2015年8月26日星期三

strong rare earth smco magnet R30xr8x4mm

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
smco magnet
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. 
The max recommended operating temperatures listed on the Samarium Cobalt magnetic characteristics list above do not take into account all geometry conditions.
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 
strong rare earth smco magnet R30xr8x4mm
2. diametrically
strong rare earth smco magnet R30xr8x4mm
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
strong rare earth smco magnet R30xr8x4mm
“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
strong rare earth smco magnet R30xr8x4mm
2. diametrically for ring
strong rare earth smco magnet R30xr8x4mm
Radial Magnetization:
True Radially Magnetized Ring
strong rare earth smco magnet R30xr8x4mm
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:
strong rare earth smco magnet R30xr8x4mm
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
strong rare earth smco magnet R30xr8x4mm
2. diamterially magnetizing for arc or radial arc
strong rare earth smco magnet R30xr8x4mm
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.) 
strong rare earth smco magnet R30xr8x4mm



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.
strong rare earth smco magnet R30xr8x4mm



Radially IN / Radially Out:
strong rare earth smco magnet R30xr8x4mm
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.
strong rare earth smco magnet R30xr8x4mm
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.

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