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MAGNETIC CHARACTERISTIC
FERRITE
| Item | Unit | Isotropic | Anisotropic by Dry | Anisotropic by Wet |
|---|---|---|---|---|
| Compositon | — | BaO•6Fe2O3 | SrO•;6Fe2O3 | SrO•6Fe2O3 |
| Molding Process | — | Dry Powder | Dry Powder in Magnetic Field |
Wet Powder in Magnetic Field |
| Residual Flux Density Br |
mT | ≥200 | 310 to 360 | 380 to 400 |
| kG | ≥2.0 | 3.1 to 3.6 | 3.8 to 4.0 | |
| Coercive Force bHc |
kA/m | 127 to 159 | 220 to 250 | 222 to 238 |
| KOe | 1.6 to 2.0 | 2.8 to 3.2 | 2.8 to 3.0 | |
| Intrinsic Coercive Force iHc |
kA/m | 135 to 167 | 280 to 320 | 230 to 246 |
| KOe | 1.7 to 2.1 | 3.5 to 4.0 | 2.9 to 3.1 | |
| Maximum Energy Product (BH) max |
kJ/m2 | 6.3 to 9.5 | 20 to 24 | 27 to 30 |
| MGOe | 0.8 to 1.2 | 2.5 to 3.0 | 3.4 to 3.8 | |
| Temperature Coefficent Br | %/K | -0.18 | -0.18 | -0.18 |
| Temperature Coefficent iHc | %/K | 0.22 | 0.27 to 0.42 | 0.27 to 0.42 |
| Curie Point Tc |
K | 723 | 733 | 733 |
| °C | 450 | 460 | 460 | |
| Recoil Relative Magnetic
Permeability μrec |
— | 1.1 to 1.2 | 1.1 to 1.2 | 1.05 to 1.1 |
| Density | g/cm2 | 4.8 | 4.9 | 4.9 |
| Deflecting Strength | Mpa | 29 to 68 | 49 to 88 | 49 to 88 |
| Kgf/mm2 | 3 to 7 | 5 to 9 | 5 to 9 | |
| Compression Strength | MPa | >686 | >686 | >686 |
| Kgf/mm2 | >70 | >70 | >70 | |
| Tensile Strength | MPa | 19 to 49 | 19 to 49 | 19 to 49 |
| Kgf/mm2 | 2 to 5 | 2 to 5 | 2 to 5 | |
| Specific Heat | J/ (Kg•K) | 0.84x103 | 0.84x103 | 0.84x103 |
| cal/g•°C | 0.2 | 0.2 | 0.2 | |
| Vickers Hardness | HV | 530 | 530 | 530 |
| Thermal Expansion Coefficient Lateral |
ppm/K | 9.9 | 11 | 13 |
| Thermal Expansion Coefficient Vertical |
ppm/K | 9.9 | 9 | 8 |
| JIS | — | MPB-8/15D | MPS-24/24D | MPS-31/24W |
| MMPA | — | CERAMIC-1 | CERAMIC-6 | CERAMIC-8 |
| Magnetic Field To Be Charged
For Magnetization |
kA/m | 800 | 800 | 800 |
| KOe | 10 | 10 | 10 | |
| Electric Resistance | nΩ•m | >102 | >102 | >102 |