neodymium(NdFeB) magnets, samarium cobalt(SmCo5, Sm2Co17)magnets, Alnico magnets, permanent rare earth magnets.
NCMag™ supplier of neodymium(rings, blocks, discs) magnets; manufacturer of NdFeB (cylinders, segments, rods) magnets in china.

what's neodymium(rings, blocks, discs) magnet? where's NdFeB(cylinders, segments, rods) magnets manufacturer? how to buy NIB(disk, arc, bar) magnet?

Neodymium magnets (Nd-Fe-B) are composed of neodymium, iron, boron and a few transition metals. These magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs

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. Magnets can chip if allowed to “jump at” an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they be magnetized after assembly.

For as pressed material, tolerance on the thickness is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater. According to IMA standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of pole surface.

physical properties of neodymium magnets

NdFeB magnets, neodymium iron boron magnets
Temp.Coeff.of Br 0.11% Temp.Coeff.of Hc -0.60%
Density 7.3-7.5g/cm 3 Electrical Resistivity 114 .cm
Vickers Hardness 600Hv Flexural Resistivity 25kg/mm
Tensile Strength 8.0Kg/mm2 Coeff. Of Thermal Expansion 4X10 -6
Specific Heat 0.12Kcal/Kg Thermal Conductivity 7.7kcal/
Young's Modulus 1.6X10N/m2 Rigidity 0.64N/m2
Poisson's Ratio 0.24 Compressibility 9.8x10-12m2/N
Curie Temperature 310-340 - -
Total 8 neodymium magnets, NdFeB magnets, NIB, neodymium iron boron

measurement systems of neodymium iron boron magnets

NdFeB magnets, neodymium iron boron magnets
Unit Symbol cgs System SI System English System
Length L centimeter (cm) meter (m) inch (in)
Flux ø maxwell weber (Wb) maxwell
Flux Density B gauss (G) Tesla (T) lines/in2
magnetizing force H Oersted (Oe) ampere turns/m (At/m) ampere turns/in (At/in)
Magnetomotive Force F gilbert (Gb) ampere turn (At) ampere turn (At)
permeability in air µ0 1 4 pi x 10-7 3.192
Total 6 neodymium magnets, NdFeB magnets, neodymium iron boron, NIB

mechanical characteristic of neodymium NdFeB magnets

NdFeB magnets, neodymium iron boron magnets
Physical Characteristic Unit
Density 7.4-7.5 g/cm3
Compression Strength 110 kg/mm2
Bending Strength 25 kg/mm2
Vickers Hardness (Hv) 560-600
Tensile Strength 7.5kg/mm2
Young’s Modulus 7 x 104 kg/mm2
Recoil Permeability 1.05 μrec
Electrical Resistance (R) 160 µ-ohm-cm
Heat Capacity 350-500 J/(kg.ºC)
hermal Expansion Coefficient (0 to 100°C)
parallel to magnetization direction
5.2×10C6 /°C
Thermal Expansion Coefficient (0 to 100°C)
perpendicular to magnetization direction
C0.810C6 /°C
Total 11 neodymium magnets, NdFeB magnets, NIB
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