| Dimension Range(mm) | Plan view size(mm) | Parallelism(mm) | Perpendicularity (mm) |
| 0.5≤L≤10 | ±0.04 | ±0.04 | 0.5 degree for adjacent sides |
| 10≤L≤50 | ±0.05 | ±0.05 | |
| L>50 | ±0.1 | ±0.1 |
SmCo Magnets
SmCo (Samarium-Cobalt) magnets have obviously more excellent thermal properties compared with NdFeB magnets and also good corrosion resistivity, don’t need surface treatment. Reversible thermal demagnetizing rate of SmCo magnets is 1/4 to 1/3 of that of NdFeB magnets. Some grades of SmCo magnets can be used at over 250℃, SmCo magnets are widely used in automotive parts and in hostile environments like heat resistant motors and precision magnetic sensors.
SMK provides two types of SmCo magnets: 1-5 type and 2-17 type respectively with various grades. For 2-17 type, the cohesive force can be regulated according to the ability of magnetizer .
In addition to general grades, we can also produce magnets whose temperature has little influence on the magnetic properties （-0.008％／℃：20～200℃) ,LT series.
SmCo Magnets( Also known as Samarium-Cobalt, rare earth permanent magnet）
1: 5 type and 2:17 type sintered Samarium Cobalt magnet are the first generation and second generation of rare earth permanent magnet. Sintered Neodymium magnets ruled rare earth permanent magnet market since its birth, therefore, Samarium Cobalt magnet is marginalized seriously as a result of relatively lower magnetic properties, complex processing technologies and high cost. But in reality, sintered Samarium Cobalt magnet is still playing an important role in high-temperature applications which are not possible for sintered Neodymium magnet. The research of high-performance sintered Samarium Cobalt magnet has never stopped, then complex multistage heating treatment and microstructure control effectively enhanced magnetic performance to an extreme level.
Advantage
Manufacturing Process
BH Curve
Standard Specification of SMK Magnetics Sintered SmCo Magnet
Physical Properties
Parameters |
unit |
SmCo5 |
Sm2Co17 |
Density |
g/cm3 |
8.1-8.5 |
8.3-8.5 |
Curie Temperature |
℃ |
700-750 |
800-850 |
Recoil Permeability |
1.00-1.05 |
1.00-1.1 |
|
Hardness |
Hv |
450-500 |
500-600 |
Electrical Resistivity |
Ω·cm |
5-6×10-5 |
8-9×10-5 |
Compressive Strength |
Mpa |
420-680 |
700-830 |
Thermal Conductivity |
W/m·k |
12 |
|
Coefficient of Thermal Expansion(C ⊥) |
10-6/℃ |
13 |
11 |
Coefficient of Thermal Expansion(C //) |
10-6/℃ |
6 |
8 |
Saturation Field |
kA/m |
＞1600 |
＞3200 |
Tolerance
Block
Disk
| Dimension Range(mm) | Cylindricity(mm) | Tolerance(mm) | Parallelism(mm) |
| 1≤D≤5 | ±0.03 | ±0.03 | ±0.04 |
| 5≤D≤25 | ±0.05 | ±0.05 | ±0.05 |
| 25≤D≤50 | ±0.05 | ±0.05 | ±0.05 |
| D>50 | ±0.05 | ±0.1 | ±0.1 |
Ring
| Dimension Range(mm) | Cylindricity(mm) | Tolerance(mm) | Parallelism(mm) |
| 1≤d≤3 | ±0.04 | ±0.04 | ±0.04 |
| 3≤d≤5 | ±0.04 | ±0.04 | ±0.04 |
| 5≤d≤15 | ±0.05 | ±0.05 | ±0.05 |
| d>15 | ±0.1 | ±0.05 | ±0.1 |
Arc
| Item | Dimension Range(mm) | Tolerance (mm) |
| Thickness | T≤10 | ±0.05 |
| 10<T≤25 | ±0.05 | |
| Length | L≤10 | ±0.04 |
| 10< L≤25 | ±0.05 | |
| 25< L≤63 | ±0.05 | |
| L>63 | ±0.07 | |
| Chordal Length | W>63 | ±0.07 |
| W>63 | ±0.07 |
Application
