SmCo Block Magnet for various electric motors

A samarium-cobalt (SmCo) magnet, a type of rare earth magnet, is a strong permanent magnet made of an alloy of samarium and cobalt. They were developed in the early 1960s based on work done by Dr. Karl Strnat and Dr. Alden Rey at Wright-Patterson AFB and the University of Dayton, respectively.

SmCo is argueably the best permanent magnet material commercially available, with remanence similar to neodymium magnets, but with higher temperature ratings and with superior temperature stability. There are two types of SmCo magnets, SmCo 1:5 and SmCo 2:17.

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.

Magnetic properties of SmCo :
Packing of our products:
 
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.

Our advantage:

 1,With more than 10 years experiece of magnets area

 2,Experienced Staff
 
3,Sophisticated equipment

 4,Competitive price:People have asked us how we can offer such high quality at such good prices and the answer is simple: we
design and build our own products and can pass that savings on to you. There is     no middleman.

 5,OEM are welcomed,samples is available,small orders accepted

 6,100% Quality &  Best Service Guarantee:Competitive pricing doesn't mean we skimp on service. Our fully staffed office of experienced professionals strives to return your quote on the same business day.

 7,Quick delivery time:It is about 7~15 days.

 8,Payment:We can accept T/T,Westernion Union,Paypal
 

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