TitleProduct

D1/4"X1/8" Disc SmCo Samarium Cobalt Magnet

  • Price:

    Negotiable

  • minimum:

  • Total supply:

  • Delivery term:

    The date of payment from buyers deliver within days

  • seat:

    Fujian

  • Validity to:

    Long-term effective

  • Last update:

    2017-12-29 08:18

  • Browse the number:

    286

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Company Profile

Great Magtech (Xiamen) Electric Co., Ltd.

By certification [File Integrity]

Contact:Mr. Eason Hu(Mr.)  

Email:

Telephone:

Phone:

Area:Fujian

Address:Fujian

Website: http://www.mhjpj.com/com/greatmagtech/

PRODUCT DETAILS

No Matter you buy 1 pcs or 100,000 pcs of magnets, you can not find better service elsewhere.

SmCo Disc Magnet is made from high performance 26M Sm2Co17.
without other protective coating. The dimension of this item is D10x6mm
magnetized Through Thickness. 

 

Size
D1/4"x1/8" 

Shape

Disc / Round / Disk/ Arc......

Material

Samarium Cobalt

Pull force

2.5 pounds

Magnetized

Axial/Radial/Multi-Poles Magnetization

MOQ

5000 pcs

Leading Time

25-35 working days

Sample

Yes

Certificate

ISO2000, TS16949, RoHS, CE, SGS & REACH

Payment

T/T, PayPal, Western Union


Samarium Cobatl magnets: good thermal stability, resistant to corrosion, resistant to demagnetization

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 are generally ranked similarly in strength to neodymium magnets, but have higher temperature ratings and higher coercivity.
samarium-cobalt (SmCo) magnets are brittle, and prone to cracking and chipping. Samarium-cobalt magnets have maximum energy products (BHmax) that range from 16 megagauss-oersteds (MGOe) to 33 MGOe, approx. 128 kJ/m3 to 264 kJ/m3; their theoretical limit is 34 MGOe, about 272 kJ/m3.
samarium-cobalt (SmCo) magnets are available in two "series", namely Series 1:5 and Series 2:17.
Sintered Samarium Cobalt magnets exhibit magnetic anisotropy, meaning they can only be magnetized in the axis of their magnetic orientation. This is done by aligning the crystal structure of the material during the manufacturing process.
 
Machining & Magnetization
Samarium Cobalt magnets offer strong resistance to demagnetization. All Samarium Cobalt magnets cannot be formed with conventional drilling, turning or milling processes, and must be ground before they are magnetized. Additionally, large or complex assemblies are usually magnetized prior to assembly. Standard tolerances for Samarium Cobalt magnets are +/-.005 for ground dimensions.
1:5 alloy material
1:5 offers 16 MGOe (energy product) to 22 MGOe and is made up of approximately 50% samarium and 50% cobalt. The 1:5 series has a maximum recommended operating temperature of 250°C. SmCo 1:5 magnets require lower field strengths than 2:17 materials to magnetize. In some instances, 1:5 material may be magnetized with multiple poles, provided that a magnetizing fixture is available.
2:17 alloy material
2:17 offers 24 MGOe to 32 MGOe and is composed of about 25% samarium, 5% copper, 18% iron, 2% hafnium or zirconium, with the remainder being cobalt. The 2:17 series has a maximum operating temperature of 350°C. Special grades of 2:17 are available which can operate to even higher temperatures. SmCo 2:17 requires a higher magnetizing field than alloy 1:5 does, and multiple pole magnetization is sometimes possible, provided that a magnetizing fixture is available.
Performance for samarium cobalt magnets:
Material Grade Remannence Coercive Force Instrinsic Coercive Max Energy Density Temp
Coefficient
Temp
Coefficient
Cuire Temp Max Working Temp.
(TW)
(Br) (Hcj) (Hcb) (BHmax) (D) (Near Br) (Near Hcj) (TC)
mT Gs KA/m Oe KA/n Oe KJ/m3 MGOe g/cm3 %/K %/K ºC ºC
                             
SmCo 1:5
 
SmCo18 840 8400 605 7600 1432 18000 143 18 8.1 -0.04 -0.3 750 250
(SmPr)CO5 SmCo20 890 8900 637 8000 1432 18000 159 20 8.2 -0.04 -0.3 750 250
  SmCo22 930 9300 637 8000 1432 18000 175 22 8.2 -0.04 -0.3 750 250
  LTc(HM-10) 590 630 493 6200 1430 1830 80 10 8.2 Temp Range %ºC 700 250
1:5                     20-100ºC -0.004    
(SmGd)CO5                     100-200ºC -0.021    
                      200-300ºC -0.042    

 
SmCo24 980 9800 676 8500 1432 18000 191 24 8.3 -0.03 -0.2 800 280
  SmCo24H 980 9800 676 8500 1989 25000 191 24 8.3 -0.03 -0.2 800 280
  SmCo26L 1030 10300 398 5000 438 5500 207 26 8.3 -0.03 -0.2 800 300
  SmCo26 1030 10300 716 9000 1194 15000 207 26 8.3 -0.03 -0.2 800 300
2:17 Sm2 SmCo26M 1030 10300 716 9000 1592 20000 207 26 8.3 -0.03 -0.2 800 300
(CoFeCUZr)17 SmCo26H 1030 10300 716 9000 1989 25000 207 26 8.3 -0.03 -0.2 800 350
  SmCo28 1070 10700 756 9500 1194 15000 223 28 8.3 -0.03 -0.2 800 350
  SmCo28M 1070 10700 756 9500 1592 20000 223 28 8.3 -0.03 -0.2 800 350
  SmCo30 1100 11000 772 9700 1194 15000 239 30 8.3 -0.03 -0.2 800 350
  SmCo30M 1100 11000 772 9700 1592 20000 239 30 8.3 -0.03 -0.2 800 350
  LTc(HMG-22) 980 9800 715 9000 1500 20000 230 23 8.3 Temp Range %ºC 840 300
2:17                     -50-25ºC 0.005    
(SmEr)2(CoTM)17                     20-100ºC 0.012    
                      100-200ºC 0.006    
                      200-300ºC -0.025    
Features include:
Samarium cobalt magnets are hard and brittle and may chip or break if dropped.
They have high magnetic properties
Samarium cobalt magnets offer good thermal stability
Samarium cobalt magnets are resistant to corrosion
Samarium cobalt magnets resistant to demagnetization
 

Advantages:

Extremely resistant to demagnetization
high temperature stability (max operating temperatures between 250 °C (523 K) and 550 °C (823 K); Curie temperatures from 700 °C (973 K) to 800 °C (1,070 K)
Expensive and subject to price fluctuations (cobalt is market price sensitive)
Disadvantages:

Samarium cobalt magnets can easily chip; eye protection must be worn when handling them.
Allowing magnets to snap together can cause the magnets to shatter, which can cause a potential hazard.
Samarium-cobalt is manufactured by a process called sintering, and as with all sintered materials, inherent cracks are very possible. These magnets do not have mechanical integrity; instead the magnet must be utilized for its magnetic functions and other mechanical systems must be designed to provide the mechanical reliability of the system.
Comparison between neodymium and samarium cobalt
Property Neodymium Sm-Co
Remanence (T) 1-1.3 0.82-1.16
Coercivity (MA/m) 0.875-1.99 0.493-1.59
Relative permeability 1.05 1.05
Temperature coefficient of remanence (%/K) 0.12 0.03
Temperature coefficient of coercivity (%/K) 0.55..-0.65 0.15..-0.30
Curie temperature (°C) 320 800
Density (g/cm3) 7.3-7.5 8.2-8.4
CTE, magnetizing direction (1/K) 5.2×106 5.2×106
CTE, normal to magnetizing direction (1/K) 0.8×106 11×106
Flexural strength (N/mm2) 250 150
Compressive strength (N/mm2) 1100 800
Tensile strength (N/mm2) 75 35
Vickers hardness (HV) 550-650 500-650
Electrical resistivity (Ω·cm) (110-170)×106 86×106
 
Manufacturing Methods
SmCo magnets are manufactured in the following forms:
 Sintered - fine SmCo powder is compacted in a die and then sintered, fusing the powder into a solid material. There are two forms of pressing: die pressing (which involves a hard die into which the powder is placed and then pressed), and isostatic pressing (involving a special "rubber" die into which powder is placed and then pressed with equal force in all directions on the powder). Die pressed parts are smaller than isostatically pressed parts. Although the magnetic properties of isostatically pressed parts are higher, the uniformity of magnetic characteristics is usually lower than that of die pressed parts. Sintered parts usually need some finish machining in order to meet final tolerances.

Compression Bonded - this is a technique whereby a special form of SmCo powder is blended with a plastic carrier material, die pressed and then heated. Parts made in this way can be of complex shapes and come off the tool with close tolerances, requiring no further finish machining. They have lower energy products than sintered materials - currently in the range of 15 MGOe.
For more information, please refer to www.greatmagtech.com