GBD SINTERED NFFEB MAGNETS – GRAIN BOUNDARY DIFFUSION Technology

GBD sintered ndfeb 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 SINTERED NFFEB MAGNETS – GRAIN BOUNDARY DIFFUSION Technology

GBD SINTERED NFFEB MAGNETS – GRAIN BOUNDARY DIFFUSION Technology

In this newly introduced production process, the intrinsic coercive field strength H cJ of NdFeB magnets can be significantly increased:

GBD Diagram

Demagnetization curves of a NdFeB magnet before the GBD process (red curve) and after the GBD process (black curve) at 120 ° C and 150 ° C. Here it is important to note that the GBD process has a negligible influence on the residual polarization B r .

gdb magnet diagramm

gdb magnet diagramm

The increase of the coercive force H cJ depends on the thickness of the magnet. The thinner the magnet, the better the coercive force H cJ .

With efficient use of HRE, the reduction of remanence can be practically neglected.

GBD – PVD
There are many options for carrying out the GBD process.

MPCO uses the following two methods:

Spray method
Physical Vapor Deposition – PVD method

Magnetic Properties of GBD Magnet

Magnetic Properties of GBD Magnet

GBD SINTERED NFFEB MAGNETS Magnetic Properties

GBD SINTERED NFFEB MAGNETS Magnetic Properties

THE SPRAY MANUFACTURING PROCESS FOR GBD SINTERED NFFEB MAGNETS

In the GBD process, sintered permanent magnets are coated with a thin layer of heavy rare earth metal (HRE) and then undergo a special heat treatment. During the heat treatment, material with an HRE content diffuses along the grain boundaries into the interior of the magnet. This means that the NdFeB grains are surrounded by an HRE-rich shell.

you can find the GBD alloys and the demagnetization curves from MPCO MAGNETICS.

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