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Sintered Samarium Cobalt (SmCo) magnets fall into
two groups of chemical composition: SmCo5 and Sm2Co17. Armstrong Magnetics
accepts orders for custom Samarium Cobalt magnets as per customer design
Samarium Cobalt magnets offer super
combination of
extremely high magnetic standard, excellent thermal stability and distinguished
corrosion resistance. Sm2Co17 is better than SmCo5 in all respects. Because of
these merits, Samarium Cobalt magnets are ideal component specially in
applications where temperature changes across a broad range or environment is
corrosive, such as chemical pump couplings.
Samarium Cobalt magnets are extremely powerful
The (BH)max of Sm2Co17 is up to 30 MGOe and its Br up to11,000 Gauss.
Samarium Cobalt magnets have very high
resistance to demagnetization
Maximum Hci of Samarium Cobalt magnets are as high as 25 KOe.
Samarium Cobalt magnets are suitable for heat
applications
Reversible temperature coefficient is -.03 ~ -.0435 of Br/°C.
Maximum working temperature is 250 ~ 300°C,
under which Samarium Cobalt magnets maintain good magnetic property to
temperature changing.
Samarium
Cobalt magnets have outstanding resistance to corrosion
There is no need of surface treatment to Samarium Cobalt magnets even if they
will work in humid environments.
Samarium
Cobalt magnets are hard and brittle
It is not possible to machine Samarium Cobalt magnets with conventional
machining. Samarium
Cobalt magnets can be abrasively machined with coolant
served to absorb heating and dust. Without coolant, rare earth magnets
could crack and chip by the heat produced during high speed cutting or
grinding, and the sparks contain the easily oxidized grinding dust that
could cause fire!
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Very powerful.
High working
Temperature.
Extremely resistant to
demagnetization.
Resistant to corrosion
Most expensive. |
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Samarium Cobalt Properties
1. SmCo5 materials:
|
Grade
|
Br (Gauss)
|
Hc
(Oe)
|
Hci
(Oe)
|
(BH)max
(MGO)
|
Tw (Max
workingTemp.) (°F/°C)
|
Tc (Curie Temp.)
(°F/°C) |
Br Temp Coef
(%/°C) |
Hc Temp Coef (%/°C) |
|
18
|
8,500- 9,000 |
8,300-8,800 |
15,000-23,000 |
16-18
|
482/250
|
1,382/750 |
-0.05 |
-0.3 |
|
20
|
9,000- 9,400
|
8,500-9,100 |
15,000-23,000 |
19-21 |
482/250
|
1,382/750 |
-0.05 |
-0.3 |
|
22
|
9,000- 9,600
|
8,900-9,400 |
15,000-23,000 |
20-22 |
482/250
|
1,382/750 |
-0.05 |
-0.3 |
|
24
|
9,600-10000 |
9,200-9,700 |
15,000-23,000 |
22-24 |
482/250
|
1,382/750 |
-0.05 |
-0.3 |
2. Sm2Co17 materials:
|
Grade
|
Br (Gauss)
|
Hc
(Oe)
|
Hci
(Oe)
|
(BH)max
(MGO)
|
Tw (Max
workingTemp.) (°F/°C)
|
Tc (Curie Temp.)
°F/°C) |
Br Temp Coef
(%/°C) |
Hc Temp Coef (%/°C) |
|
24
|
9,500- 10,200 |
8,700-9,400 |
≥18,000 |
22-24
|
572/300
|
1,472/800 |
-0.03 |
-0.2 |
|
26
|
10,200-10,500
|
9,400-9,800 |
≥18,000 |
24-26 |
572/300 |
1,472/800 |
-0.03 |
-0.2 |
|
28 |
10,300-10,800 |
9,500-10,000 |
≥18,000 |
26-28 |
572/300 |
1,472/800 |
-0.03 |
-0.2 |
|
30 |
10,800-11,000 |
9,900-10,500 |
≥18,000 |
28-30 |
572/300 |
1,472/800 |
-0.03 |
-0.2 |
|
24H |
9,500-10,200 |
8,700-9,400 |
≥25,000 |
22-24 |
662/350 |
1,472/800 |
-0.03 |
-0.2 |
|
26H |
10,200-10,500
|
9,400-9,800 |
≥25,000 |
24-26 |
662/350 |
1,472/800 |
-0.03 |
-0.2 |
|
28H |
10,300-10,800 |
9,500-10,000 |
≥25,000 |
26-28 |
662/350 |
1,472/800 |
-0.03 |
-0.2 |
|
30H
|
10,800-11,000 |
9,900-10,500 |
≥25,000 |
2830 |
662/350
|
1,472/800 |
-0.03 |
-0.2 |
3. SmCo5 materials
with Low Temperature Coefficient:
|
Grade
|
Br (Gauss)
|
Hc
(Oe)
|
Hci (Oe)
|
(BH)max
(MGO)
|
Tw (Max
workingTemp.) (°F/°C)
|
Tc (Curie Temp.) (°F/°C) |
Br Temp Coef (%/°C) |
|
10LTC
|
5,900-6,300 |
5,800-6,200 |
18,000-23,000 |
8.5-10 |
482/250
|
1,292/700 |
20-100°C:
-0.004 100-200°C: -0.021
200-300°C:
-0.042 |
4. Sm2Co17 materials with Low Temperature Coefficient:
|
Grade
|
Br (Gauss)
|
Hc (Oe)
|
Hci (Oe)
|
(BH)max
(MGO)
|
Tw (Max
workingTemp.) (°F/°C)
|
Tc (Curie Temp.) (
°F/°C) |
Br Temp Coef (%/°C) |
|
22LTC
|
9,400-9,800 |
8,400-9,000 |
15,000-20,000 |
21-23 |
572/300
|
1,544/840 |
-50-25°C:
+0.005
20-100°C:
+0.012
100-200°C: +0.006
200-300°C:
-0.025 |
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