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General
Description: SmCo Magnets
As part of the rare earth group of permanent magnets, samarium cobalt (SmCo) magnets typically fall into two families of materials. They include rare earth Sm1Co5 and Sm2Co17 and are referred to as 1:5 and 2:17 materials. There’re three different manufacturing processes: sintered SmCo magnets, bonded SmCo magnet, and injection moulding SmCo magnets. SmCo magnet is high performance, low temperature coefficient permanent made of samarium and cobalt and other rare-earth elements. Its biggest advantage is high working temperature-300 degree centigrade. It needn’t to be coated because it is difficult to be eroded and oxidized. SmCo magnet is widely used in motor, watch, transducers, instruments, positional detector, generator, radar, etc. Key features for sintered SmCo Key features for bonded SmCo Key features for injection moulding SmCo Comparison of NdFeB and SmCo Magnets
Application: Shape: All kinds of permanent materials such as squares, rounds, rings, tiles, bars, polygons can be supplied according to customer’s requirements. Delivery after magnetization in accordance with blue prints.
Sintered SmCo magnetSamarium
Cobalt holds its standard property in higher maximum temperatures
than neodymium,although its maximum strengh is less. The cost of SmCo
material is the most expensive,so SmCo is recommended only when its
performance is a high temperature environment is a concern.
The characteristics of Samarium Cobalt Magnet *Very high magnetic properties with good stability. *Superior resistance to high temperature,Curie temperature of majority is over 800?? *Excellent corrosion resistance capability,no coating is needed for surface protection. Typical Magnetic Porperties of Samarium Cobalt Materials Properties of SmCo Permanent Magnet
Characteristics & application of SmCo permanent magnet  Typical Characteristic Curve for SmCo permanent magnet 1.SmCo permanent magnet has high magnetic energy product andhigh cercive force. Its properties are better than Alnico,ferrite permanent magnet. Its max. energy product is up to 239kJ/m3(30MGOe), which is three times of that of Alnico8 permanent magnet, eight times of that of ferrite permanent magnet (Y40). So the permanent magnetic component made from SmCo material is small, light and stable in property. It is widely applied to electro acoustic& telecommunication apparatus, electric motors, measure meters, peg-top,electronic watch,microwave apparatus, magnetic mechanism, sensor and other static or dynamic magnetic routes. 2.The curie temp. of the SmCopermanent magnet is high and its temp. Coeff.is low. So it is suitable for use at 300, high temp. 3.SmCo permanent magnet is hear and bristle. Its rigidity strength, tensile strength and press strength are low. So it is not suitable for framework. 4.The main ingredient
of SmCo permanent magnet is metal cobalt(Co Reference points for application design of permanent magnet 1.What we stated herein are typical grades of SmCo permanent magnet only. We could meet your requirements for various magnetic properties too. 2.For application of
permanent magnet at high temp., you need consider the following
two important parameters: recoil temp. coeff( 3.The appropriate dimensions
of he permanent magnet should be taken into account for the application
design. Generally speaking, the demagnetization curve of SmCo permanent
magnet is close to a straight line and the difference value between
Residual Flux Density Br & coercive force Hcb is relatively
small. So we should choose the working point (Pc value) around the
Max. energy product, i.e. (BH)max. Thus we could utilize the magnetic
energy fully and save the cost greatly. Design reference: 0.5 4.SmCo permanent magnet is a functional material. It is unsuitable for structure part design. So the usual requirement to the tolerance of the dimensions for structure part is not applicable to it. For the detailed tolerance design, please refer to "permanent magnet supply illustration". 5.SmCo permanent magnet has strong anticorruption function. So it needn't similar surface treatment as that of NdFeB magnet. For the surface protect of SmCo permanent magnet, please turn to "surface protect and protect coating of permanent magnet". The coating will add to the cost in turn. Bonded SmCo Magnet:
Our bonded SmCo is made with ground sintered SmCo magnet. The powder is mixed with resin and molded like NdFeB bonded magnet. Various shapes of high dimensional accuracy can be produced without further processing. Due to excellent corrosion resistance, coating is not required. Compression bonded magnets are available using many isotropic neodymium iron boron material grades as well as crushed & powdered samarium cobalt materials. Combinations of different material grades may also be used to create specific magnetic characteristics. Compression bonded magnets offers higher magnetic strength than injection molded magnets due to their higher magnetic particle density, but are limited to simpler geometries. The epoxy binder used is resistant to normal industrial solvent and automotive fluids. To reduce corrosion of the rare earth magnetic materials, they are further coated with epoxy after shaping. The normal application temperatures range from below -40°C to above 165°C. Compression bonding is most appropriate for
relatively simple geometries due to limitations of the compaction
process. The tooling costs for compression bonding is comparatively
low, making it a better choice than injection molding where volumes
are small. However, with modest automation, compression bonding can
also be adopted for high volume manufacturing, with volumes upto millions
of pieces per year.
Injection bonded SmCo magnet
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and intrinsic coercive force(Hcj). Recoil temp. coeff. is a parameter
to measure the performance of the permanent magnet with the variation
of the temp. When the temp come back to the initial value, the magnetic
properties of the permanent magnet will reversibly return to the
initial condition too. More smaller the temperature coefficient
is, more lower the magnetic properties are. In the meantime, with
the variation of the temperature, the magnetic properties of permanent
magnet can change irreversibly. This is called irreversible loss.
The irreversible loss descends with the increase of the intrinsic
coercive force. 
Pc
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