Rare earth Sintered NdFeB magnet:
Sintered NdFeB Magnet is one of the high performance rare earth permanent magnets, which use neodymium (ND), iron (Fe), and boron (B) as their main ingredients and is susceptible to demagnetization when exposed to elevated temperatures. There are many grades which can withstand high temperatures, but several factors will dictate the performance of the Neodymium magnet. There are Sintered NdFeB, Sintered AlNiCo, Sintered SmCo.
Sintered NdFeB Magnet is one of the high performance rare earth permanent magnets, which use neodymium (ND), iron (Fe), and boron (B) as their main ingredients and is susceptible to demagnetization when exposed to elevated temperatures. There are many grades which can withstand high temperatures, but several factors will dictate the performance of the Neodymium magnet. There are Sintered NdFeB, Sintered AlNiCo, Sintered SmCo.
| Magnetic properties of Sintered Neodymium Magnet (NdFeB magnet): | |||||
| Grade | Remanence | CoerciveForce | IntrinsicCoerciveForce | Max.energyproduct | Max. Operating Temperature |
| Br mT (kGs) | Hcb kA/m (kOe) | Hcj kA/m (kOe) | (BH)maxkJ/m 3 (MGOe) | Tw | |
| N35 | 1170-1220 (11.7-12.2) | ≥868 (≥10.9) | ≥955 (≥12) | 263-287 (33-36) | 80deg |
| N38 | 1220-1250 (12.2-12.5) | ≥899 (≥11.3) | ≥955 (≥12) | 287-310 (36-39) | 80deg |
| N40 | 1250-1280 (12.5-12.8) | ≥907 (≥11.4) | ≥955 (≥12) | 302-326 (38-41) | 80deg |
| N42 | 1280-1320 (12.8-13.2) | ≥915 (≥11.5) | ≥955 (≥12) | 318-342 (40-43) | 80deg |
| N45 | 1320-1380 (13.2-13.8) | ≥923 (≥11.6) | ≥955 (≥12) | 342-366 (43-46) | 80deg |
| N48 | 1380-1420 (13.8-14.2) | ≥923 (≥11.6) | ≥876 (≥12) | 366-390 (46-49) | 80deg |
| N50 | 1400-1450 (14.0-14.5) | ≥796 (≥10.0) | ≥876 (≥11) | 382-406 (48-51) | 60deg |
| N52 | 1430-1480 (14.3-14.8) | ≥796 (≥10.0) | ≥876 (≥11) | 398-422 (50-53) | 60deg |
| 30M | 1080-1130 (10.8-11.3) | ≥796 (≥10.0) | ≥1114 (≥14) | 223-247 (28-31) | 100deg |
| 33M | 1130-1170 (11.3-11.7) | ≥836 (≥10.5) | ≥1114 (≥14) | 247-263 (31-33) | 100deg |
| 35M | 1170-1220 (11.7-12.2) | ≥868 (≥10.9) | ≥1114 (≥14) | 263-287 (33-36) | 100deg |
| 38M | 1220-1250 (12.2-12.5) | ≥899 (≥11.3) | ≥1114 (≥14) | 287-310 (36-39) | 100deg |
| 40M | 1250-1280 (12.5-12.8) | ≥923 (≥11.6) | ≥1114 (≥14) | 302-326 (38-41) | 100deg |
| 42M | 1280-1320 (12.8-13.2) | ≥955 (≥12.0) | ≥1114 (≥14) | 318-342 (40-43) | 100deg |
| 45M | 1320-1380 (13.2-13.8) | ≥995 (≥12.5) | ≥1114 (≥14) | 342-366 (43-46) | 100deg |
| 48M | 1360-1430 (13.6-14.3) | ≥1027 (≥12.9) | ≥1114 (≥14) | 366-390 (46-49) | 100deg |
| 50M | 1400-1450 (14.0-14.5) | ≥1033 (≥13.0) | ≥1114 (≥14) | 382-406 (48-51) | 100deg |
| 30H | 1080-1130 (10.8-11.3) | ≥796 (≥10.0) | ≥1353 (≥17) | 223-247 (28-31) | 120deg |
| 33H | 1130-1170 (11.3-11.7) | ≥836 (≥10.5) | ≥1353 (≥17) | 247-271 (31-34) | 120deg |
| 35H | 1170-1220 (11.7-12.2) | ≥868 (≥10.9) | ≥1353 (≥17) | 263-287 (33-36) | 120deg |
| 38H | 1220-1250 (12.2-12.5) | ≥899 (≥11.3) | ≥1353 (≥17) | 287-310 (36-39) | 120deg |
| 40H | 1250-1280 (12.5-12.8) | ≥923 (≥11.6) | ≥1353 (≥17) | 302-326 (38-41) | 120deg |
| 42H | 1280-1320 (12.8-13.2) | ≥955 (≥12.0) | ≥1353 (≥17) | 318-342 (40-43) | 120deg |
| 45H | 1300-1360 (13-13.6) | ≥963 (≥12.1) | ≥1353 (≥17) | 326-358 (43-46) | 120deg |
| 48H | 1370-1430 (13.7-14.3) | ≥995 (≥12.5) | ≥1353 (≥17) | 366-390 (46-49) | 120deg |
| 30SH | 1080-1130 (10.8-11.3) | ≥804 (≥10.1) | ≥1592 (≥20) | 223-247 (28-31) | 150deg |
| 33SH | 1130-1170 (11.3-11.7) | ≥844 (≥10.6) | ≥1592 (≥20) | 247-271 (31-34) | 150deg |
| 35SH | 1170-1220 (11.7-12.2) | ≥876 (≥11.0) | ≥1592 (≥20) | 263-287 (33-36) | 150deg |
| 38SH | 1220-1250 (12.2-12.5) | ≥907 (≥11.4) | ≥1592 (≥20) | 287-310 (36-39) | 150deg |
| 40SH | 1240-1280 (12.5-12.8) | ≥939 (≥11.8) | ≥1592 (≥20) | 302-326 (38-41) | 150deg |
| 42SH | 1280-1320 (12.8-13.2) | ≥987 (≥12.4) | ≥1592 (≥20) | 318-342 (40-43) | 150deg |
| 45SH | 1320-1380 (13.2-13.8) | ≥1003 (≥12.6) | ≥1592 (≥20) | 342-366 (43-46) | 150deg |
| 28UH | 1020-1080(10.2-10.8) | ≥764 (≥9.6) | ≥1990 (≥25) | 207-231 (26-29) | 180deg |
| 30UH | 1080-1130(10.8-11.3) | ≥812 (≥10.2) | ≥1990 (≥25) | 223-247 (28-31) | 180deg |
| 33UH | 1130-1170 (11.3-11.7) | ≥852 (≥10.7) | ≥1990 (≥25) | 247-271 (31-34) | 180deg |
| 35UH | 1180-1220 (11.8-12.2) | ≥860 (≥10.8) | ≥1990 (≥25) | 263-287 (33-36) | 180deg |
| 38UH | 1220-1250 (12.2-12.5) | ≥876 (≥11.0) | ≥1990 (≥25) | 287-310 (36-39) | 180deg |
| 40UH | 1240-1280 (12.5-12.8) | ≥899 (≥11.3) | ≥1990 (≥25) | 302-326 (38-41) | 180deg |
| 28EH | 1040-1090 (10.4-10.9) | ≥780 (≥9.8) | ≥2388 (≥30) | 207-231 (26-29) | 200deg |
| 30EH | 1080-1130(10.8-11.3) | ≥812 (≥10.2) | ≥2388 (≥30) | 223-247 (28-31) | 200deg |
| 33EH | 1130-1170 (11.3-11.7) | ≥836 (≥10.5) | ≥2388 (≥30) | 247-271 (31-34) | 200deg |
| 35EH | 1170-1220 (11.7-12.2) | ≥876 (≥11.0) | ≥2388 (≥30) | 263-287 (33-36) | 200deg |
| 38EH | 1220-1250 (12.2-12.5) | ≥899 (≥11.3) | ≥2388 (≥30) | 287-310 (36-39) | 200deg |
| 30AH | 1080-1120 (10.8-11.2) | ≥812 (≥10.2) | ≥2785 (≥35) | 223-255 (28-32) | 220deg |
| 33AH | 1120-1170 (11.2-11.7) | ≥812 (≥10.2) | ≥2785 (≥35) | 247-271 (31-34) | 220deg |
| PhysicalandMechanicalPropertiesofNeodymiumMagnet: | |||||
| ThermalConductivity | 7.7kcal/m-h-° C | ||||
| Young' sModulus | 1.7x104kg/mm2 | ||||
| BendingStrength | 24kg/mm2 | ||||
| CompressiveStrength | 80kg/mm2 | ||||
| ElectricalResistivity | 160µ -ohm-cm/cm2 | ||||
| Density | 7.4-7.55g/cm3 | ||||
| VickersHardness | 500-600 | ||||
| Available coatings for sintered Neodymium Magnet (NdFeB magnet): | |||||
| AvailableCoatings: | |||||
| Surface | Coating | Thickness(Microns) | Color | Resistance | |
| Passivation | 1 | SilverGrey | TemporaryProtection | ||
| Nickel | Ni+Ni | 10.0-20 | BrightSilver | ExcellentagainstHumidity | |
| Ni+Cu+Ni | |||||
| Zinc | Zn | 8.0-20 | BrightBlue | GoodAgainstSaltSpray | |
| C-Zn | ShinnyColor | ExcellentAgainstSaltSpray | |||
| Tin | Ni+Cu+Sn | 15-20 | Silver | SuperiorAgainstHumidity | |
| Gold | Ni+Cu+Au | 10.0-20 | Gold | SuperiorAgainstHumidity | |
| Copper | Ni+Cu | 10.0-20 | Gold | TemporaryProtection | |
| Epoxy | Epoxy | 15-25 | Black,Red,Grey | ExcellentAgainstHumidity &SaltSpray | |
| Ni+Cu+Epoxy | |||||
| Zn+Epoxy | |||||
| Chemical | Ni | 10.0-20 | SilverGrey | ExcellentAgainstHumidity | |
| Parylene | Parylene | 5.0-20 | Grey | ExcellentAgainstHumidity,SaltSpray.SuperiorAgainstSolvents,Gases,FungiandBacteria. FDAApproved. | |
