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.
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 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 .
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:
Physical Vapor Deposition – PVD method
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.
Rare Earth Neodymium Grain Boundary Diffusion Magnets, Heavy Rare Earth Elements (HREE) GBD Process NdFeB Magnets, Grain Boundary Diffusion (GBD) Process NdFeB permanent magnets, high-end neodymium magnets China factory Rare Earth Neodymium Grain Boundary Diffusion Magnets is an important new advance in Neodymium magnet production technology. Heavy Rare Earth Elements (HREE) are delivered directly to […]
19mm x 2mm Neodymium Disk Magnet N35 Ni, Powerful Strong Rare Earth NdFeB Magnetic Disk, Ni-Cu-Ni Plated Disc Round Neodymium Permanent Magnet China Supplier Neodymium Disk Magnet Technical Specifications: Item: NDN35-1902 Grade: N35 Material: Neodymium (NdFeB) Plating: Nickel (Ni-Cu-Ni) / Double Ni Shape: Disc, Disk, Round Dimension: Total Diameter (D): Ø 19 mm Total Height […]
24.5mm x 3.5mm Disc Neodymium Magnet N35 Ni, Powerful Rare Earth NdFeB Disk, Nickel-Copper-Nickel Plated Disc Neodymium Permanent Magnet China Factory Disc Neodymium Magnet N35 Technical Specifications: Item: NDN35-24.53.5 Grade: N35 Material: Neodymium (NdFeB) Plating: Nickel (Ni-Cu-Ni) / Double Ni Shape: Disc, Disk, Round Dimension: Total Diameter (D): Ø24.5 mm Total Height (H): 3.5 mm […]
22.23mm x 19.05mm Sintered NdFeB Disk Magnet N35 Ni, Strong Rare Earth NdFeB Disc Magnet, Nickel-Copper-Nickel Plated Disk Neodymium Permanent Magnet China Factory 22.23mm x 19.05mm Sintered NdFeB Disk Magnet N35 Ni Technical Specifications: Item: NDN35-22.2319.05 Grade: N35 Material: Neodymium (NdFeB) Plating: Nickel (Ni-Cu-Ni) / Double Ni Shape: Disc, Disk, Round Dimension: Total Diameter (D): […]