Comparison and Substitutability of Samarium Cobalt Magnet and Neodymium Magnet

Elementary Composition

Neodymium magnet:


Iron 64%-68.5%

Boron about 1%


SmCo Magnet


Cobalt 48%-52%

Iron 14%-17%

Copper 5%-7%

Zirconium 2%-3%

Magnetic Performance

The magnetic performance of SmCo magnet is generally lower than that of Neodymium. The magnetic performance of a magnet is measured by its magnetic energy-(BH)max. The (BH)max of Sm2Co17 is about 28-33 MGOe, at the same time, the (BH)max of neodymium is around 33-52  MGOe.

Temperature Resistance

The working temperature of Neodymium magnet is between 80℃ to 200 ℃, of course, the higher the working temperature is, the higher the price is. The working temperature of Sm2Co17 magnet is from 300℃ to 350 ℃. Beside, SmCo magnet is less influenced by the rise of temperature.

The Corrosion Resistance

Neodymium magnet must be electroplated, otherwise it is easy to be oxidized corrosion. Samarium cobalt usually does not require surface treatment, it performances highly resistance to corrosion.

Price of Neodymium Magnet and SmCo Magnet

In neodymium magnet, the high value element (neodymium) is about 30%, on the other side, the high value elements(Samarium,Cobalt) account about 75% in SmCo Magnet. So SmCo Magnets were more expensive than neodymium magnets in the past 20 years. With the rise of neodymium raw material cost, SmCo has become a relatively economical option in some areas.

Substitutability of two Materials

Some special work environments like high temperature motor,require magnets with great temperature resistance, in these cases, SmCo is the alternative of neodymium magnets. In our practice, neodymium magnet grade like 33UH, 33EH, 33AH even 35UH, 35EH, 35AH could be taking place by SmCo magnets.

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