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What are Isotropic SmFeN Magnetic Powder and Compounds (Isotropic SmFeN Bonded Magnets)?
Isotropic Sm‑Fe‑N bonded magnets are composed of magnetic powder and a binder.
The magnetic powder has a polycrystalline nanostructure and is produced by a rapid‑quenching method followed by nitriding. Among isotropic bonded magnets, they are characterized by excellent corrosion resistance.
We offer various product forms, including magnetic powders, compounds, compression‑molded magnets, and injection‑molded magnets.
Characteristics of Isotropic SmFeN Magnetic Powder and Compounds (Isotropic SmFeN Bonded Magnets)
-
High corrosion resistance
Highly resistant to corrosion even without coating
-
Long-term thermal stability
Superior to Nd-Fe-B bonded magnets
-
Injection molding
Available with PPS (polyphenylene sulfide) which has excellent heat and chemical resistance
-
Magnetizability
Requires higher magnetic fields than Nd-Fe-B bonded magnets
Isotropic Bonded Magnets by Daido Steel Group (Comparison of property Ranges)
Production process of isotropic SmFeN bonded magnets
Manufacturing and sales of isotropic SmFeN magnet powder, compound (powder with resin), and molded bonded magnets (compression molding and injection molding) by Daido Steel Group.
Bonded Magnets（Daido Electronics）
the website of Daido Electronics
Isotropic SmFeN magnetic powders
| unit | Isotropic SmFeN Magnetic Powder | ||
|---|---|---|---|
| Standard Type SFN2M |
High Coercivity Type SFN3H |
||
| Br | mT (kG) |
930 ～ 990 (9.3 ～ 9.9) |
860 ～ 920 (8.6 ～ 9.2) |
| HcJ | kA/m (kOe) |
614 ～ (7.8 ～ ) |
922 ～ (11.6 ～ ) |
| (BH)max | kJ/m3 (MGOe) |
136 ～ 157 (17.1 ～ 19.7) |
124 ～ 145 (15.6 ～ 18.2) |
※Notes※
- The magnetic properties of the powder are measured in the unmilled condition.
- Magnetic properties are measured after magnetization at 5 T.
- The data in this table are obtained from Daido's standard test pieces and do not represent guaranteed values.
- These values may vary depending on the magnet shape, dimensions, test conditions, and equipment. We recommend verifying the values using actual products.
- Guaranteed values can be established through consultation for specific shapes and sizes.
- The data are subject to change without notice.
Demagnetization Curves of Magnetic Powder（23℃）
Isotropic SmFeN compounds for compression molding
Compression molded isotropic SmFeN bonded magnets
Magnetic, physical, and mechanical properties
To meet the increasing demand for high heat resistance, we have newly introduced a high-coercivity type.
We will continue to expand our lineup to meet customers’ needs.
| unit | Isotropic SmFeN Magnet | ||
|---|---|---|---|
| Standard Type SP-13C(Compound) SP-13(Magnet) |
High Coercivity Type SP-11RC(Compound) SP-11R(Magnet) |
||
| Magnetic Powder Grade |
- | SFN2M | SFN3H |
| Br | mT (kG) |
750 ～ 830 (7.5 ～ 8.3) |
670 ～ 750 (6.7 ～ 7.5) |
| HcB | kA/m (kOe) |
450 ～ (5.7 ～ ) |
460 ～ (5.8 ～ ) |
| HcJ | kA/m (kOe) |
614 ～ (7.8 ～ ) |
922 ～ (11.6 ～ ) |
| (BH)max | kJ/m3 (MGOe) |
94 ～ 107 (11.9 ～ 13.4) |
82 ～ 95 (10.4 ～ 11.9) |
| μrec | - | 1.15 ～ 1.20 | 1.10 ～ 1.15 |
| α (23 ～ 120 ℃) |
%/℃ | -0.07 | -0.06 |
| β (23 ～ 120 ℃) |
%/℃ | -0.39 | -0.39 |
| Density | g/cm3 | 6.14 | 6.09 |
| Thermal Expansion Coefficient (20 ～ 100℃) |
10-5/℃ | 1.3 | 1.3 |
| Flexural Strength |
MPa (kgf/mm2) |
52 (5.3) |
52 (5.3) |
| Bending Elastic Modulus | MPa (kgf/mm2) |
10,800 (1,102) |
10,800 (1,102) |
| Ring Crushing Strength | MPa (kgf/mm2) |
54 (5.6) |
54 (5.6) |
※Notes※
- Magnetic properties are measured after magnetization at 5 T.
- The data in this table are obtained from Daido's standard test pieces and do not represent guaranteed values.
- These values may vary depending on the magnet shape, dimensions, test conditions, and equipment. We recommend verifying the values using actual products.
- Guaranteed values can be established through consultation for specific shapes and sizes.
- The data are subject to change without notice.
Demagnetization Curves of Compression-Molded Bonded Magnets at Elevated Temperatures
(23 ～ 150 ℃)
Corrosion resistance: Long-Term Corrosion Resistance (Uncoated)
Corrosion resistance: Long-Term Thermal Resistance (Uncoated)
Isotropic SmFeN Magnets: Injection Molding Compound and Bonded Magnets (PPS Grade)
Magnetic, physical, and mechanical properties
| unit | Isotropic SmFeN Magnet | ||||
|---|---|---|---|---|---|
| Standard Type SC-6LR(Compound) SPI-6LR(Magnet) |
Standard Type SC-7LR(Compound) SPI-7LR(Magnet) |
High Coercivity Type SC-6SR(Compound) SPI-6SR(Magnet) |
High Coercivity Type SC-7SR(Compound) SPI-7SR(Magnet) |
||
| Magnetic Powder Grade |
- | SFN2M | SFN2M | SFN3H | SFN3H |
| Resin | - | PPS | PPS | PPS | PPS |
| Br | mT (kG) |
480 ～ 560 (4.8 ～ 5.6) |
540 ～ 620 (5.4 ～ 6.2) |
430 ～ 510 (4.3 ～ 5.1) |
470 ～ 550 (4.7 ～ 5.5) |
| HcB | kA/m (kOe) |
302 ～ (3.8 ～ ) |
335 ～ (4.3 ～ ) |
287 ～ (3.7 ～ ) |
318 ～ (4.0 ～ ) |
| HcJ | kA/m (kOe) |
572 ～ (7.2 ～ ) |
572 ～ (7.2 ～ ) |
851 ～ (10.7 ～ ) |
851 ～ (10.7 ～ ) |
| (BH)max | kJ/m3 (MGOe) |
38 ～ 50 (4.8 ～ 6.2) |
49 ～ 60 (6.2 ～ 7.5) |
31 ～ 39 (3.9 ～ 4.9) |
39 ～ 49 (5.0 ～ 6.1) |
| μrec | - | 1.10 ～ 1.20 | 1.10 ～ 1.20 | 1.10 ～ 1.20 | 1.10 ～ 1.20 |
| α (23 ～ 120℃) |
% /℃ | -0.07 | -0.08 | -0.06 | -0.06 |
| β (23 ～ 120℃) |
% /℃ | -0.42 | -0.43 | -0.41 | -0.41 |
| Density | g/cm3 | 4.76 | 5.07 | 4.77 | 5.07 |
| Thermal Expansion Coefficient (20 ～ 100℃) |
10-6/℃ | MD : 1.7 TD : 2.1 |
MD : 1.6 TD : 2.0 |
MD : 1.7 TD : 2.1 |
MD : 1.5 TD : 2.0 |
| Flexural Strength | MPa (kgf/mm2) |
60 (6.2) |
47 (4.8) |
54 (5.6) |
40 (4.1) |
| Bending Elastic Modulus | MPa (kgf/mm2) |
24,800 (2,529) |
26,900 (2,744) |
24,200 (2,468) |
26,100 (2,662) |
| Ring Crushing Strength | MPa (kgf/mm2) |
84 (8.6) |
60 (6.2) |
77 (7.9) |
53 (5.4) |
※Notes※
- Magnetic properties are measured after magnetization at 5 T.
- The data in this table are obtained from Daido's standard test pieces and do not represent guaranteed values.
- These values may vary depending on the magnet shape, dimensions, test conditions, and equipment. We recommend verifying the values using actual products.
- Guaranteed values can be established through consultation for specific shapes and sizes.
- The data are subject to change without notice.
Demagnetization Curves of Injection-Molded Bonded Magnets at Elevated Temperatures
(23 ～ 150 ℃)
Isotropic SmFeN Magnets: Injection Molding Compound and Bonded Magnets (PA Grade)
| unit | Isotropic SmFeN Magnet | ||||
|---|---|---|---|---|---|
| Standard Type SC-8L(Compound) SPI-8L(Magnet) |
Standard Type SC-9L(Compound) SPI-9L(Magnet) |
High Coercivity Type SC-8S(Compound) SPI-8S(Magnet) |
High Coercivity Type SC-9S(Compound) SPI-9S(Magnet) |
||
| Magnetic Powder Grade |
- | SFN2M | SFN2M | SFN3H | SFN3H |
| Resin | - | PA12 | PA12 | PA12 | PA12 |
| Br | mT (kG) |
600 ～ 680 (6.0 ～ 6.8) |
630 ～ 710 (6.3 ～ 7.1) |
550 ～ 630 (5.5 ～ 6.3) |
570 ～ 650 (5.7 ～ 6.5) |
| HcB | kA/m (kOe) |
381 ～ (4.8 ～ ) |
397 ～ (5.0 ～ ) |
374 ～ (4.7 ～ ) |
382 ～ (4.9 ～ ) |
| HcJ | kA/m (kOe) |
572 ～ (7.2 ～ ) |
572 ～ (7.2 ～ ) |
851 ～ (10.7 ～ ) |
851 ～ (10.7 ～ ) |
| (BH)max | kJ/m3 (MGOe) |
61 ～ 73 (7.7 ～ 9.1) |
67 ～ 79 (8.5 ～ 9.9) |
55 ～ 67 (7.0 ～ 8.4) |
57 ～ 69 (7.2 ～ 8.6) |
| μrec | - | 1.10 ～ 1.20 | 1.10 ～ 1.20 | 1.10 ～ 1.20 | 1.10 ～ 1.20 |
| α (23 ～ 120℃) |
% /℃ | -0.07 | -0.07 | -0.05 | -0.06 |
| β (23 ～ 120℃) |
% /℃ | -0.42 | -0.42 | -0.41 | -0.42 |
| Density | g/cm3 | 5.27 | 5.41 | 5.27 | 5.41 |
| Thermal Expansion Coefficient (20 ～ 100℃) |
10-6/℃ | MD : 2.9 TD : 3.6 |
MD : 2.4 TD : 3.2 |
MD : 2.7 TD : 3.7 |
MD : 2.3 TD : 3.3 |
| Flexural Strength | MPa (kgf/mm2) |
59 (6.0) |
56 (5.8) |
68 (7.0) |
74 (7.6) |
| Bending Elastic Modulus | MPa (kgf/mm2) |
19,000 (1,938) |
20,400 (2,081) |
20,400 (2,081) |
23,700 (2,417) |
| Ring Crushing Strength | MPa (kgf/mm2) |
63 (6.5) |
56 (5.8) |
65 (6.7) |
61 (6.3) |
※Notes※
- Magnetic properties are measured after magnetization at 5 T.
- The data in this table are obtained from Daido's standard test pieces and do not represent guaranteed values.
- These values may vary depending on the magnet shape, dimensions, test conditions, and equipment. We recommend verifying the values using actual products.
- Guaranteed values can be established through consultation for specific shapes and sizes.
- The data are subject to change without notice.
Demagnetization Curves of Injection-Molded Bonded Magnets at Elevated Temperatures
(23 ～ 120 ℃)
