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Ferrite magnets
MAGNETIC PROPERTIES
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Ferrite magnets
Ferrite magnets, otherwise referred as ceramic magnets or hard ferrite, are developed in 1930. In addition to superior cost advantage and corrosion resistance, ferrite magnets are medium in magnetic properties and can be applied under relatively high temperature conditions. As nonmetallic type of permanent magnetic material, ferrite magnets are utilizing iron oxide (Fe2O3),Barium Carbonate (BaCO3) or Strontium Carbonate (SrCO3)as raw material, therefore, ferrite magnets can be classified to Strontium ferrite magnets and Barium ferrite magnets according to the composition.Strontium ferrite magnets and Barium ferrite magnets are also known as anisotropic ferrite magnets and isotropic ferrite magnets, respectively.
Sintered Ferrite Magnets
Maximum operating temperature of sintered ferrite magnets can arrive 250 degrees Celsius. Sintered ferrite magnets also have superior corrosion resistance. Sintered ferrite magnets are generally used in various areas in the past several decades and their market share are still very large even the application range of sintered Neodymium magnets is more and more extensive. The most representative applications of sintered ferrite magnets include loudspeakers, permanent magnet (PM) motors and generators.
1.Typical magnetic properties of sintered ferrite magnets
Magnetic properties of different manufacturers vary slightly. Following data are only for reference when designing and selecting materials.
| Standard | Grade |
Residual magnetic flux density Br |
Coercive force HcB |
Intrinsic coercive force HcJ |
Maximum energy product (BH)max |
||||
|---|---|---|---|---|---|---|---|---|---|
| mT | kGs | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | ||
|
(SJ285-77) Chinese Standard |
Y8T | 200-235 | 2.0-2.35 | 125-160 | 1.57-2.01 | 210-280 | 2.64-3.52 | 6.5-9.5 | 0.8-1.2 |
| Y10T | 200-235 | 2.0-2.35 | 128-160 | 1.61-2.01 | 210-280 | 2.64-3.52 | 6.4-9.6 | 0.8-1.2 | |
| Y20 | 320-380 | 3.2-3.8 | 135-190 | 1.70-2.39 | 140-195 | 1.76-2.45 | 18.0-22.0 | 2.3-2.8 | |
| Y22H | 310-360 | 3.1-3.6 | 220-250 | 2.76-3.14 | 280-320 | 3.52-4.02 | 20.0-24.0 | 2.5-3.0 | |
| Y23 | 320-370 | 3.2-3.7 | 170-190 | 2.14-2.39 | 190-230 | 2.39-2.89 | 20.0-25.5 | 2.5-3.2 | |
| Y25 | 360-400 | 3.6-4.0 | 135-170 | 1.70-2.14 | 140-200 | 1.76-2.51 | 22.5-28.0 | 2.8-3.5 | |
| Y26H | 360-390 | 3.6-3.9 | 220-250 | 2.76-3.14 | 225-255 | 2.83-3.20 | 23.0-28.0 | 2.9-3.5 | |
| Y26H-1 | 360-390 | 3.6-3.9 | 200-250 | 2.51-3.14 | 225-255 | 2.83-3.20 | 23.0-28.0 | 2.9-3.5 | |
| Y26H-2 | 360-380 | 3.6-3.8 | 263-288 | 3.30-3.62 | 318-350 | 4.00-4.40 | 24.0-28.0 | 3.0-3.5 | |
| Y27H | 370-400 | 3.7-4.0 | 205-250 | 2.58-3.14 | 210-255 | 2.64-3.20 | 25.0-29.0 | 3.1-3.6 | |
| Y28 | 370-400 | 3.7-4.0 | 175-210 | 2.20-2.64 | 180-220 | 2.26-2.76 | 26.0-30.0 | 3.3-3.8 | |
| Y28H-1 | 380-400 | 3.8-4.0 | 240-260 | 3.02-3.27 | 250-280 | 3.14-3.52 | 27.0-30.0 | 3.4-3.8 | |
| Y28H-2 | 360-380 | 3.3-3.8 | 271-295 | 3.41-3.71 | 382-405 | 4.80-5.09 | 26.0-30.0 | 3.3-3.8 | |
| Y30 | 370-400 | 3.7-4.0 | 175-210 | 2.20-2.64 | 180-220 | 2.26-2.76 | 26.0-30.0 | 3.3-3.8 | |
| Y30BH | 380-390 | 3.8-3.9 | 223-235 | 2.80-2.95 | 231-245 | 2.90-3.08 | 27.0-30.0 | 3.4-3.8 | |
| Y30H-1 | 380-400 | 3.8-4.0 | 230-275 | 2.89-3.46 | 235-290 | 2.95-3.64 | 27.0-32.0 | 3.4-4.0 | |
| Y30H-2 | 395-415 | 3.95-4.15 | 275-300 | 3.46-3.77 | 310-335 | 3.90-4.21 | 27.0-32.5 | 3.4-4.1 | |
| Y32 | 400-420 | 4.0-4.2 | 160-190 | 2.01-2.39 | 165-195 | 2.07-2.45 | 30.0-33.5 | 3.8-4.2 | |
| Y32H-1 | 400-420 | 4.0-4.2 | 190-230 | 2.39-2.89 | 230-250 | 2.89-3.14 | 31.5-35.0 | 4.0-4.4 | |
| Y32H-2 | 400-440 | 4.0-4.4 | 224-240 | 2.81-3.02 | 230-250 | 2.89-3.14 | 31.0-34.0 | 3.9-4.3 | |
| Y33 | 410-430 | 4.1-4.3 | 220-250 | 2.76-3.14 | 225-255 | 2.83-3.20 | 31.5-35.0 | 4.0-4.4 | |
| Y33H | 410-430 | 4.1-4.3 | 250-270 | 3.14-3.39 | 250-275 | 3.14-3.46 | 31.5-35.0 | 4.0-4.4 | |
| Y34 | 420-440 | 4.2-4.4 | 200-230 | 2.51-2.89 | 205-235 | 2.58-2.95 | 32.5-36.0 | 4.1-4.5 | |
| Y35 | 430-450 | 4.3-4.5 | 215-239 | 2.70-3.00 | 217-241 | 2.73-3.03 | 33.1-38.2 | 4.2-4.8 | |
| Y36 | 430-450 | 4.3-4.5 | 247-271 | 3.10-3.41 | 250-274 | 3.14-3.44 | 35.1-38.3 | 4.4-4.8 | |
| Y38 | 440-460 | 4.4-4.6 | 285-305 | 3.58-3.83 | 294-310 | 3.69-3.90 | 36.6-40.6 | 4.6-5.1 | |
| Y40 | 440-460 | 4.4-4.6 | 330-354 | 4.15-4.45 | 340-360 | 4.27-4.52 | 37.5-41.8 | 4.7-5.3 | |
| American Standard | C1 | 230 | 2.3 | 148 | 1.86 | 258 | 3.5 | 8.36 | 1.05 |
| C5 | 380 | 3.8 | 191 | 2.4 | 199 | 2.5 | 27 | 3.4 | |
| C7 | 340 | 3.4 | 258 | 3.23 | 318 | 4 | 21.9 | 2.75 | |
| C8/C8A | 385 | 3.85 | 235 | 2.95 | 242 | 3.05 | 27.8 | 3.5 | |
| C8B | 420 | 4.2 | 232 | 2.913 | 236 | 2.96 | 32.8 | 4.12 | |
| C9 | 380 | 3.8 | 280 | 3.516 | 320 | 4.01 | 26.4 | 3.32 | |
| C10 | 400 | 4 | 280 | 3.52 | 284 | 3.57 | 30.4 | 3.82 | |
| C11 | 430 | 4.3 | 200 | 2.512 | 204 | 2.56 | 34.4 | 4.32 | |
| C12 | 400 | 4 | 290 | 3.65 | 318 | 4 | 32 | 4 | |
|
(IEC404-8-1) European Standard |
HF8/22 | 200/220 | 2.00/2.20 | 125/140 | 1.57/1.76 | 220/230 | 2.76/2.89 | 6.5/6.8 | 0.8/1.1 |
| HF20/19 | 320/333 | 3.20/3.33 | 170/190 | 2.14/2.39 | 190/200 | 2.39/2.51 | 20.0/21.0 | 2.5/2.7 | |
| HF20/28 | 310/325 | 3.10/3.25 | 220/230 | 2.76/2.89 | 280/290 | 3.52/3.64 | 20.0/21.0 | 2.5/2.7 | |
| HF22/30 | 350/365 | 3.50/3.65 | 255/265 | 3.20/3.33 | 290/300 | 3.64/3.77 | 22.0/23.5 | 2.8/3.0 | |
| HF24/16 | 350/365 | 3.50/3.65 | 155/175 | 1.95/2.20 | 160/180 | 2.01/2.26 | 24.0/25.5 | 3.0/3.2 | |
| HF24/23 | 350/365 | 3.50/3.65 | 220/230 | 2.76/2.89 | 230/240 | 2.89/3.01 | 24.0/25.5 | 3.0/3.2 | |
| HF24/35 | 360/370 | 3.60/3.70 | 260/270 | 3.27/3.39 | 350/360 | 4.40/4.52 | 24.0/25.5 | 3.0/3.2 | |
| HF26/16 | 370/380 | 3.70/3.80 | 155/175 | 1.95/2.20 | 160/180 | 2.01/2.26 | 26.0/27.0 | 3.2/3.4 | |
| HF26/18 | 370/380 | 3.70/3.80 | 175/185 | 2.20/2.33 | 180/190 | 2.26/2.39 | 26.0/27.0 | 3.3/3.4 | |
| HF26/24 | 370/380 | 3.70/3.80 | 230/240 | 2.89/3.01 | 240/250 | 3.01/3.14 | 26.0/27.0 | 3.3/3.4 | |
| HF26/26 | 370/380 | 3.70/3.80 | 230/240 | 2.89/3.01 | 260/270 | 3.27/3.39 | 26.0/27.0 | 3.3/3.4 | |
| HF26/30 | 385/395 | 3.85/3.95 | 260/270 | 3.27/3.39 | 300/310 | 3.77/3.89 | 26.0/27.0 | 3.3/3.4 | |
| HF28/26 | 385/395 | 3.85/3.95 | 250/265 | 3.14/3.33 | 260/275 | 3.27/3.45 | 28.0/30.0 | 3.5/3.8 | |
| HF28/28 | 385/395 | 3.85/3.95 | 260/270 | 3.27/3.39 | 280/290 | 3.50/3.60 | 28.0/30.0 | 3.5/3.8 | |
| HF30/26 | 395/405 | 3.95/4.05 | 250/260 | 3.14/3.33 | 260/270 | 3.27/3.39 | 30.0/31.5 | 3.8/3.9 | |
| HF32/17 | 410/420 | 4.10/4.20 | 160/170 | 2.01/2.14 | 165/175 | 2.07/2.20 | 32.0/33.0 | 4.0/4.1 | |
| HF32/22 | 410/420 | 4.10/4.20 | 215/225 | 2.70/2.83 | 220/230 | 2.76/2.89 | 32.0/33.0 | 4.0/4.1 | |
| HF32/25 | 410/420 | 4.10/4.20 | 240/250 | 3.01/3.14 | 250/260 | 3.14/3.27 | 32.0/33.0 | 4.0/4.1 | |
The above mentioned data of magnetic properties and physical properties are given at room temperature (20℃).
The max working temperature of magnet is changeable due to length-diameter ratio and other environment factors.
Additional grades are available. Please contact us for information.
2.Other characteristic physical properties
Following data are only for reference when designing and selecting materials, not as product acceptance standards.
| Item | Unit | Value |
|---|---|---|
| Recoil Permeability μrac | 1.05-1.10 | |
| Curie Temperture Tc | ℃ | 450 |
| Density | g/cm3 | 4.9-5.1 |
| Specific Heat | J/kg·K | 837 |
| Coefficient of Thermal Expansion | 10-6/°C |
C⊥: 10 C∥15 |
| Flexural Strength | MPa | 70 |
| Compressive Strength | MPa | 700 |
| Tensile Strength | MPa | 35 |
| Young's Modulus | Gpa | 200 |
| Vickers Hardness(HV) | 530 |
Bonded Ferrite Magnets
Injection ferrite magnets are a type of bonded magnets manufactured by mixing ferrite magnetic powder with the thermoplastic binder which then enables the magnet to be injection molded just like any other plastic would be. The maximum operating temperature of PA12 based, PA6 based, and PPS based magnet can achieve 120, 150, and 180 degrees Celsius, respectively. Injection ferrite magnets also have excellent mechanical strength, dimensional accuracy, shape applicability, and integrated ability with other functional parts, which totally same as injection molded Neodymium magnets. Its magnetic performance and cost is significantly lower than injection molded Neodymium magnet and widely served for sensors and low performance motors. Anisotropic injection ferrite magnet need to apply a permanent magnetic field or an electromagnetic field to align molten compound during the injection molding process.
Typical magnetic properties of bonded ferrite magnets
Magnetic properties of different manufacturers vary slightly. Following data are only for reference when designing and selecting materials.
| Grade |
Residual magnetic flux density Br |
Coercive force HcB |
Intrinsic coercive force HcJ |
Maximum energy product (BH)max |
Work Temperature Tw |
Average Temperature Coefficients of Br | Density | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ρ | |||||||||||
| mT | kGs | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | ℃ | %/℃ | g/cm3 | |
| BZ-F1.5 | 220-240 | 2.2-2.4 | 160-167 | 2.00-2.10 | 231-240 | 2.90-3.00 | 11.6-12.4 | 1.45-1.55 |
PA12: 120 PA6: 150 |
-0.19 | 3.25 |
| BZ-F1.9 | 270-290 | 2.7-2.9 | 180-186 | 2.25-2.33 | 216-228 | 2.70-2.85 | 14.8-15.6 | 1.85-1.95 | -0.19 | 3.63 | |
| BZ-F2.0 | 280-290 | 2.8-2.9 | 184-200 | 2.30-2.50 | 216-246 | 2.70-3.10 | 15.6-16.4 | 1.95-2.05 | -0.19 | 3.70 | |
| BZ-F2.1 | 280-290 | 2.8-2.9 | 190-204 | 2.38-2.55 | 216-249 | 2.80-3.12 | 16.4-17.2 | 2.05-2.15 | -0.19 | 3.75 | |
| BZ-F1.7 (PPS) | 250-260 | 2.5-2.6 | 167-175 | 2.10-2.20 | 208-216 | 2.60-2.70 | 13.6-14.0 | 1.70-1.75 | PPS: 180 | -0.19 | 3.65 |
The above mentioned data of magnetic properties and physical properties are given at room temperature (20℃).
The max working temperature of magnet is changeable due to length-diameter ratio and other environment factors.
Additional grades are available. Please contact us for information.
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