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Samarium Cobalt Rare Earth Magnets

Name: China Samarium Cobalt Rare Earth Magnets Manufacturers, Suppliers and Factory - Everbeen Magnet Electron
Brand: Everbeen
SKU: 234043249

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Products Description

Samarium Cobalt (SmCo) magnets are a type of rare-earth magnet made primarily from the alloys of samarium (Sm) and cobalt (Co). Known for their exceptional magnetic properties and superior performance in high-temperature environments, SmCo magnets are widely used in various advanced applications, including aerospace, defense, medical devices, and high-performance electric motors.

Composition and Structure

Samarium cobalt magnets are primarily composed of samarium and cobalt, with small amounts of other rare earth elements like cerium or praseodymium sometimes added to enhance the properties. There are two main types of SmCo magnets: SmCo 1:5 (which contains one atom of samarium for every five atoms of cobalt) and SmCo 2:17 (which contains two atoms of samarium for every 17 atoms of cobalt). The specific ratio influences the magnet's magnetic strength, thermal stability, and other performance characteristics.

Magnetic Characteristic of SmCo Rare Earth Magnets

Material	Grades	Remanence		Coercive Force	Intrinsic Coercivity		Maximum Energy product		Curie Temp	Working Temp	Temp Coefficient Of Br	Temp Coefficent Of Hcj
Material	Grades	Br		Hcb	Hcj		(BH)max		TC	TW	Temp Coefficient Of Br	Temp Coefficent Of Hcj
SmCo 1:5		T	Gs	Koe	KA/m	Koe	KJ/m	Mgoe	℃	℃	%℃	%℃
	YX-16	0.81-0.85	8.1-8.5	7.8-8.3	1194-1830	15-23	110-127	14-16	750	250	-0.05	-0.3
	YX-18	0.85-0.9	8.5-9.0	8.3-8.8	1194-1830	15-23	127-143	16-18	750	250	-0.05	-0.3
	YX-20	0.9-0.094	9.0-9.4	8.5-9.1	1194-1830	15-23	150-167	19-21	750	250	-0.05	-0.3
	YX-22	0.92-0.96	9.2-9.6	8.9-9.4	1194-1830	15-23	160-175	20-22	750	250	-0.05	-0.3
	YX-24	0.96-1.0	9.6-10.0	9.2-9.7	1194-1830	15-23	175-190	22-24	750	250	-0.05	-0.3
SmCo 2:17	YXG-24H	0.95-1.02	9.5-10.2	8.7-9.4	1990	25	175-191	22-24	800	350	-0.03	-0.2
	YXG-26H	1.02-1.05	10.2-10.5	9.4-9.8	1990	25	191-207	24-26	800	350	-0.03	-0.2
	YXG-28H	1.03-1.08	10.3-10.8	9.5-10	1990	25	207-220	26-28	800	350	-0.03	-0.2
	YXG-30H	1.08-1.10	10.8-11.0	9.9-10.5	1990	25	220-240	28-30	800	350	-0.03	-0.2
	YXG-24	0.95-1.02	9.5-10.2	8.7-9.4	1433	18	175-191	22-24	800	300	-0.03	-0.2
	YXG-26	1.02-1.05	10.2-10.5	9.4-9.8	1433	18	191-207	24-26	800	300	-0.03	-0.2
	YXG-28	1.03-1.08	10.3-10.8	9.5-10	1433	18	207-220	26-28	800	300	-0.03	-0.2
	YXG-30	1.08-1.10	10.8-11.0	9.9-10.5	1433	18	220-240	28-30	800	300	-0.03	-0.2
	YXG-26M	1.02-1.05	10.2-10.5	9.4-9.8	955-1273	12--16	191-207	24-26	800	300	-0.03	-0.2
	YXG-28M	1.03-1.08	10.3-10.8	9.5-10	955-1274	12--16	207-220	26-28	800	300	-0.03	-0.2
	YXG-30M	1.08-1.10	10.8-11.0	9.9-10.5	955-1275	12--16	220-240	28-30	800	300	-0.03	-0.2
	YXG-28L	1.02-1.08	10.2-10.8	5.2-9.0	438-796	5.5-10	207-220	26-28	800	250	-0.03	-0.2
	YXG-30L	1.08-1.15	10.8-11.5	5.2-9.0	438-796	5.5-10	220-240	28-30	800	250	-0.03	-0.2

Main Properties of Samarium Cobalt magnets

High Magnetic Strength:

Typically in the range of 20 to 32 MGOe (Mega Gauss Oersteds). This makes them stronger than other types of permanent magnets, such as ferrite or alnico magnets, and suitable for applications requiring compact, powerful magnets.

Excellent Temperature Stability: One of the most significant advantages of SmCo magnets is their resistance to demagnetization at high temperatures. They can operate at temperatures ranging from -50°C to 300°C (or higher for certain grades), making them ideal for high-temperature environments. Unlike other magnets that lose their magnetic properties when exposed to heat, SmCo magnets maintain their performance even in challenging conditions.
Corrosion Resistance: SmCo magnets do not require additional coatings or plating to resist corrosion, unlike other materials such as NdFeB (neodymium-iron-boron) magnets. This makes them suitable for use in harsh environments, including underwater or in corrosive industrial settings.
High Resistance to External Demagnetizing Fields: They exhibit excellent resistance to external magnetic fields, making them stable and reliable over time. This feature is essential in precision applications where the magnetic field needs to remain constant and unaffected by external factors.
High Coercivity: It means they are difficult to demagnetize. This property makes them highly stable over time and reduces the likelihood of losing their magnetization under typical use conditions.
Size and Shape Versatility: SmCo magnets can be produced in various shapes, including discs, blocks or Bar magnet, rings, and custom designs. Their high energy density allows them to be made in smaller sizes while still maintaining strong magnetic properties.

Other sizes and shapes are customized according to requests and designs

Smco disc magnets

Block smco magnet

What inspection process Everbeen Magnet can provide to Customers?

Demagnetized Curve, inspection report including dimension and Gauss data, PCT Test report if necessary.

PCT TEST Report for SMCO

FAQ1

Q: Does smco magnet has disadvantage and limitations?

Yes, SmCo (Samarium Cobalt) magnets have several disadvantages and limitations despite their excellent magnetic properties. Please view here:

1. High Cost

SmCo magnets are expensive due to the high cost of raw materials (samarium and cobalt) and complex manufacturing processes. This makes them less cost-effective compared to alternatives like NdFeB (Neodymium) magnets.

2. Brittle and Fragile

SmCo magnets are very brittle and can easily crack or break under mechanical stress, impact, or improper handling. This limits their application in environments with high mechanical loads or vibrations.

3. Lower Maximum Energy Product (Compared to NdFeB)

Although SmCo magnets have high energy density, they are not as strong as Neodymium magnets. This means they may not be the best choice when maximum magnetic strength is required.

4. Limited Shapes and Sizes

Due to their brittleness, SmCo magnets are challenging to machine into complex shapes, which restricts design flexibility. Special manufacturing processes, such as EDM (electrical discharge machining), are often required for custom shapes.

5. Corrosion Resistance Varies

SmCo magnets have better corrosion resistance than NdFeB magnets and typically don't require coatings. However, in highly acidic or humid environments, they can still corrode over time, especially lower-grade SmCo materials.

6. Lower Availability

Compared to NdFeB magnets, SmCo magnets are less commonly produced and may have longer lead times for procurement, making them less convenient for mass production.

7. Temperature Sensitivity in Some Grades

Although SmCo magnets can withstand high temperatures (up to 350°C or higher), some lower-grade SmCo materials may experience slight performance degradation at extreme temperatures.

FAQ2

Q: Can the Samarium Cobalt magnets coated with Nickel?

Yes, Samarium Cobalt (SmCo) magnets can be coated with nickel, but they don't always need it.

Why Use Nickel Coating?

Added Durability: Nickel adds a tough, wear-resistant layer to protect against mechanical damage or cracking.

Smoother Surface: Makes the surface more uniform, which helps with assembly or bonding to other components.

Extra Corrosion Protection: While SmCo is already resistant to oxidation, nickel coating provides an extra layer of protection in harsh environments (like salt spray or extreme humidity).

Common Coating Options:

Ni-Cu-Ni (Nickel-Copper-Nickel): A triple-layer coating that enhances durability and corrosion resistance.

Gold or Epoxy: For ultra-high corrosion resistance or medical applications.

When Coating is Useful:

High Humidity/Marine Environments: Extra protection is valuable in wet or corrosive environments.

Precision Assemblies: A coating can make handling and installation easier.

High-Contact Applications: Where magnets might rub against other components.

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