Grain Boundary Diffusion (GBD) in permanent magnets is the process of distributing heavy rare-earth elements into the intergranular material that is wrapped around the grains of a sintered magnet. The end-goal is to increase the coercivity (resistance to demagnetization) of the magnet without compromising its induction (magnetic strength).

Grain Boundary Diffusion (GBD) increases the Coercivity of Neodymium magnets while conserving the Remanence (Br) due to the unique grain structure of Neodymium magnets. HREE Dysprosium (Dy) and Terbium (Tb) have been used for decades in the manufacture of Neodymium magnets.

2025年2月15日 · Research has demonstrated that the GBD technique is a promising approach for enhancing the coercivity of RE-Fe-B sintered magnets. This method achieves a significant increase in Hcj with minimal consumption of heavy rare earth (HRE) elements while maintaining remanence (Br) and (BH) max with minimal degradation [[23], [24], [25]].

2025年2月15日 · In the conventional grain boundary diffusion (GBD) process, heavy rare earth elements such as Dy and Tb—either as metals, alloys, or compounds—are applied to the surface of sintered Nd-Fe-B magnets and subsequently diffused into the grain boundaries.

Discover Tongchuang's advanced Grain Boundary Diffusion (GBD) technology, designed to enhance the magnetic properties of neodymium magnets. Our GBD process improves coercivity, heat resistance, and overall magnet performance while maintaining cost-efficiency.

GBD magnets are an environmentally friendly solution. One of the main topics in global permanent magnet research is the reduction of HRE, without degrading the performance of NdFeB permanent magnets, but rather improving them. A promising approach to achieve this goal is the grain boundary diffusion process, also known as the GBD process.

GBD magnets are an environmentally friendly solution. One of the main topics in world-wide permanent magnet research is the reduction of HRE, without thereby impairing the performance of NdFeB permanent magnets, but rather to improve it further.

2017年8月31日 · Grain boundary diffusion process is starting by introducing HREE layer to the magnet’s surface, then processing vacuum heat treatment above the melting point of Nd-rich phase. Thereby, HREE element diffuse into the magnet along the grain boundaries and form (Nd, Dy, Tb) 2 Fe 14 B core-shell structure around main phase grain.

Grain Boundary Diffusion (GBD) in permanent magnets is the process of distributing heavy rare-earth elements into the intergranular material which is wrapped around the grains of a sintered magnet. This process increases the coercivity (Resistance to demagnetization) of the magnet without compromising the induction strength (Br) of the magnet.

2023年5月15日 · Grain boundary diffusion (GBD) Nd-Fe-B sintered magnets were prepared using a newly developed solid-liquid phase separation diffusion (SepD) technique, as well as a currently popular solid-liquid phase simultaneous diffusion (SimD) technique.