long arc magnet, samarium cobalt magnets

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. 

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 

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.