Hot Pressed Magnets

There is a huge gap between the magnetic properties of bonded magnets and sintered Neodymium magnets, therefore, high-abundant rare-earth permanent magnets and hot pressed magnet are regarded as the potential options to fill this gap. In fact, hot pressed magnets are another solution to manufacture anisotropic radially oriented ring magnets except conventional sintered type. Randomly oriented crystals go through preferential grain growth and rotation during continuously hot-working process, then results in the full-density nanocrystalline structure with superior magnetic performance in the radial direction.

Hot Pressed Magnets

Advantages of Hot Pressed Magnets

  • Energy Products of the radial direction can achieve 240 ~ 360 kJ/m3.
  • Ideal thermal stability, Max. Operating Temperature can reach 200 degrees Celsius.
  • Ring magnet with small-sized or high L/D ratio is possible.
  • Nanocrystalline structure and high density will provide excellent anti-corrosion performance for the hot-pressed magnets.
  • Hot-pressed magnet also has flexible magnetization pattern which will improve motor performance.

Manufacturing Process of Hot Pressed Magnets

Hot Pressed Magnets-2

Magnetic Properties Chart

Grade Remanence

Br

Coercivity

Hcb

Intrinsic Coercivity

Hcj

Max. Energy Product

(BH)max

T kGs kA/m kOe kA/m kOe kJ/m3 MGOe
50M 1.40-1.45 14.0-14.5 ≥1043 ≥13.1 ≥1114 ≥14 374-406 47-51
45M 1.33-1.37 13.3-13.7 954-1058 12.0-13.1 ≥1273 ≥16 318-366 40-46
42M 1.29-1.32 12.9-13.2 939-1034 11.8-13.0 ≥1273 ≥16 302-342 38-43
48H 1.35-1.40 13.5-14.0 1042-1114 13.1-13.6 ≥1432 ≥18 342-366 43-36
45H 1.32-1.35 13.2-13.5 954-1042 12.5-13.1 ≥1432 ≥18 318-342 40-43
42H 1.29-1.32 12.9-13.2 931-1010 12.2-13.1 ≥1432 ≥18 286-326 36-41
40H 1.26-1.29 12.6-12.9 931-1010 11.7-12.7 ≥1432 ≥18 286-318 36-40
45SH 1.32-1.35 13.2-13.5 954-1042 12.5-13.1 ≥1592 ≥20 318-342 41-44
42SH 1.29-1.32 12.9-13.2 962-1042 12.2-13.1 ≥1592 ≥20 302-326 38-41
40SH 1.26-1.29 12.6-12.9 939-1010 11.8-12.7 ≥1592 ≥20 286-318 36-40
38SH 1.22-1.26 12.2-12.6 923-986 11.6-12.4 ≥1592 ≥20 278-310 35-39
35SH 1.18-1.23 11.8-12.3 891-962 11.2-12.1 ≥1592 ≥20 246-286 31-36
38UH 1.22-1.26 12.2-12.6 907-986 11.4-12.4 ≥1989 ≥25 278-318 35-40
35UH 1.18-1.23 11.8-12.3 891-962 11.2-12.1 ≥1989 ≥25 246-286 31-36
  • The above-mentioned data of magnetic properties and physical properties are given at room temperature.
  • The max working temperature of magnet is changeable due to length-diameter ratio, coating thickness and other environment factors.