Sintered Nd-Fe-B magnet, depending on models, can stand 80-200ºC temperature. It is characterized by high magnetic remanence, high coercive force and high magnetic energy product. It has been the strongest permanent magnet that is researched and developed successfully since 1980s.Sintered Nd-Fe-B magnet, depending on models, can stand 80-200ºC temperature. It is characterized by high magnetic remanence, high coercive force and high magnetic energy product. It has been the strongest permanent magnet that is researched and developed successfully since 1980s.
Sintered Nd-Fe-B Sintered Nd-Fe-B magnet can be used for a wide range, including DVD pick-up/CD-ROM reader/laser head, nuclear magnetic resonance, coil motor, speaker, motor and various magnetic sensors and electronic magnetic force control units.
Sintered Nd-Fe-B magnet obtains its name because it needs to be sintered in high-temperature vacuum furnace. Its shape and size are accomplished with various machines. As the mechanic processing performance of this magnet is bad, it is very simple in shape, including disk, square and C-shape or other irregular shapes.
It is easy to be rusted. The method to prevent rust is to have protective surface treatment, including galvanization, nickel plating and electrophoresis; and also, phosphatizing treatment can be used to delay oxide and rust.
The corrosion endurance of every plating varies. See the attached schedule for details. In application, it is necessary to consider completely the actual application environment and period and choose the fittest treatment method accordingly.
Sintered Nd-Fe-B magnet is rigid, frangible and easy to be corroded. Mutual attraction between magnets due to magnetic force or adherence to different magnets suddenly shall be avoided, because this may destroy the completeness of the magnet and thus cause damages or breaches.
①. Patent protection: The factory with the patent authorized by NEOMAX.
②. Quality assurance: Advanced production equipments; precise test instruments; and perfect quality management system.
③. Production capacity: Keeping culturing high-quality technicians, with large production scale and able to produce products at large scale and stably.
| 1. Cube | |||
| Dimension (mm) | Tolerance (mm) | Parallelism (mm) | Perpendicularity |
| L≤10 | ±0.03 | 0.04 | 0.5 degree for adjacent sides |
| 10＜L≤25 | ±0.03 | 0.06 | |
| 25＜L≤63 | ±0.04 | 0.1 | |
| L＞63 | ±0.06 | 0.12 | |
| 2. Disk | |||
| OD Dimension (mm) | Tolerance (mm) | Cylindricitym (mm) | Circular Run-out (mm) |
| D≤10 | ±0.02 | 0.03 | 0.08 |
| 10＜D≤25 | ±0.02 | 0.03 | 0.08 |
| D＞25 | ±0.03 | 0.04 | 0.1 |
| 3. Segment | |||
| Item | Dimension (mm) | Tolerance (mm) | |
| Thickness | T≤10 | ±0.04 | |
| 10＜T≤25 | ±0.05 | ||
| Length | L≤10 | ±0.03 | |
| 10＜T≤25 | ±0.03 | ||
| 25＜T≤63 | ±0.04 | ||
| L＞63 | ±0.06 | ||
| Chordal Length | W≤63 | ±0.05 | |
| W＞63 | ±0.06 | ||
| 4. Ring | |||
| ID Dimension (mm) | Tolerance (mm) | Coaxiality (mm) | |
| d≤3 | ±0.04 | 0.06 | |
| 3＜d≤6 | ±0.05 | 0.06 | |
| d＞6 | ±0.05 | 0.1 | |
| Magnet grade | Remanence Br | Coercivity HcJ | Coercivity HcJ | Max Energy Product(BH)max | Temperature Coefficient | Relative Recoil Permeability | Max Continious Temperature | Density | |||||||||
| KGs | T | KOe | KA/m | KOe | KA/m | MGOe | KJ/M3 | a(Br) | a(HcJ) | ||||||||
| Max. | Min. | Max. | Min. | Min. | Min. | Min. | Min. | Max. | Min. | Max. | Min. | 1%℃-1 | 1%℃-1 | μrec | (L/D=0.7)/℃ | g/cm3 | |
| ZHN53N | 15 | 14.4 | 1.5 | 1.44 | 11 | 876 | 10.5 | 836 | 54 | 50 | 430 | 398 | -0.11 | -0.75 | 1.05 | 80 | 7.5 |
| ZHN50N | 14.6 | 14 | 1.46 | 1.4 | 11 | 876 | 10.5 | 836 | 51 | 47 | 106 | 374 | -0.11 | -0.75 | |||
| ZHN48N | 14.3 | 13.7 | 1.43 | 1.37 | 11 | 876 | 10.5 | 836 | 49 | 45 | 390 | 358 | -0.11 | -0.75 | |||
| ZHN45N | 13.8 | 13.2 | 1.38 | 1.32 | 12 | 954 | 13.1 | 836 | 46 | 42 | 366 | 334 | -0.11 | -0.75 | |||
| ZHN50M | 14.6 | 14 | 1.46 | 1.4 | 14 | 1114 | 10.5 | 1043 | 51 | 47 | 406 | 374 | -0.1 | -0.65 | 100 | ||
| ZHN48M | 14.3 | 13.7 | 1.43 | 1.37 | 14 | 1114 | 12.8 | 1019 | 49 | 45 | 390 | 358 | -0.1 | -0.65 | |||
| ZHN45M | 13.8 | 13.2 | 1.38 | 1.32 | 14 | 1114 | 12.4 | 987 | 46 | 42 | 366 | 334 | -0.1 | -0.65 | |||
| ZHN42M | 13.5 | 12.9 | 1.35 | 1.29 | 14 | 1114 | 12.1 | 963 | 44 | 40 | 350 | 318 | -0.1 | -0.65 | |||
| ZHN48H | 14.3 | 13.7 | 1.43 | 1.37 | 16 | 1274 | 12.8 | 1019 | 49 | 45 | 390 | 358 | -0.11 | -0.55 | 120 | ||
| ZHN46H | 13.9 | 13.3 | 1.39 | 1.33 | 16 | 1274 | 12.5 | 995 | 47 | 43 | 374 | 342 | -0.11 | -0.55 | |||
| ZHN44H | 13.6 | 13 | 1.36 | 1.3 | 17 | 1353 | 12.2 | 971 | 45 | 41 | 358 | 326 | -0.11 | -0.55 | |||
| ZHN42H | 13.5 | 12.9 | 1.35 | 1.29 | 17 | 1353 | 12.1 | 963 | 44 | 40 | 350 | 318 | -0.11 | -0.55 | |||
| ZHN40H | 13.2 | 12.6 | 1.32 | 1.26 | 17 | 1353 | 11.8 | 939 | 42 | 38 | 334 | 302 | -0.11 | -0.55 | |||
| ZHN38H | 12.9 | 12.2 | 1.29 | 1.22 | 17 | 1353 | 11.4 | 907 | 40 | 36 | 318 | 287 | -0.11 | -0.55 | |||
| ZHN44SH | 13.6 | 13 | 1.36 | 1.3 | 20 | 1592 | 12.2 | 971 | 45 | 41 | 358 | 326 | -0.1 | -0.5 | 150 | 7.6 | |
| ZHN42SH | 13.5 | 12.9 | 1.35 | 1.29 | 20 | 1592 | 12.1 | 963 | 44 | 40 | 350 | 318 | -0.1 | -0.5 | |||
| ZHN40SH | 13.2 | 12.6 | 1.32 | 1.26 | 20 | 1592 | 11.8 | 939 | 42 | 38 | 334 | 302 | -0.1 | -0.5 | |||
| ZHN38SH | 12.9 | 12.2 | 1.29 | 1.22 | 20 | 1592 | 11.4 | 907 | 40 | 36 | 318 | 287 | -0.1 | -0.5 | |||
| ZHN35SH | 12.4 | 11.7 | 1.24 | 1.17 | 20 | 1592 | 10.9 | 868 | 37 | 33 | 295 | 263 | -0.1 | -0.5 | |||
| ZHN40UH | 13.2 | 12.6 | 1.32 | 1.26 | 25 | 1990 | 11.8 | 939 | 42 | 38 | 334 | 302 | -0.095 | -0.5 | 180 | ||
| ZHN38UH | 12.9 | 12.2 | 1.29 | 1.22 | 25 | 1990 | 11.4 | 907 | 40 | 36 | 318 | 287 | -0.095 | -0.5 | |||
| ZHN35UH | 12.4 | 11.4 | 1.24 | 1.17 | 25 | 1990 | 10.9 | 868 | 37 | 33 | 295 | 263 | -0.095 | -0.5 | |||
| ZHN33UH | 12.1 | 11.4 | 1.21 | 1.14 | 25 | 1990 | 10.7 | 852 | 35 | 31 | 279 | 247 | -0.095 | -0.5 | |||
| ZHN30UH | 11.5 | 10.8 | 1.15 | 1.08 | 25 | 1990 | 10.1 | 804 | 32 | 28 | 255 | 223 | -0.095 | -0.5 | |||
| ZHN38EH | 12.9 | 12.2 | 1.29 | 1.22 | 30 | 2388 | 11.5 | 915 | 40 | 36 | 318 | 287 | -0.095 | -0.5 | 200 | ||
| ZHN35EH | 12.4 | 11.7 | 1.24 | 1.17 | 30 | 2388 | 10.9 | 868 | 37 | 33 | 295 | 263 | -0.095 | -0.5 | |||
| ZHN33EH | 12.1 | 11.4 | 1.21 | 1.14 | 30 | 2388 | 10.7 | 852 | 35 | 31 | 279 | 247 | -0.095 | -0.5 | |||
| ZHN30EH | 11.5 | 10.8 | 1.15 | 1.08 | 30 | 2388 | 10.1 | 804 | 32 | 28 | 255 | 226 | -0.095 | -0.5 | |||
| ZHN33AH | 12.1 | 11.4 | 1.21 | 1.14 | 35 | 2786 | 10.7 | 852 | 35 | 31 | 279 | 247 | -0.09 | -0.45 | 230 | 7.7 | |
| ZHN30AH | 11.5 | 10.8 | 1.15 | 1.08 | 35 | 2786 | 10.1 | 804 | 32 | 28 | 255 | 223 | -0.09 | -0.45 | |||
| Type | Thickness | Colour | Temperature | PCT | SST | Characteristic |
| Zn | 5-10μm | Blue Silver | ≤160℃ | — | ＞48hr | protection for most products |
| Ni＋Sn | 10-30μm | Semibright Silver | ≤160℃ | ＞48hr | ＞96hr | excellent climate&salt spray resistance |
| Ni | 10-30μm | Blue Silver | ≤200℃ | ＞48hr | ＞96hr | excellent climate&salt spray resistance , suitable for clean-room |
| Al Spraying | 6-20μm | Dark Silver | ≤200℃ | — | ＞288hr | superior resistance to salt &humid atmosphere suitable for big size or anomalous magnets |
| IVD Al | 10-30μm | Silver White | ≤400℃ | ＞48hr | ＞288hr | superior resistance to salt&humid atmosphere , thickness equality , excellent adhesive attraction |
| Epoxy | 10-30μm | Black Gray | ≤120℃ | ＞48hr | ＞96hr | well climate&salt spray resistance |
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④. Technical capacity: With special R&D department and leading technologies. |