Composite magnet introduction

Bonded magnet and Injection Molded are the main method to modified composite magnets. Bonded magnet is manufactured through the process of compression and bonding which offer higher magnetic characteristics but are limited to simpler geometries than Injection Molded materials. Using certain permanent magnet properties of bonded magnet, powder and binder mixed, according to a certain application or designing in different project.

Injection Molding magnet:

  • Binder Types / Nylon / PPS / Polyamide(polymide).
  • Temperature Range -40c – 180c
  • Very Tight tolerances off tool ( 0.002 -0.003 Typical )
  • Better mechanical strength

Compression Bonded magnet:

  • Higher Magnetic Strength due to higher magnetic particle density.
  • Epoxy Binder / Resistant to normal industrial solvents and automotive fluids
  • Epoxy Coat after manufacturing to prevent oxidation
  • Temperature Range -40c – 165c
  • “Tight” tolerances off tool
  • Good mechanical strength

Bonded magnet specification:

Magnetic Characteristics 1009 0813
Residual
Induction (Br)
(G) 6800 6350
(mT) 680 635
Coercive Force (Hc) (Oe) 5800 5600
(kA/m) 460 440
Intrinsic Coercive Force Hcl (kOe)Minimum 9100 13900
(kA/m) 720 1100
Maximum Energy Product BHmax (MGOe) 10 8.8
(kJ/m) 79 70
Magnetic Characteristics 1009 0813
Density (lbs/in) 0.213 0.213
(g/cm) 5.9 5.9
Curie Temperature °F Nominal 680 878
°C Nominal 360 470
Maximum Operating Temperature °F 302 302
°C 150 150

Bonded magnet advantage:

  • Materials are isotropic and can be magnetized in any direction
  • Wide range of existing tool sizes are available in rings, discs and rectangles
  • Existed Multi-pole magnetizing fixtures for quick prototyping
  • Easily machined
  • Existing Multi-pole rings simplify assembly verse arc segment