Description:

SmCo magnet is a high performance low temperature coefficient permanent magnet made of samarium and cobalt and other rare earth elements. Sm-Co magnets can be operated at higher temperature up to 300 C. Sm-Co materials come in energy products from 16 MGOe up to 33 MGOe. Their high resistance to demagnetizing influences and excellent thermal stability has ensured Sm-Co as the premium choice for the most demanding motor applications.

Advantage 

• Excellent thermal stability
• High magnetic properties
• Good corrosion resistance
• High resistance to demagnetization

Disadvantage

• Difficult to machine
• Expensive material (cobalt is market price sensitive)

Manufacturing process

Both the types of SmCo magnets are manufacture by powder metallurgy. The raw materials are melted in a furnace and cast into thin sheet or ingot. The material is crushed and then pulverized by ball milling or by jet milling. The powder is then oriented with external magnetic field and pressed into blocks or near net shape. Final properties and density are achivied in following sintering and heat treatments. The blocks are then cut to shape and magnetized.

SmCo 1:5

As the nomination indicates, the samarium-cobalt 1:5 magnet alloys (generally written as SmCo5, or SmCo 1:5) have one atom of rare earth samarium per five atoms of cobalt. By weight this magnet alloy will typically contain 36% samarium with the balance cobalt. Sometimes Prasedymium is alloyed to increase the remanence. The energy products of these samarium-cobalt alloys range from 16 MGOe to 25 MGOe, that is, approx. 128 – 200 kJ/m3. Contrary to SmCo 2:17 magnets, the 1:5 magnets are relatively easy to magnetize and saturation magnetization can be achieved with a moderate magnetizing field. Therefore, 1:5 magnets are easier to calibrate to a specific magnetic field than the SmCo 2:17 magnets.

SmCo 2:17

These alloys (written as Sm2Co17, or SmCo Series 2:17) are age-hardened with a composition of two atoms of rare-earth samarium per 13-17 atoms of transition metals (TM). The TM content is rich in cobalt, but contains also other metals such as iron and copper. Other elements like Zirkonium and Hafnium etc. may be added in small quantities to achieve better heat treatment response. The maximum energy products of these alloys range from 20 to 32 MGOe, what is about 160-260 kJ/m3. These alloys have the best reversible temperature coefficient of remanence of all rare-earth alloys, typically being -0.03%/°C.

In Sm2Co17 magnets, the coercivity mechanism is based on domain wall pinning (in contrary to SmCo 1:5 and NdFeB where it’s nucleation). The purpose of alloying and heat treatment is to create a microstructure inside the magnets which impede the domain wall motion and thereby resist the magnetization reversal process.

Packing of sintered smco magnets:

1. Sea shipment : strong cartons and then packed in strong wooden cases.

2. Air shipment: well shielded cartons for magnetism inspection.

Our Shipping ways:

1. Express courier, TNT, Fedex, DHL,UPS for your choice.

*Ship door to door. You can provide your express account for the freight payable at destination.

*Delivery time: 3-7 days

2. Air cargo , shipping to your nearest airport.

*If you choose this way, please provide us your nearest airport and zip code.

*Delivery 5-15days.

*Suitable for cargo over 45 kg

3. Sea cargo, shipping to your nearest port.

*If you choose this way, please provide us your nearest port and zip code.

*Delivery approximately 30 days.

*This type of shipping is suitable for cargo over 200KGS, or have big volume.

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