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Samarium Cobalt Magnet Manufacturer

Samarium cobalt magnet is a kind of rare earth permanent magnet material, which has the characteristics of high-temperature resistance, good thermal stability, and high coercive force. Although the room temperature magnetic properties of samarium cobalt magnets are not as good as those of neodymium iron boron magnets, their thermal stability is more than 10 times that of neodymium iron boron magnets. When the temperature exceeds 150°C, the magnetic energy product, coercive force, and thermal stability of SmCo magnets exceed those of NdFeB magnets. Samarium cobalt is currently a permanent magnet material with high thermal stability.
There are two types of SmCo magnets, SmCo 1:5 and SmCo 2:17.

SmCo5 Magnets
(BH)max values of regular SmCo5 magnet are between 14 and 24MGOe. SmCo5 is made of only Samarium and Cobalt and exhibits better corrosion resistance and machinability.

Sm2Co17 Magnets
(BH)max values of conventional Sm2Co17 magnet are between 22 and 32MGOe which is much higher than the former SmCo5 series. Besides two basic elements Samarium and Cobalt, different grades of Sm2Co17 vary in the content of Iron (Fe), Copper (Cu), and Zirconium (Zr).

Samarium Cobalt Magnet
Manufacturing Process of Sintered SmCo Magnet
  • Introduction of Manufacturing Process

    Sintered Samarium Cobalt magnet is prepared by the raw materials being melted under vacuum or inert gas atmosphere in an induction melting furnace and processed in the strip caster and thus cooled to form alloy strip. The alloys are crushed and pulverized to form a fine powder with an average particle size of 3 microns. The powder is subsequently compacted in an aligning field. Densification and the adjustment of magnetic properties are accomplished via sinter, solution and aging processes. The blanks are then machined to the specific shapes and magnetized.

  • Process Flow of Sintered SmCo Magnet
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Magnetic Properties of Sintered SmCo Magnet
  • Physical properties of SmCo materials

    Physical characteristics

    Density

    Tc

    Bending strength 

    Compressive strength

    Tensile strength

    Fracture toughness

    Modulus of elasticity

    Modulus of rigidity

    Poisson ratio

    HV

    Resistivity

    Thermal conductivity

    specific heat

    Thermal expansion coefficient

    Unit

    g/cm3

    ºC

    MPa

    MPa

    MPa

    MPa•m1/2

    MPa

    MPa

    /

    /

    μΩ•m

    W•(m•ºC)-1

    kJ(kg•ºC) -1

    ∥  

    x10-6 /K

    ⊥  x10-6/K

    SmCo5

    8.1-8.6

    750

    120-180

    1000-1200

    40

    1-2

    100-150

    /

    /

    400-500

    0.5-0.6

    11

    0.37

    6-7

    12-13

    Sm2Co17

    8.2-8.5

    850

    80-160

    800-1200

    35

    1.5-2.5

    150-200

    8x104

    0.2

    500-650

    0.8-0.9

    10

    0.35

    8-10

    10-12
    * Move the blue bar to see more
  • Performance Grades of Sintered SmCo Magnet
    Performance Table of Sintered SmCo Magnet
    View Online
Surface Treatment of Sintered SmCo Magnet
  • Introduction To Surface Treatment of SmCo Magnet

    Samarium-cobalt magnets have good corrosion resistance, they can be used at room temperature or high temperature without coating. If the designed products are used in worse environments, we can provide many kinds of coating.

  • Classification of surface treatment of SmCo Magnet

    Coating

    Thickness(μm)

    Color

    SST(hrs)

    PCT(hrs)

    Characteristics

    BW-Zn

    4-15

    Bright blue

    ≥24

    –

    Secondly commonly used single layer coating. Poor corrosion resistance.

    Color-Zn

    4-15

    Shining color

    ≥48

    –

    Corrosion resistance is better than BW-Zn.

    Ni-Cu-Ni

    5-20

    Bright silver

    ≥48

    ≥48

    Most regular used multi-layer coating. Excellent humidity and salt spray resistance.

    Electroless Ni

    5-20

    Dark silver

    ≥72

    ≥48

    Excellent humidity and salt spray resistance with uniform appearance.

    Ni-Cu-Ni-Au

    5-20

    Golden

    ≥72

    ≥96

    Excellent electrical conductivity and decorative performance.

    Ni-Cu-Ni-Ag

    5-20

    Silver

    ≥72

    ≥96

    Excellent electrical conductivity and decorative performance.

    Ni-Cu-Ni-Sn

    5-20

    Silver

    ≥72

    ≥96

    Excellent humidity resistance.

    Phosphate

    1-3

    Dark grey

    –

    –

    Temporary protection.

    Aluminum

    2-15

    Bright silver

    ≥24

    ≥24

    Noticeable coating.

    Epoxy resin

    10-30

    Black/Grey

    ≥72

    ≥72

    Excellent humidity and salt spray resistance. Superir binding force.

    Parylene

    5-20

    Colorless

    ≥96

    –

    Excellent humidity, salt spray, corrosive vapors, and solvents resistance. Free of pore.

    Everlube

    10-15

    Golden yellow

    ≥120

    ≥72

    Excellent humidity resistance.

    Teflon

    8-15

    Black

    ≥24

    ≥24

    High temperature and rub resistance. Self-lubricant and 100% water-proof.
Shape Categories of Sintered SmCo Magnet
  • Samarium Cobalt Magnet
    Arc
  • Samarium Cobalt Magnet
    Block
  • Samarium Cobalt Magnet
    Cylinder
  • Samarium Cobalt Magnet
    Disc
  • Samarium Cobalt Magnet
    Ring
  • Samarium Cobalt Magnet
    Special-Shaped
Product Categories Of Sintered SmCot Magnet
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Magnetization Direction
  • Samarium Cobalt Magnet

    Magnetization in the thickness direction

  • Samarium Cobalt Magnet

    Axial magnetization

  • Samarium Cobalt Magnet

    Radial magnetization

  • Samarium Cobalt Magnet

    Axial multi-pole magnetization

  • Samarium Cobalt Magnet

    Surface Multipole Magnetization

  • Samarium Cobalt Magnet

    Radial magnetization

About Our Company

Magnetic material core technology research and development team

Hangzhou Zhiyu Magnetic Technology Co., Ltd. is China Rare-earth magnet manufacturers and Radial magnet factory. Hangzhou Zhiyu Magnetic Technology Co., Ltd. is located in Tonglu County, Hangzhou City. It mainly focuses on the research and production of samarium cobalt permanent magnetic materials and magnetic components, and also sells magnetic steel and magnetic components such as neodymium iron boron and aluminum nickel cobalt.
The products are widely used in industries such as national defense and military, aerospace, permanent magnet (high-speed) motors, hydrogen energy compressors, automotive electronics, 5G communication, petrochemical, instrumentation, etc. The variety of samarium cobalt products is complete, with an annual production capacity of over 200 tons;
Fully covering the entire series of samarium cobalt grades of 1:5 and 2:17, covering the entire series of Br0.5T-1.2T;
Stable production of high-performance samarium cobalt magnetic steel with Br ≥ 1.16T and Hcj≥25KOe;
Stable production of Br≥0.96T low-temperature coefficient series products, with residual magnetic temperature coefficient a<-0.01%;
Stable production of ultra-high temperature (temperature resistance ≥ 550 ℃) and high Br (Br ≥ 1.02T) samarium cobalt magnetic steel;
Provide one-stop services from design to product application.

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What is a samarium cobalt magnet?
Samarium cobalt magnet is a kind of rare earth magnet known for its strong magnetism. Samarium-cobalt magnets are composed of alloys of samarium and cobalt and trace amounts of other elements such as iron, copper, and zirconium. They can maintain magnetism for a long time without an external magnetic field and are a type of permanent magnet. Samarium cobalt magnets have high magnetic strength, excellent temperature stability and good resistance to demagnetization. They have a high Curie temperature, the temperature at which a magnet loses its magnetism. Samarium cobalt magnets can typically operate at temperatures up to 350°C (662°F) without significant loss of magnetization. Samarium Cobalt magnets are known for their resistance to corrosion and oxidation, making them suitable for applications in harsh environments. They have a high coercive force, which means they are very difficult to demagnetize, and can generate very strong magnetic fields. These magnets come in a variety of shapes, sizes and grades to suit different applications. Due to their superior magnetic properties, samarium cobalt magnets are widely used in industries such as aerospace, automotive, electronics, medical devices and energy generation. Some common uses include electric motors, sensors, speakers, magnetic couplers, magnetic separators, and scientific research equipment.
What are the properties of samarium cobalt magnets?
Samarium Cobalt (SmCo) magnets are rare earth magnets known for their strong magnetic properties. The following are some key properties of Samarium Cobalt magnets:
High Magnetic Strength: SmCo magnets have a high magnetic energy product, which refers to the maximum magnetic energy that can be stored in a magnet. They have one of the highest field strengths of commercially available magnets and are therefore suitable for applications requiring strong magnetic fields.
Strong temperature stability: Samarium cobalt magnets exhibit excellent stability at high temperatures. They have a high Curie temperature (approximately 700-800 degrees Celsius), which is the temperature at which a magnet loses its magnetism. This makes them ideal for applications involving high temperature environments.
High resistance to demagnetization: Samarium cobalt magnets have excellent resistance to demagnetization, which means they retain their magnetism even when subjected to external magnetic fields or mechanical shocks. They have high coercivity, which is a measure of a magnet's ability to resist demagnetization. This characteristic makes them highly reliable in a variety of industrial applications.
Good Corrosion Resistance: Samarium Cobalt magnets have good corrosion resistance, making them suitable for applications where exposure to moisture or certain harsh environments is expected. However, they are not completely immune to corrosion and a protective coating may be required in some applications.
Low to Medium Conductivity: Samarium Cobalt magnets are generally considered to be weakly or non-conductive, depending on the composition. This feature can be beneficial in certain applications where it is necessary to control the magnetic field without interfering with the circuit.
Due to their unique combination of properties, samarium cobalt magnets have applications in a variety of fields including aerospace, motors and generators, sensors, magnetic couplings, and other high temperature environments where magnets may not be suitable.
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