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NdFeB magnet is the most widely used magnetic material, is also the most inquiries in our website, it is divided into ordinary temperature-resistant and high-temperature-resistant grade, today we mainly introduce high temp neodymium magnets.
High temperature neodymium magnets refer to NdFeB magnets that can work stably in high temperature environments and have excellent magnetic properties. Compared with ordinary NdFeB magnets, they have better demagnetization resistance and are suitable for applications with high temperatures or large temperature fluctuations.
Common Shapes of High Temperature neodymium Magnets - Arc Shape
Characteristics of high temperature neodymium magnets;
Higher temperature resistance: the maximum working temperature of ordinary NdFeB is generally 80℃-150℃, while high-temperature NdFeB can withstand 180℃-220℃ or even higher.
Higher coercivity: special formula (e.g. adding rare earth elements such as cobalt, dysprosium, terbium, etc.) is used to enhance magnetic stability, which is not easy to demagnetize under high temperature environment.
High energy density: still maintains a high magnetic energy product (BHmax), suitable for applications requiring high magnetic field strength.
Technical principles for realizing high temperature performance of NdFeB:
1. Addition of heavy rare earth elements (Dy, Tb)
2. By coating the magnet surface with compounds containing Dy, Tb and diffusing them to the grain boundaries at a certain temperature, the effect of increasing the coercivity at low cost without significantly reducing the remanent magnetization (Br) is achieved.
3. Refine the Nd₂Fe₁₄B main-phase grains and improve the high-temperature stability of the magnets by using processes such as rapid solidification, aerosolized powder, and hot isostatic pressing (HIP).
4. Construct a dual-phase structure of Nd-rich and Fe-rich phases in the magnet to enhance the antimagnetization capability at high temperatures through the synergistic effect between the phases.
How to choose high temperature neodymium magnets?
Determine determine the required temperature resistance level, such as 150°C, 180°C or 200°C or more.
Requirements for magnetic performance, such as the recent release of BYD's super 30,000 rpm drive motor selected N50EH grade.
High temperature environment is easy to oxidize, it is recommended to choose nickel plating + epoxy or Parylene coating.
The above is the introduction of high temperature neodymium magnets, if your company needs to buy high temperature neodymium magnets, or super 300 ℃, 400 ℃ permanent magnets, you can send us an inquiry.
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