Hot Pressed Magnets

Hot pressed Neodymium magnets are manufactured starting with the preparation of rapidly quenched powder. Next, the powder is cold pressed at room temperature, then hot pressed at around 800 degrees Celsius to form a fully dense body. This hot pressed body results in an isotropic magnet. To create anisotropic magnets, the hot pressed body undergoes hot deformation at approximately 800 degrees Celsius. Following hot deformation, the body is machined, subjected to surface treatment, and magnetized sequentially.

• (BH)max values range from 240 to 400 kJ/m³, which is much higher than that of sintered radially oriented ring magnets.
• Their maximum operating temperature can reach 200 degrees Celsius.
• Hot deformed Neodymium magnets are better suited for radially oriented ring magnets that are small in size, feature high L/D ratios, or have thin walls, compared to traditional sintered radially oriented ring magnets.
• Hot extruded Neodymium magnets exhibit excellent corrosion resistance due to their nanocrystalline structure, lower Nd-rich phase content, and higher density.
• They are free from cracking and deformation caused by internal stress, thereby demonstrating significantly improved mechanical strength.
• The rare earth element content in hot pressed Neodymium magnets is 2% lower than in sintered Neodymium magnets under the same magnetic performance requirements, which is highly beneficial for cost control and conserving rare earth resources.
• Hot pressed Neodymium magnet requires fewer heavy rare earth elements (HREEs) to improve coercivity and, consequently, thermal stability.
• The production cycle is short, and the entire process involves near-net-shape manufacturing, achieving a higher raw material utilization rate.
• Hot pressed Neodymium magnets have been proven to provide reliable performance assurance for permanent magnet motors.