- DX2Z0-N33AH Neodymium Disc Magnets, 1 1/8" dia. x 3" thick, Pull force(lbs): 124.92, Max Temp 220°C
- B224-N48M Neodymium Block Magnets, 1/8" x 1/8" x 1/4" thick, Pull force(lbs): 3.65, Max Temp 100°C
- DXC3-N42SH Neodymium Disc Magnets, 1 3/4" dia. x 3/16" thick, Pull force(lbs): 29.39, Max Temp 150°C
- BZ0Y0X0-N45M Neodymium Block Magnets, 3" x 2" x 1" thick, Pull force(lbs): 266.65, Max Temp 100°C
- BX066-N42M Neodymium Block Magnets, 1" x 3/8" x 3/8" thick, Pull force(lbs): 23.21, Max Temp 100°C
- D56-N40 Neodymium Disc Magnets, 5/16" dia. x 3/8" thick, Pull force(lbs): 8.93, Max Temp 80°C
- BC11-N38M Neodymium Block Magnets, 3/4" x 1/16" x 1/16" thick, Pull force(lbs): 1.25, Max Temp 100°C
- DCC-N33UH Neodymium Disc Magnets, 3/4" dia. x 3/4" thick, Pull force(lbs): 35.41, Max Temp 180°C
- B885-N38M Neodymium Block Magnets, 1/2" x 1/2" x 5/16" thick, Pull force(lbs): 14.39, Max Temp 100°C
- DEX4-N33SH Neodymium Disc Magnets, 7/8" dia. x 1 1/4" thick, Pull force(lbs): 56.72, Max Temp 150°C
- Neodymium Ring & Tube Magnets Table
- Heavy rare earth magnets
- Neodymium Disc Magnets Table
- Glossary of Magnet Terminology
- Neodymium Magnets Production
- Neodymium Sphere & Ball Magnets Table
- Strength of Neodymium Magnets
- What are Rare Earth Magnets?
- What are neodymium magnets?
- Neodymium Magnets Coating
GBD Magnets are an environmentally friendly solution
GRAIN BOUNDARY DIFFUSION 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(GRAIN BOUNDARY DIFFUSION) process.
In this newly introduced production process, the intrinsic coercive field strength H cJ of NdFeB magnets can be significantly increased:
Demagnetization curves of a NdFeB magnet before the GBD(GRAIN BOUNDARY DIFFUSION) 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(GRAIN BOUNDARY DIFFUSION) process has a negligible influence on the residual polarization B r .
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 . Here you can find graph 1.
With efficient use of HRE, the reduction of remanence can be practically neglected. Here you can find graph 2.
GBD(GRAIN BOUNDARY DIFFUSION) – PVD
There are many options for carrying out the GBD(GRAIN BOUNDARY DIFFUSION) process.
Yunsheng uses the following two methods:
Physical Vapor Deposition – PVD method
THE SPRAY MANUFACTURING PROCESS FOR GBD SINTERED NFFEB MAGNETS
In the GBD(GRAIN BOUNDARY DIFFUSION) 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.
Here you can find the GBD(GRAIN BOUNDARY DIFFUSION) alloys and here the demagnetization curves.
Next: Heavy rare earth magnets
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