The best quality and customer satisfaction are our first priority.
Size: 30x4.4x8mm
Grade: GMEsmco30
Magnetized through 4.4mm
Standard tolerance
Work temperature: 300-350 degree
About SmCo magnet:
SmCo magnet are made of samarium and cobalt and other rare earth elements.
Constitution: 35% Sm, 60% Co and 5% Fe and Cu
Production chart: Raw material---Mixing---Vacuum melting---Powder production---Molding---
Vacuum sintering---Testing---Cutting and Grinding---Surface coating---Inspection---Packing---Shipping
Grade: GMEsmco21:5(GMEsmco16, GMEsmco18, GMEsmco20, GMEsmco22,GMEsmco24),
(GMEsmco2:17 GMEsmco24, GMEsmco26, GMEsmco28, GMEsmco30,GMEsmco32)
Share: Disc, Ring, Block, segment, Cylinder, Trapezoid, Customized design(Design proper magnets for clients specific requirements)
Characteristics: High performance,high working temperature 350 degree ,
It doesn’t need to be coated because it is difficult to be eroded and oxidized.
Application: Motors, Aviation and spaceflight, National defense and military affairs, Microwave appliance,
Medical apparatus, Auto industry, Machine gearings, sensors, meters and instruments.
strong rare earth smco magnet R30xr8x4mm
Corrosion Resistance of Samarium Cobalt Magnets (SmCo)
Samarium Cobalt Magnets (SmCo) are very resistant to corrosion and do not normally require any surface treatment, like neodymium magnet, .
For most applications a coating or plating is not required though,
but it should be considered when operating in environments that are acidic, have high moisture, or are in a vacuum.
Coatings and metal platings will increase the ability to clean the magnet and metal plating allow for greater cleanliness for vacuum and medical applications.
Nickel plating fasciculate soldering the magnet and this is especially used for adhesion to a printed circuit board.
Samarium Cobalt magnets (SmCo) with parylene coating is a good choice for Medical and Aerospace applications, because of low environmental reactivity.
Material
|
Grade
|
Remanence
|
Coercivity
|
Intrinsic
Coercivity
|
Max Energy
Product
|
Density
|
Temp Coefficient
(Near Br)
|
Temp
Coefficient
|
Curie
Temp
|
Max Operating
Temp (TW)
|
（Br)
|
(Hcj)
|
（Hcb)
|
(BHmax)
|
(D)
|
（Near Hcj)
|
(TC)
|
mT
|
Gs
|
KA/m
|
Oe
|
KA/n
|
Oe
|
KJ/m3
|
MGOe
|
g/cm3
|
%/K
|
%/K
|
°C
|
°C
|
SmCo1:5
|
SmCo18
|
840
|
8400
|
605
|
7600
|
1432
|
18000
|
143
|
18
|
8.1
|
-0.04
|
-0.3
|
750
|
250
|
(SmPr)CO5
|
SmCo20
|
890
|
8900
|
637
|
8000
|
1432
|
18000
|
159
|
20
|
8.2
|
-0.04
|
-0.3
|
750
|
250
|
|
SmCo22
|
930
|
9300
|
637
|
8000
|
1432
|
18000
|
175
|
22
|
8.2
|
-0.04
|
-0.3
|
750
|
250
|
|
LTc(HM-10)
|
590
|
630
|
493
|
6200
|
1430
|
1830
|
80
|
10
|
8.2
|
Temp Range
|
Br T.C. %°C
|
700
|
250
|
1:05
|
|
|
|
|
|
|
|
|
|
|
20-100°C
|
-0.004
|
|
|
(SmGd)CO5
|
|
|
|
|
|
|
|
|
|
|
100-200°C
|
-0.021
|
|
|
|
|
|
|
|
|
|
|
|
|
|
200-300°C
|
-0.042
|
|
|
|
SmCo24
|
980
|
9800
|
676
|
8500
|
1432
|
18000
|
191
|
24
|
8.3
|
-0.03
|
-0.2
|
800
|
280
|
|
SmCo24H
|
980
|
9800
|
676
|
8500
|
1989
|
25000
|
191
|
24
|
8.3
|
-0.03
|
-0.2
|
800
|
280
|
|
SmCo26L
|
1030
|
10300
|
398
|
5000
|
438
|
5500
|
207
|
26
|
8.3
|
-0.03
|
-0.2
|
800
|
300
|
|
SmCo26
|
1030
|
10300
|
716
|
9000
|
1194
|
15000
|
207
|
26
|
8.3
|
-0.03
|
-0.2
|
800
|
300
|
SmCo 2:17Sm2
|
SmCo26M
|
1030
|
10300
|
716
|
9000
|
1592
|
20000
|
207
|
26
|
8.3
|
-0.03
|
-0.2
|
800
|
300
|
(CoFeCUZr)17
|
SmCo26H
|
1030
|
10300
|
716
|
9000
|
1989
|
25000
|
207
|
26
|
8.3
|
-0.03
|
-0.2
|
800
|
350
|
|
SmCo28
|
1070
|
10700
|
756
|
9500
|
1194
|
15000
|
223
|
28
|
8.3
|
-0.03
|
-0.2
|
800
|
350
|
|
SmCo28M
|
1070
|
10700
|
756
|
9500
|
1592
|
20000
|
223
|
28
|
8.3
|
-0.03
|
-0.2
|
800
|
350
|
|
SmCo30
|
1100
|
11000
|
772
|
9700
|
1194
|
15000
|
239
|
30
|
8.3
|
-0.03
|
-0.2
|
800
|
350
|
|
SmCo30M
|
1100
|
11000
|
772
|
9700
|
1592
|
20000
|
239
|
30
|
8.3
|
-0.03
|
-0.2
|
800
|
350
|
|
LTc(HMG-22)
|
980
|
9800
|
715
|
9000
|
1500
|
20000
|
230
|
23
|
8.3
|
Temp Range
|
Br T.C. %°C
|
840
|
300
|
|
|
|
|
|
|
|
|
|
|
|
-50-25°C
|
0.005
|
|
|
2:17
|
|
|
|
|
|
|
|
|
|
|
20-100°C
|
0.012
|
|
|
(SmEr)2(CoTM)17
|
|
|
|
|
|
|
|
|
|
|
100-200°C
|
0.006
|
|
|
|
|
|
|
|
|
|
|
|
|
|
200-300°C
|
-0.025
|
|
|
*The effective Maximum Operating Temperature for a Samarium Cobalt Magnet is a function of the magnet’s magnetic characteristics and the geometry of the system (the magnet and the circuit).
The listing maximum operating temperature is a recommendation and infers and ideal geometry and no external demagnetizing fields.
|
Temperature Effects on Samarium Cobalt Magnets (SmCo)
Sintered Samarium Cobalt rare earth magnets operate at temperatures up to 500F (260C), with extremely high resistant to demagnetization.
Though there are many Samarium Cobalt grades withstand higher temperatures,
several factors will dictate the overall performance of the Samarium Cobalt rare earth magnet.
One of the most pertinent variables is the geometry of the magnet or magnetic circuit.
Samarium Cobalt magnets (SmCo) will demagnetize easier than Samarium Cobalt magnets which are thick.
Magnetic geometries utilizing backing plates, yokes, or return path structures will respond better to increased temperatures.
Most useful commercial magnets are anisotropic which means that they have an “Easy” or preferred direction of magnetization
and that an orientation field was applied during the compaction stage of the manufacturing process.
It is essentially impossible to magnetize the resulting anisotropic magnet alloy other than in the Direction of Orientation;
however, various pole configurations can be achieved without conflicting with the magnet material’s orientation.
Below are conventional and standard industry options for the MAGNETIZATION directions of SmCo Rare Earth / Samarium Cobalt Magnets (SmCO).
Disc Geometry/shape
1. axially
2. diametrically
Polarity Nomenclature: Typically the arrowhead indicates the North pole of the magnet.
For symmetric geometries indicating the location of a particular pole is unnecessary, but for non-symmetric geometries identifying a particular pole location is very important.
Example: An axially Magnetized disc magnet does not require communication as to the NORTH pole’s position,
but a radial arc does. One must indicate if the NORTH pole is to reside on the Inner radius or Outer Radius.
Block Magnet /shape
“Block Magnets” or Rectangular / Square magnets have three potential orientation directions.
The block magnet can be polarized in any direction.
Ring Geometry/ shape
1. axially for ring
2. diametrically for ring
Radial Magnetization:
True Radially Magnetized Ring
Radially oriented and magnetized rings are available in Neodymium Iron Boron, but there are many limitations in alloy grade,
Outside Diameter/Inside Diameter ratio, axial, length, etc.
Specialized tooling must be created and there is an upfront capital investment which acts as a cost inhibitor for most applications.
Radial Ring Magnetization Approximation:
Radially Approximated Ring Comprised of Approximated Radial Arc Segments
Samarium Cobalt magnets can be approximated by arcs segments;
however, in most cases the magnets must be assembled magnetized and there must be a large performance benefit to the application to absorb this cost.
As with “True” radial rings, true radial Arc Segments are difficult to manufacture, but can be approximated themselves. See Below.
Arc Segment Geometry / shape
1. Axially for arc
2. diamterially magnetizing for arc or radial arc
An arc segment can be polarized NORTH or SOUTH on the Outside Radius. (The resulting opposite pole will reside on the Inside Radius.)
It is very difficult to achieve a 100% “radial” orientation during the pressing/alignment stage of manufacturing and therefore,
100% radial Neodymium Iron Boron, Samarium Cobalt, and Ceramic magnet arcs are rare and specialized.
(An approximation of a true radial Orientated Radial Arc is widely utilized in industry.)
3. circumferential-arc / or span magnetizing
Circumferential Orientation and Magnetization is not available for Arc magnets comprised of Samarium Cobalt;
however, this magnetization geometry can be approximated.
The approximated radial arc utilizes linear orientation/magnetization along a straight axis.
The radial component diminishes on the leading and trailing edges of the approximated radial arc.
Radially IN / Radially Out:
True Radial Arc Segment
Manufacturing Methods of Samarium Cobalt Magnet:
Fully dense Samarium Cobalt rare earth magnets are usually manufactured by a powdered metallurgical process.
Micron size Samarium Cobalt powder is produced and then compacted in a rigid steel mold.
The steel molds produce shapes similar to the final product, but the mechanical properties of the alloy usually inhibit complex features at this stage of the manufacturing process.
The various elements that compose a samarium cobalt magnet – samarium, cobalt, copper, zinc, and iron.
The Samarium Cobalt’ s magnetic performance is optimized by applying a magnetic field during the pressing operation.
This applied field imparts a preferred direction of magnetization, or orientation to the Samarium Cobalt magnet alloy.
The alignment of particles results in an anisotropic alloy and vastly improves the residual induction (Br) and other magnetic characteristics of the finished magnet.
After pressing, the Samarium Cobalt magnets are sintered and heat treated until they reach their fully dense condition.
The rare earth magnet alloy is then machined to the final dimensional requirements and cleaned.
