Samarium Cobalt vs Neodymium
Usually instances, questions come up whether or not it’s higher to make use of Neodymium Iron Boron or Samarium Cobalt in an utility.
Listed here are some comparisons; they’re restricted to the sintered collection, no consideration is given to the bonded collection. The containers with the sunshine blue background point out utility/requirement. The containers with the gentle yellow background point out excellence on this utility/requirement space.
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Neodymium Iron Boron (NdFeB) |
Samarium Cobalt (SmCo) |
| Excessive Temperature Functions | |
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Increased Hci supplies can be utilized as excessive as 200°C, average Hci supplies ought to be used round 150°C. Low Hci supplies ought to be used underneath 100°C |
SmCo can be utilized at considerably increased temperatures than NdFeB. The fabric can take steady temperatures above 250°C |
| Lack of flux density at elevated temperatures (see temperature results on magnets for extra info) | |
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Loses 0.11% of Br/°C. See Temperature results on Br and Hci of NdFeB |
Loses about 0.03% of Br/°C |
| Humid environments | |
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Floor remedy ought to be used. Choices are nickel or polymer coatings equivalent to PR1010, or PM1000. Oxidation generally is a drawback |
Floor remedy shouldn’t be required. Doesn’t oxidize |
| Price of half | |
| Decrease value typically |
Usually increased value than NdFeB |
| Mechanical Energy | |
|
Mechanically very robust, not as brittle as SmCo |
Brittle |
| Clear Room environments | |
|
Floor remedy is advisable |
Floor remedy shouldn’t be required |
|
Vacuum Functions |
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Doesn’t must be coated, nevertheless, if desired, Nickel or IVD is advisable. Polymer coatings equivalent to PR1010 can be utilized, however not advisable in extremely excessive vacuum or excessive temperature functions in vacuum as a result of outgassing. Nickel and IVD are metallic and subsequently don’t outgas |
Floor remedy shouldn’t be required. Nonetheless, the fabric is pretty porous; components could outgas for a restricted period earlier than excessive vacuums may be achieved |
| Aerospace functions | |
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Gaining reputation in aerospace functions. Getting used with and with out floor therapies. Used on aircrafts, missiles, and satellite tv for pc applications very efficiently. Additionally certified and used on the House Station |
Very talked-about in aerospace and protection functions. Has substantial historical past in army, aerospace and protection functions |
| Salt Environments, open seas, and salt spray environments | |
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Care ought to be taken, floor remedy MUST be used, restricted life ought to be anticipated |
Secure on this atmosphere |
| Acid environments | |
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Floor remedy is important, restricted life may be anticipated |
Secure on this atmosphere, nevertheless, qualification checks advisable |
| Alkaline environments | |
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Floor remedy is important, restricted life may be anticipated |
Secure on this atmosphere, nevertheless, qualification checks advisable |
| Skinny walled, skinny cross-section functions (a dimension under 0.040″) | |
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Mechanically steady, components have been made as skinny as 0.008” thick |
Not excellent in very skinny cross-sections. Beneath 0.020” shouldn’t be advisable |
| Single piece massive components | |
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Higher than SmCo, bigger blocks may be sintered |
Bigger blocks (over 3” in any dimension) are difficult |
| Nickel Plating | |
|
Obtainable |
Obtainable |
| PR1010 coating | |
| Obtainable | Obtainable |
| Radial ring configuration (in order to acquire a real radially oriented subject) | |
| Obtainable for customized components. | Not out there |
| Sensitivity of Flux Density, Br, and Coercivity, Hc, to temperature adjustments | |
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The Temperature Coefficient of Br (%/°C) ranges from NEGATIVE (0.11 to 0.13). Increased coercivity supplies (>20 kOe) are nearer to adverse (0.11) The Temperature Coefficient of Hc (%/°C) ranges from NEGATIVE (0.51 to 0.77). The upper the intrinsic coercivity, the decrease the Temperature Coefficient of Hc |
The Temperature Coefficient of Br (%/°C) ranges from NEGATIVE (0.03 to zero.04). Collection Sm2Co17 are much less delicate to temperature adjustments (round adverse 0.03) than SmCo5 (round adverse 0.04) The Temperature Coefficient of Hc (%/°C) ranges from NEGATIVE (0.15 to zero.24). Collection Sm2Co17 are much less delicate to temperature adjustments (round adverse 0.15) than SmCo5 (round adverse 0.24) |
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