Formulated in the 1960s, the samarium cobalt SmCo magnets. These are rare-earth permanent magnets constructed by alloying, crushing, pressing, sintering, and other processes using a mixture of cobalt, samarium, and other metal rare earth elements.
Due to the versatility, high coercivity, and exceptional temperature stability (250°C (523 K) and 550°C (823 K)); Curie temperatures from 700°C (973 K) to 800°C (1,070 K) of this magnet, it's used in multiple fields and products. To know what are samarium cobalt magnets used for, keep reading this article.
Types of Samarium Cobalt Magnets
Mainly there are two types of samarium cobalt magnets. These include:
SmCo₅
The samarium-to-cobalt ratio in this particular samarium-cobalt magnet is 1:5. For instance, for every samarium atom used, five cobalt atoms are used. This 1.5 SmCo₅ is produced by first melting a mixture of cobalt, samarium, praseodymium, and gadolinium. Then, the mixture consisting of SmCo is ground, pressed, and sintered.
While the coercivity of a magnet is typically determined by its composition, shape, and size, synthesizing phase-pure SmCo₅ with ideal size and high coercivity is a demanding task. If you're looking for a magnet for this goal, SmCo₅ is among the most promising choices.
Sm₂Co₁₇
Sm₂Co₁₇ magnet, the second series of samarium cobalt magnets, has an MGOe range of 22–30. Samarium and cobalt are the basic components of Sm₂Co₁₇, which also includes copper, hafnium, iron, sometimes praseodymium, and zirconium. The samarium-to-cobalt ratio in this particular samarium-cobalt Sm₂Co₁₇ magnet is 2:7. This increases two samarium atoms for every seven cobalt atoms.
Sm₂Co₁₇ magnets, which include iron, might suffer some surface corrosion when submerged in water. To make it corrosion-proof, apply a layer of nickel, copper, then nickel again. This samarium cobalt magnet type was found later than SmCo5, but its strength has made it more common.
Extra Information
Permanent magnets made of samarium cobalt are very powerful. Their optimal operating temperature range is 523 K to 823 K, and they are robust to high temperatures as well. Samarium magnets also have excellent resistance to oxidation, demagnetization, and corrosion.
For these magnets, 1,070 K is the Curie temperature. Moreover, their specific gravity is 8.4 × 10¹ kg/m². Samarium cobalt magnets also have a high electrical resistance, which is an interesting characteristic.
Their resistance to electrical current is 0.8 × 10⁻⁶ Ωm. In addition, its compressive strength is 9.1 × 10¹ kg/m², and its bending strength is 1.2 × 10² kg/m. In the presence of tension, this rare-earth magnet is prone to breaking or cracking. Magnets made of samarium cobalt are anisotropic. Their preferred direction of magnetization is evident from this. They are not magnetic in directions other than their own.
Uses of Samarium Cobalt Magnets
Due to their versatility, samarium magnets are used widely in multiple industries for various purposes. From getting used in refrigerators to sensors, these magnets have been proven to be useful for industrial use. Here's what are samarium cobalt magnets used for:
Sensors
When talking about the uses of samarium cobalt SmCo magnets, you must know that the most commonly used application is sensors. These magnets in sensors detect and convert magnetic fields into electrical signals.
Moreover, such magnetic sensors are also used in multiple industries, including aerospace, automotive, and even locks and security.
The preference for using these magnets in sensors is because of the high-temperature stability they provide. Furthermore, they are corrosion-resistant and provide consistent outflow even in harsh environments.
Nuclear Magnetic Resonance Spectrometer
NMR spectrometers are used to analyze the structures of molecular interactions as well as organic compounds in biology, chemistry, and wherever protons and neutrons are used.
The use of SmCo magnets in these spectrometers can help in achieving precise and reliable measurements. Hence, the results can be very helpful in industries like pharmaceutical, medical diagnostics, etc.
Generators and Refrigerators
The next use of samarium magnets is found in generators. These permanent magnets provide a reliable magnetic field for energy conversion. To further elaborate on the uses of these magnets in generators, samarium cobalt supports the performance of wind turbines.
Moreover, these rare-earth magnets are used in military power systems because of their high heat resistance. Generators with samarium cobalt SmCo magnets can endure up to 550°C, making them a great choice for high-powered generators in harsh environments.
Although not as widely used as generators, refrigerators are a potent appliance in which the use of samarium cobalt rare earth magnets is being researched. To narrow it down, the magnets are used in solid-state cooling systems and enhance the performance of the overall appliance when compared to traditional compressors.
Medical Equipment
In order to sterilize medical equipment, samarium cobalt magnets are used. This is because, even when heated, samarium cobalt rare earth magnets retain their stability. Moreover, these rare-earth magnets are used in medical equipment, including surgical instruments, MRI machines, and diagnostic devices.
Robotic Arms
Due to being reliable and durable, there's a vast possibility of the use of samarium cobalt magnets in robotic arms. With technological advancements, robotic arms are being used in many industries, medicine being one of the most important ones. Fields requiring that much precision and motion control need to be made with guaranteed material and samarium cobalt magnets come in handy in that selection.
Advantages of Samarium Cobalt Magnets
Now that you know what are samarium cobalt magnets used for in various industries, let's look at their strengths and advantages:
Durable
The fundamental resistance to corrosion is a major reason why samarium magnets are famously reliable and long-lasting. Because of the fast degradation that less resistant materials undergo from exposure to humidity, chemicals, and fluctuating temperatures, this quality is very useful in severe situations, including maritime settings, automotive applications, and industrial gear.
Applications where dependability and accuracy are of the utmost importance, such as high-precision sensors, medical equipment, and aircraft components, need this stability.
High-Temperature Tolerance
Samarium cobalt rare earth magnets are engineered to function well in high-temperature settings; they can endure temperatures as high as 550°C without substantially weakening their magnetic properties.
Components used in airplanes, automobiles, and industrial machines must be able to withstand very high temperatures, and SmCo magnets come in handy here. The reliable operation of vital equipment such as motors and sensors depends on the magnetic characteristics being steady in these types of settings.
High Energy Density
The energy density of samarium magnets is typically high, ranging from 16 to 30 MJ/m³. Because of their compact size and high magnetic characteristics, they are ideal for applications where a strong magnetic field is needed in confined places.
The magnets can maintain their magnetic characteristics in a wide range of temperatures, and they are also heat-tolerant. Their ability to withstand high temperatures and extreme fluctuations makes them perfect for use in the production of electronic components and gadgets. In addition, the coercivity and demagnetization resistance of SmCo magnets are well-known properties.
Size Efficiency
The small size and great magnetic performance of samarium cobalt magnets have made them famous. When there is a severe lack of room yet a critical need for high magnetic characteristics, this quality becomes invaluable.
For example, devices like speakers, motors, and electromagnetic sensors in consumer electronics like cell phones and tabs rely on small yet strong magnets. In order to improve the user experience without sacrificing performance, devices can be designed with smaller, thinner, and increasingly powerful SmCo magnets because of their substantial magnetic strength at smaller diameters.
Cost-Efficient
Because of the high cost of raw materials and the complicated nature of their production process, samarium cobalt magnets are often more costly than other kinds of magnets, such as Neodymium Iron Boron (NdFeB) magnets. Although SmCo magnets have a greater initial cost, their outstanding performance makes up for it.
Their entire worth is further enhanced by their long-lasting nature and little maintenance needs. With little maintenance, SmCo magnets retain their integrity throughout time, unlike other kinds of magnets that may need replacement or extra coatings to avoid corrosion. This initial high cost is compensated by the long-term use without any repairs and maintenance.
Get High-quality Samarium Cobalt Magnets from GME
Electronics, sensor, and precision equipment manufacturers rely heavily on samarium cobalt magnets. They are well-suited for use in electronic device production due to their exceptional magnetic characteristics, longevity, dependability, and stability in a range of temperature conditions.
Does your business need reliable samarium cobalt magnets? Samarium cobalt magnets from GME are known for their long lifespan, reliability, and affordability.
GME aspires to be the global samarium cobalt magnet manufacturer leader. No matter what industry your business is in, we're confident that we can help you by being your supplier.
As a manufacturer and distributor of permanent magnets, GME was established to promote the advancement of magnet technology. By communicating directly with you and concentrating on a market-driven product range.
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