Material： NdFeB
Grade：N45
Shape：Ring / Donut Magnet
Dimensions: Customized
Tolerance：+/-0.1mm
Coating： Nickel-plated (Ni-Cu-Ni)
Magnetization： Axial (Poles on Flat Ends)
Max. working temperature： 80°C / 176°F
 Black Epoxy Coating Ring NdfebBonded NdFeB magnet is made through "compression molding" or "injection molding" of the mixture of quick-quenched NdFeB magnetic powder and bonding agent. Due to its high accuracy in size, the bonded magnet may be formed into magnetic components of relatively complicated shapes. Also, it features single-time molding and multi-pole orientation. The injection-molded magnet has a high mechanical strength and may be molded together with other matching parts. |
Physical and Mechanical Characteristics:
Density | 7.4-7.5 g/cm3 |
Compression Strength | 950 MPa (137,800 psi) |
Tensile Strength | 80 MPa (11,600 psi) |
Vickers Hardness (Hv) | 560-600 |
Young's Modulus | 160 GPa (23,200 ksi) |
Recoil Permeability | 1.05 μrec |
Electrical Resistance (R) | 160 μ-ohm-cm |
Heat Capacity | 350-500 J/(kg.°C) |
Thermal Expansion Coefficient (0 to 100°C) | 5.2 x 10-6 /°C |
Thermal Expansion Coefficient (0 to 100°C) | -0.8 x 10-6 /°C |
Plating Characteristics:
Plating Type | Overall Thickness | Salt Spray Test | Pressure Cooker Test |
NiCuNi (Nickel Copper Nickel) | 15-21 μm | 24 hours | 48 hours |
NiCu + Black Nickel | 15-21 μm | 24 hours | 48 hours |
NiCuNi + Epoxy | 20-28 μm | 48 hours | 72 hours |
NiCuNi + Gold | 16-23 μm | 36 hours | 72 hours |
NiCuNi + Silver | 16-23 μm | 24 hours | 48 hours |
Zinc | 7-15 μm | 12 hours | 24 hours |
Each individual layer of Nickel and Copper are 5-7 μm thick. The Gold and Silver plating layers are 1-2 μm thick.
Test results shown to allow comparison between plating options. Performance in your application under your specific test conditions may vary. Salt Spray testing conducted with a 5% NaCl solution, at 35°C. Pressure Cooker Test (PCT) conducted at 2 atm, 120°C at 100% RH.
Product Pictures:
Applications：
Important Note:
Neodymium magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. It is highly recommended that when constructing rare earth magnetic assemblies, they are magnetized after assembly.
