The Latest News On High-Temperature Resistant NdFeB Magnets in China

The Latest News on High-Temperature Resistant NdFeB Magnets in China: Dual-Use Products and Regulatory Updates

With China's continuous innovation in the field of rare earth permanent magnet materials, the technology of high temperature resistance NdFeB magnet has made significant breakthroughs. The newly developed NdFeB magnets containing dysprosium (Dy) and terbium (Tb) can still maintain excellent magnetic properties in high temperature environments (180°C-220°C) and are widely used in new energy vehicles, wind power generation, industrial motors and high-end electronic equipment.

 

Key technological progress:

High coercivity formula optimization: By adding heavy rare earth elements such as dysprosium (Dy) and terbium (Tb), the high temperature stability of the magnet is significantly improved.

Grain boundary diffusion technology (GBD): Reduce the amount of heavy rare earths, reduce costs, while maintaining high performance.

 

Corrosion-resistant coating upgrade: Use multi-layer coating (Ni-Cu-Ni, epoxy resin, etc.) to enhance the durability of the magnet in harsh environments.

 

 

Since 2023, the Chinese government has strengthened export controls on dual-use items involving national security (including high-performance NdFeB magnets). The latest policy requirements:

Export license management:

1. High-performance NdFeB magnets containing dysprosium (Dy) or terbium (Tb) (such as H series, SH series, UH series) need to apply for a "Dual-Use Items and Technology Export License".

2. Applicable to magnets with a magnetic energy product (BHmax) ≥45MGOe or an operating temperature ≥150°C.

End-use review:

Exporters are required to provide an end-user statement to ensure that the product is not used in military or sensitive fields (such as aerospace, radar systems).

Supply chain compliance requirements:

Enterprises need to establish a complete traceability system for rare earth raw materials in accordance with China's Export Control Law and international trade rules.

 

 

Dual-use products are materials and technologies that can be used for both civilian and military applications. In the case of NdFeB magnets, the addition of rare earth elements such as dysprosium (Dy) and terbium (Tb) enhances the product's high temperature performance and overall magnetic strength. These elements are essential for producing high-performance magnets for critical applications, including:

 

Electric Vehicle (EV) Motors: High temperature NdFeB magnets are essential to the performance and life of EV motors, and global demand for EVs is growing rapidly.

Aerospace and Defense: These magnets are used in satellites, missile guidance systems, and military-grade equipment, where maintaining high performance at high temperatures is critical.

Renewable Energy: Wind turbines and other renewable energy systems also rely on high temperature magnets for efficient energy conversion.

 

 

As mentioned earlier, high temperature NdFeB magnets are key components in several key industries. Let's look at how adding dysprosium (Dy) and terbium (Tb) enhances their performance:

Improved thermal stability: Dy and terbium help stabilize the crystal structure of NdFeB magnets, allowing them to maintain their magnetization at higher temperatures. This is particularly important in applications where high temperatures are unavoidable, such as electric vehicle motors and aerospace systems.

Boosted magnetic strength: These rare earth elements increase the magnet's inherent coercivity, which means the magnet retains its magnetic properties in more demanding environments.

Enhanced durability and service life: High temperature resistance not only extends the life of the magnet, but also reduces the risk of performance degradation over time, providing a more reliable product for high-tech industries.