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Characteristics of Isotropic SmFeN bonded magnets
- Highest (BH)max among isotropic bonded magnets: ~112kJ/m3 (compression molded magnet)
- High corrosion resistance: Does not require coating in typical usage environment
- High thermal stability:
Temperature coefficient of Br, α -0.06 ～ -0.07% /℃ (23 ～ 120℃) - 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 → Can be magnetized in any direction, realize flux paths with high permeance.
- Lower supply risk of raw materials (HREE-free, use of surplus rare earth – Sm)
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.
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-14C(Compound) SP-14(Magnet) |
High Coercivity Type SP-12RC(Compound) SP-12R(Magnet) |
||
| Magnetic Powder Grade |
- | SFN2M | SFN3H |
| Br | mT (kG) |
750 ～ 820 (7.5 ～ 8.2) |
710 ～ 770 (7.1 ～ 7.7) |
| HcB | kA/m (kOe) |
450 ～ (5.7 ～ ) |
470 ～ (6.0 ～ ) |
| HcJ | kA/m (kOe) |
670 ～ (8.5 ～ ) |
980 ～ (12.4 ～ ) |
| (BH)max | kJ/m3 (MGOe) |
98 ～ 112 (12.4 ～ 14.0) |
86 ～ 99 (10.9 ～ 12.4) |
| μrec | - | 1.15 ～ 1.20 | 1.10 ～ 1.15 |
| α (23 ～ 120 ℃) |
%/℃ | -0.07 | -0.06 |
| β (23 ～ 120 ℃) |
%/℃ | -0.39 | -0.39 |
| ρ | g/cm3 | 5.8 ～ 6.4 | 5.8 ～ 6.4 |
| Thermal Expansion Coefficient (20 ～ 100℃) |
10-6/℃ | 12.6 | 12.6 |
| 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 compounds for injection molding
Injection molded isotropic SmFeN bonded magnets
Magnetic, physical, and mechanical properties
We plan to introduce new grades using PA resin in the future.
| 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) |
||
| Magnetic Powder Grade |
- | SFN2M | SFN2M | SFN3H |
| Br | mT (kG) |
480 ～ 560 (4.8 ～ 5.6) |
540 ～ 620 (5.4 ～ 6.2) |
430 ～ 510 (4.3 ～ 5.1) |
| HcB | kA/m (kOe) |
302 ～ (3.8 ～ ) |
335 ～ (4.3 ～ ) |
287 ～ (3.7 ～ ) |
| HcJ | kA/m (kOe) |
620 ～ (7.8 ～ ) |
620 ～ (7.8 ～ ) |
915 ～ (11.5 ～ ) |
| (BH)max | kJ/m3 (MGOe) |
38 ～ 50 (4.8 ～ 6.2) |
49 ～ 60 (6.2 ～ 7.5) |
31 ～ 39 (3.9 ～ 4.9) |
| μrec | - | 1.10 ～ 1.20 | 1.10 ～ 1.20 | 1.10 ～ 1.20 |
| α (23 ～ 120℃) |
% /℃ | -0.07 | -0.08 | -0.06 |
| β (23 ～ 120℃) |
% /℃ | -0.42 | -0.43 | -0.41 |
| ρ | g/cm3 | 4.6 ～ 5.1 | 5.0 ～ 5.5 | 4.6 ～ 5.1 |
| Thermal Expansion Coefficient (20 ～ 100℃) |
10-6/℃ | MD : 16 TD : 20 |
MD : 16 TD : 20 |
MD : 16 TD : 20 |
| Flexural Strength | MPa (kgf/mm2) |
60 (6.2) |
47 (4.8) |
54 (5.6) |
| Bending Elastic Modulus | MPa (kgf/mm2) |
24,800 (2,529) |
26,900 (2,744) |
24,200 (2,468) |
| Ring Crushing Strength | MPa (kgf/mm2) |
84 (8.6) |
60 (6.2) |
77 (7.9) |
| Hardness | HRM | 96 | 95 | 93 |
| Tensile Strength | MPa (kgf/mm2) |
38 (3.9) |
31 (3.2) |
35 (3.6) |
| Tensile Elastic Modulus | MPa (kgf/mm2) |
22,000 (2,244) |
24,000 (2,448) |
24,000 (2,448) |
※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 ℃)
