neodymium(NdFeB) magnets, samarium cobalt(SmCo5, Sm2Co17)magnets, Alnico magnets, permanent rare earth magnets.
NCMag™ supplier of super powerful rare earth(SmCo,NdFeB) magnets; manufacturer of strongest magnets neodymium N52,N50, N45 in china.

what's rare earth magnet? where's SmCo, neodymium magnets manufacturer? how to buy rare earth (NdFeB or samarium cobalt) magnets?

Rare earth magnets have higher remanence, much higher coercivity and energy product, but lower Curie temperature than other types.

There are two types: neodymium magnets and samarium-cobalt magnets. Rare earth magnets are extremely brittle and also vulnerable to corrosion, so they are usually plated or coated to protect them from breaking and chipping.

NdFeB is called a rare earth magnet because the neodymium is a rare earth element, having a value of 60 on the Periodic Table. for note, there is nothing rare about rare earth magnets – the required elements are readily available and the NdFeB magnets are produced in several hundreds of tonnes each year. Neodymium magnets are a type of rare earth magnet. They are the strongest rare earth magnets. They are often referred to as rare earth magnets because they belong to the rare earth elements. But they are not the same as rare earth magnets. There are different types of rare earth magnets and Neodymium magnets are just one type. Neodymium magnets are the strongest permanent magnets available today.

The advantage of the rare earths and their compounds over other magnets is that their crystalline structures have very high magnetic anisotropy. This means that a crystal of the material is easy to magnetize in one particular direction, but resists being magnetized in any other direction.

rare earth magnets: NdFeB Vs samarium cobalt(SmCo)

neodymium magnets Vs SmCo magnets
parameters neodymium iron boron (NdFeB) magnets samarium cobalt (SmCo) magnets
High Temperature Applications Higher Hci materials can be used as high as 200°C, moderate Hci materials should be used around 150°C. Low Hci materials should be used under 100°C SmCo can be used at substantially higher temperatures than NdFeB. The material can take continuous temperatures above 250°C
Loss of flux density at elevatedtemperatures temperature effects Loses 0.11% of Br/°C. Loses about 0.03% of Br/°C
Humid environments Surface treatment should be used. Options are nickel, IVD or polymer coatings such as PR1010, PR1020, or M1000. Oxidation can be a problem Surface treatment is not required. Does not oxidize
Hydrogen rich atmosphere Not recommended, occurs, causing the magnet material to disintegrate No known adverse effects
Cost of part Lower cost generally Typically higher cost than NdFeB
Radiation environment Can be damaged by radiation, mainly gamma rays S2471 and higher grades are very stable in radiation environments
Mechanical Strength Mechanically very strong, not as brittle as SmCo Brittle
Clean Room environments Surface treatment is recommended Surface treatment is not required
Vacuum Applications Does not need to be coated, however, if desired, Nickel or IVD is recommended. Polymer coatings such as PR1010 can be used, but not recommended in ultra high vacuum or high temperature applications in vacuum due to outgassing. Nickel and IVD are metallic and therefore do not outgas Surface treatment is not required. However, the material is fairly porous; parts may outgas for a limited duration before high vacuums can be achieved
High field requirements Can achieve much higher fields, higher energy products achievable 55 MGOe available Highest energy product materials are S3264 and S3069, generally very difficult to obtain higher than 30 MGOe.
Cryogenic temperatures Only special formulation grades can be used (call for more information on this) Works well in cryogenic temperatures.
Aerospace applications Gaining popularity in aerospace applications. Being used with and without surface treatments. Used on aircrafts, missiles, and satellite programs very successfully. Also qualified and used on the Space Station Very popular in aerospace and defense applications. Has substantial history in military, aerospace and defense applications
Salt Environments, open seas, and salt spray environments Care should be taken, surface treatment MUST be used, limited life should be expected Stable in this environment
Acid environments Surface treatment is necessary, limited life can be expected Stable in this environment, however, qualification tests recommended
Alkaline environments NeSurface treatment is necessary, limited life can be expected Stable in this environment, however, qualification tests recommended
Thin walled, thin cross-section applications Mechanically stable, parts have been made as thin as 0.008” thick Not very good in very thin cross-sections. Under 0.020” is not recommended
Single piece large parts Better than SmCo, larger blocks can be sintered Larger blocks is challenging
Nickel Plating per military specifications Not available – Plating is done to proprietary specifications, only Electrolytic Nickel is available Electroless and electrolytic nickel plating is available. Mil-C-26074 can be complied to
Plating per military specifications Not available. All platings are done per proprietary specifications. Not typically used. Call factory for more information
PR1010 coating Available AvailableTR
Radial ring configuration Available for custom parts. Not available
Sensitivity of Flux Density, Br, and Coercivity, Hc, to temperature changes The Temperature Coefficient of Br ranges from negative . Higher coercivity materials are closer to negative.The Temperature Coefficient of Hc ranges from negative. The higher the intrinsic coercivity, the lower the Temperature Coefficient of Hc The Temperature Coefficient of Br ranges from negative . Series Sm2Co17 are less sensitive to temperature changes than SmCo5 .The temperature Coefficient of Hc ranges from NEGATIVE (0.15 to 0.24). Series Sm2Co17 are less sensitive to temperature changes than SmCo5.
Total 22 neodymium magnets and samarium cobalt(SmCo)magnets
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