 | -0.11 | 5.8-6.0 |
| BN-8L | 600-680 | 6.0-6.8 | 400-480 | 5.0-6.0 | 640-800 | 8.0-10.0 | 64-72 | 8.0-9.0 | 160 | -0.11 | 5.8-6.1 |
| BN-8H | 600-660 | 6.0-6.6 | 400-480 | 5.0-6.0 | 1040-1360 | 13.0-17.0 | 64-72 | 8.0-9.0 | 180 | -0.10 | 5.8-6.1 |
| BN-8SR | 600-680 | 6.0-6.8 | 400-480 | 5.0-6.0 | 800-1120 | 10.0-14.0 | 68-76 | 8.5-9.5 | 180 | -0.10 | 5.8-6.1 |
| BN-10 | 680-730 | 6.8-7.3 | 400-480 | 5.0-6.0 | 640-800 | 8.0-10.0 | 76-84 | 9.5-10.5 | 160 | -0.10 | 5.8-6.1 |
| BN-10H | 700-750 | 7.0-7.5 | 440-520 | 5.5-6.5 | 720-800 | 9.0-10.0 | 80-88 | 10.0-11.0 | 160 | -0.10 | 6.0-6.3 |
| BN-12 | 720-770 | 7.2-7.7 | 440-520 | 5.5-6.5 | 720-800 | 9.0-10.0 | 88-96 | 11.0-12.0 | 160 | -0.10 | 6.0-6.3 |
| BN-12H | 720-770 | 7.2-7.7 | 440-520 | 5.5-6.5 | 760-880 | 9.5-11.0 | 88-96 | 11.0-12.0 | 160 | -0.10 | 6.1-6.4 |
| BN-12L | 760-810 | 7.6-8.1 | 400-480 | 5.0-6.0 | 480-640 | 6.0-8.0 | 88-96 | 11.0-12.0 | 150 | -0.12 | 6.0-6.3 |
| BN-13L | 780-830 | 7.8-8.3 | 400-480 | 5.0-6.0 | 480-640 | 6.0-8.0 | 88-104 | 11.0-13.0 | 150 | -0.12 | 6.1-6.4 |
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