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
## physical properties of neodymium magnets

## measurement systems of neodymium iron boron magnets

## mechanical characteristic of neodymium NdFeB magnets

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.

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 |
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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/in^{2}
| ||||||

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 | µ_{0}
| 1 | 4 pi x 10^{-7}
| 3.192 | ||||||

Total | 6 neodymium magnets, NdFeB magnets, neodymium iron boron, NIB |

Physical Characteristic | Unit | |||||||||
---|---|---|---|---|---|---|---|---|---|---|

Density | 7.4-7.5 g/cm^{3}
| |||||||||

Compression Strength | 110 kg/mm^{2}
| |||||||||

Bending Strength | 25 kg/mm^{2}
| |||||||||

Vickers Hardness (Hv) | 560-600 | |||||||||

Tensile Strength | 7.5kg/mm^{2}
| |||||||||

Young’s Modulus | 7 x 104 kg/mm^{2}
| |||||||||

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 | 5.2×10^{C6} /°C
| |||||||||

Thermal Expansion Coefficient (0 to 100°C) perpendicular to magnetization direction | C0.810^{C6} /°C
| |||||||||

Total | 11 neodymium magnets, NdFeB magnets, NIB |

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