| project | parameter | reference value |
auxiliary magnetic properties | remanence temperature coefficient (α(Br))/(%/K) | -0.08～-0.12 |
| intrinsic coercive force temperature coefficient (β(Hcj))/(%/K) | -0.42～-0.70 |
| curie temperature (Tc)/(°C) | 310～380 |
| recovery permeability (μrec)/(-) | 1.05 |
mechanical physical properties | density/(g/cm3) | 7.45～7.70 |
| dimensional hardness/(Hv) | 650 |
| resistivity/(μΩ•m) | 1.4 |
| compressive strength/(MPa) | 1050 |
| tensile strength/(MPa) | 80 |
| bending strength/(MPa) | 290 |
| thermal conductivity/(W/(m•K)) | 6～8 |
| young modulus/(GPa) | 160 |
| Coefficient of thermal expansion (perpendicular to orientation)/(10-6/K) | -1.5 |
| coefficient of thermal expansion (parallel to orientation direction)/(10-6/K) | 6.5 |
specifications and parameters are subject to change without notice。
| size range | plane dimension | parallelism | verticality |
| 0.5≤L≤10 | ±0.03 | ±0.03 | adjacent surface<0.3度 |
| 10≤L≤50 | ±0.05 | ±0.05 |
| L>50 | ±0.1 | ±0.1 |
| size range | roundness | tolerance | parallelism |
| 1≤D≤5 | ±0.02 | ±0.02 | ±0.02 |
| 5≤D≤25 | ±0.03 | ±0.05 | ±0.03 |
| 25≤D≤50 | ±0.05 | ±0.05 | ±0.05 |
| D>50 | ±0.05 | ±0.1 | ±0.1 |
| size range | roundness | tolerance | parallelism |
| 1≤d≤3 | ±0.02 | ±0.02 | ±0.02 |
| 3≤d≤5 | ±0.04 | ±0.03 | ±0.02 |
| 5≤d≤15 | ±0.05 | ±0.05 | ±0.03 |
| d>15 | ±0.1 | ±0.05 | ±0.1 |
| project | size range | tolerance |
| wall thickness | T≤10 | ±0.04 |
| 10<T≤25 | ±0.05 |
| 长度 | L≤10 | ±0.03 |
| 10< L≤25 | ±0.03 |
| 25< L≤63 | ±0.04 |
| L>63 | ±0.06 |
| 弧面方向宽度 | W>63 | ±0.05 |
| W>63 | ±0.06 |
The body of NdFeB is easy to be corroded. In order to overcome this defect, the surface of NdFeB is often coated with blue white zinc, color zinc, nickel, double-layer nickel, tin, copper nickel and epoxy resin; (temporary protection) phosphating, etc。
>> Inorganic coating: blue white zinc, color zinc, single layer nickel, double layer nickel, gold plating, nickel copper nickel。
>> organic coating: epoxy
>> temporary protection: phosphating, baking blue
钕铁硼永磁材料已广泛应用于汽车工业、风力发电、节能家电、节能电梯、医疗设备、消费类电子以及其他领域
