Ferrite / Ceramic Data Sheet

Ferrite / Ceramic Data Sheet Ferrite / Ceramic Magnets These magnets are the best choice for low cost applications. They are excellent at resisting corrosion due to water. Their properties make them an excellent choice when used in motors, loudspeakers and clamping devices and for use with reed switches. Chinese Standard - commonly used globally, especially in UK and EU Typical Range of Values <ul style="display: flex;"><li style="flex:1">Br </li><li style="flex:1">Hc (Hcb) </li><li style="flex:1">Hci (Hcj) </li><li style="flex:1">BHmax </li></ul>kJ/m3 Material <ul style="display: flex;"><li style="flex:1">mT </li><li style="flex:1">kG </li><li style="flex:1">kA/m </li><li style="flex:1">kOe </li><li style="flex:1">kA/m </li><li style="flex:1">kOe </li><li style="flex:1">MGOe </li></ul>0.8-1.2 0.8-1.2 2.3-2.8 2.5-3.0 2.5-3.2 2.8-3.5 2.9-3.5 2.9-3.5 3.0-3.5 3.1-3.6 3.3-3.8 3.4-3.8 3.3-3.8 3.3-3.8 3.4-3.8 3.4-4.0 3.4-4.1 3.8-4.2 4.0-4.4 3.9-4.3 4.0-4.4 4.0-4.4 4.1-4.5 4.2-4.8 4.4-4.8 4.6-5.1 4.7-5.3 Y8T Y10T Y20 200-235 200-235 320-380 310-360 320-370 360-400 360-390 360-390 360-380 370-400 370-400 380-400 360-380 370-400 380-390 380-400 395-415 400-420 400-420 400-440 410-430 410-430 420-440 430-450 430-450 440-460 440-460 2.0-2.35 2.0-2.35 3.2-3.8 3.1-3.6 3.2-3.7 3.6-4.0 3.6-3.9 3.6-3.9 3.6-3.8 3.7-4.0 3.7-4.0 3.8-4.0 3.3-3.8 3.7-4.0 3.8-3.9 3.8-4.0 3.95-4.15 4.0-4.2 4.0-4.2 4.0-4.4 4.1-4.3 4.1-4.3 4.2-4.4 4.3-4.5 4.3-4.5 4.4-4.6 4.4-4.6 125-160 128-160 135-190 220-250 170-190 135-170 220-250 200-250 263-288 205-250 175-210 240-260 271-295 175-210 223-235 230-275 275-300 160-190 190-230 224-240 220-250 250-270 200-230 215-239 247-271 285-305 330-354 1.57-2.01 1.61-2.01 1.70-2.39 2.76-3.14 2.14-2.39 1.70-2.14 2.76-3.14 2.51-3.14 3.30-3.62 2.58-3.14 2.20-2.64 3.02-3.27 3.41-3.71 2.20-2.64 2.80-2.95 2.89-3.46 3.46-3.77 2.01-2.39 2.39-2.89 2.81-3.02 2.76-3.14 3.14-3.39 2.51-2.89 2.70-3.00 3.10-3.41 3.58-3.83 4.15-4.45 210-280 210-280 140-195 280-320 190-230 140-200 225-255 225-255 318-350 210-255 180-220 250-280 382-405 180-220 231-245 235-290 310-335 165-195 230-250 230-250 225-255 250-275 205-235 217-241 250-274 294-310 340-360 2.64-3.52 2.64-3.52 6.5-9.5 6.4-9.6 Physical Characteristics <ul style="display: flex;"><li style="flex:1">Characteristic </li><li style="flex:1">Symbol </li><li style="flex:1">Unit </li></ul>g/cc Value 4.9 to 5.1 400 to 700 680-720 15 1.76-2.45 18.0-22.0 3.52-4.02 20.0-24.0 2.39-2.89 20.0-25.5 1.76-2.51 22.5-28.0 2.83-3.20 23.0-28.0 2.83-3.20 23.0-28.0 4.00-4.40 24.0-28.0 2.64-3.20 25.0-29.0 2.26-2.76 26.0-30.0 3.14-3.52 27.0-30.0 4.80-5.09 26.0-30.0 2.26-2.76 26.0-30.0 2.90-3.08 27.0-30.0 2.95-3.64 27.0-32.0 3.90-4.21 27.0-32.5 2.07-2.45 30.0-33.5 2.89-3.14 31.5-35.0 2.89-3.14 31.0-34.0 2.83-3.20 31.5-35.0 3.14-3.46 31.5-35.0 2.58-2.95 32.5-36.0 2.73-3.03 33.1-38.2 3.14-3.44 35.1-38.3 3.69-3.90 36.6-40.6 4.27-4.52 37.5-41.8 <ul style="display: flex;"><li style="flex:1">Density </li><li style="flex:1">D</li></ul>Y22H Y23 Vickers Hardness Compression Strength Coefficient of Thermal Expansion <ul style="display: flex;"><li style="flex:1">Hv </li><li style="flex:1">D.P.N </li></ul>N/mm2 10-6/C 10-6/C J/kg°C m Ω.cm W/cm°C Pa C.S Y25 C// Y26H Y26H-1 Y26H-2 Y27H Y28 C^ 10 Specific Heat Capacity Electrical Resistivity Thermal Conductivity Modulus of Elasticity Compression Strength Tensile Strength <ul style="display: flex;"><li style="flex:1">c</li><li style="flex:1">795-855 </li></ul>1x1010 rk0.029 1.8x1011 895x106 34x106 62x106 7l / E Y28H-1 Y28H-2 Y30 <ul style="display: flex;"><li style="flex:1">C.S. </li><li style="flex:1">Pa </li></ul>σUTS or S U Pa Flexural Strength Hardness sPa Y30BH Y30H-1 Y30H-2 Y32 Mohs Poisson's Ratio n0.28 Curie Temperature Tc <ul style="display: flex;"><li style="flex:1">°C </li><li style="flex:1">450 </li></ul>Y32H-1 Y32H-2 Y33 Maximum and Minimum Working Temperatures (Note - this varies with the magnetic working point!) The maximum recommended operating temperature is +250 to +300 degrees C. The minimum operating temperature varies with the magnet shape and magnetic circuit. It could be as low as -60 degrees C but may be as high as 0 (zero) degrees C. Y33H Y34 Y35 Y36 Corrosion Resistance Ferrite magnets are essentially made from oxides of iron and Strontium and Barium. Y38 Y40 They cannot corrode in water. They are sometimes regarded as being 'magnetic rust'. Corrosion resistance is therefore excellent. American Standard - also used in UK Typical Values Temperature coefficients <ul style="display: flex;"><li style="flex:1">Br </li><li style="flex:1">Hc (Hcb) </li><li style="flex:1">Hci (Hcj) </li><li style="flex:1">BHmax </li></ul>Rev.Temp.Coef. of Intrinsic Coercivity (Hci), <ul style="display: flex;"><li style="flex:1">Material </li><li style="flex:1">Rev.Temp.Coef. of Induction (Br), a, %/°C </li></ul>kJ/m3 kOe b, %/°C mT 230 380 340 385 420 380 400 430 400 <ul style="display: flex;"><li style="flex:1">kG </li><li style="flex:1">kA/m </li></ul>148 191 258 235 232 280 280 200 290 kOe 1.86 2.40 3.23 2.95 2.91 3.52 3.52 2.51 3.65 kA/m 258 199 318 242 236 320 284 204 318 MGOe 1.05 3.40 2.75 3.50 4.12 3.32 3.82 4.32 4.00 C1 C5 2.30 3.80 3.40 3.85 4.20 3.80 4.00 4.30 4.00 3.50 2.50 4.00 3.05 2.96 4.01 3.57 2.56 4.00 8.36 27.0 21.9 27.8 32.8 26.4 30.4 34.4 32.0 -0.2 (+) 0.27 C7 Example of a BH curve (second quadrant demagnetisation) Ferrite C5 (room temperature) C8 / C8A C8B C9 0.40 Br Bdi Intrinsic working point 0.35 Intrinsic 'Knee' C10 C11 C12 Normal 0.30 0.25 Bd European Standard (IEC 60404-8-1) Normal working point 0.20 Values (min/typical) <ul style="display: flex;"><li style="flex:1">Br </li><li style="flex:1">Hc (Hcb) </li><li style="flex:1">Hci (Hcj) </li><li style="flex:1">BHmax </li></ul>Material 0.15 0.10 0.05 kJ/m3 <ul style="display: flex;"><li style="flex:1">mT </li><li style="flex:1">kG </li><li style="flex:1">kA/m </li><li style="flex:1">kOe </li><li style="flex:1">kA/m </li><li style="flex:1">kOe </li><li style="flex:1">MGOe </li></ul>0.8/1.1 2.5/2.7 2.5/2.7 2.8/3.0 3.0/3.2 3.0/3.2 3.0/3.2 3.2/3.4 3.3/3.4 3.3/3.4 3.3/3.4 3.3/3.4 3.5/3.8 3.5/3.8 3.8/3.9 4.0/4.1 4.0/4.1 4.0/4.1 Bd (kG) x Hd (kOe) = Energy Product (MGOe) at that working point HF8/22 HF20/19 HF20/28 HF22/30 HF24/16 HF24/23 HF24/35 HF26/16 HF26/18 HF26/24 HF26/26 HF26/30 HF28/26 HF28/28 HF30/26 HF32/17 HF32/22 HF32/25 200/220 320/333 310/325 350/365 350/365 350/365 360/370 370/380 370/380 370/380 370/380 385/395 385/395 385/395 395/405 410/420 410/420 410/420 2.00/2.20 3.20/3.33 3.10/3.25 3.50/3.65 3.50/3.65 3.50/3.65 3.60/3.70 3.70/3.80 3.70/3.80 3.70/3.80 3.70/3.80 3.85/3.95 3.85/3.95 3.85/3.95 3.95/4.05 4.10/4.20 4.10/4.20 4.10/4.20 125/140 170/190 220/230 255/265 155/175 220/230 260/270 155/175 175/185 230/240 230/240 260/270 250/265 260/270 250/260 160/170 215/225 240/250 1.57/1.76 2.14/2.39 2.76/2.89 3.20/3.33 1.95/2.20 2.76/2.89 3.27/3.39 1.95/2.20 2.20/2.33 2.89/3.01 2.89/3.01 3.27/3.39 3.14/3.33 3.27/3.39 3.14/3.33 2.01/2.14 2.70/2.83 3.01/3.14 220/230 190/200 280/290 290/300 160/180 230/240 350/360 160/180 180/190 240/250 260/270 300/310 260/275 280/290 260/270 165/175 220/230 250/260 <ul style="display: flex;"><li style="flex:1">2.76/2.89 </li><li style="flex:1">6.5/6.8 </li></ul>2.39/2.51 20.0/21.0 3.52/3.64 20.0/21.0 3.64/3.77 22.0/23.5 2.01/2.26 24.0/25.5 2.89/3.01 24.0/25.5 4.40/4.52 24.0/25.5 2.01/2.26 26.0/27.0 2.26/2.39 26.0/27.0 3.01/3.14 26.0/27.0 3.27/3.39 26.0/27.0 3.77/3.89 26.0/27.0 3.27/3.45 28.0/30.0 3.50/3.60 28.0/30.0 3.27/3.39 30.0/31.5 2.07/2.20 32.0/33.0 2.76/2.89 32.0/33.0 3.14/3.27 32.0/33.0 <ul style="display: flex;"><li style="flex:1">Hd </li><li style="flex:1">Hci </li></ul>-200 Hc 0.00 <ul style="display: flex;"><li style="flex:1">-250 </li><li style="flex:1">-150 </li><li style="flex:1">-100 </li><li style="flex:1">-50 </li><li style="flex:1">0</li></ul>Applied Field, H (kA/m) Additional Notes Ferrite / Ceramic magnets are permanent magnets. They have no relationship to soft magnetic ferrites. Soft magnetic ferrites such as used in transformer cores have totally different magnetic properties. The magnet shape, magnetic circuit and temperature affects the operation of the magnet. When determining suitability, use the Intrinsic curve during analysis (not the Normal curve). Maximum performance is obtained by keeping the intrinsic working point above the 'knee'. In ferrite magnets the Hci actually increases with rising temperature (a benefit in electric motors). So at higher temperatures their resistance to demagnetising increases. But demagnetisation is possible in colder temperatures (e.g. freezing conditions) but a high working point reduces this risk. Ferrite magnets have excellent corrosion resistance - they do not rust or degrade when in water. Anisotropic grades (direction of magnetisation locked in structure) are stronger than isotropic grades. Isotropic (unoriented) grade: e.g. C1; Anisotropic (oriented) grades: e.g. C5, C7, C8. Tolerances:- +/-3% is common, +/-0.25mm is also commonly used (tolerances depend on shape). If in any doubt, please contact us for technical assistance. Quick Cross Reference Guide <a href="/goto?url=http://www.buntingeurope.com" target="_blank">www.buntingeurope.com [email protected] </a>C5=Feroba2=Fer2=Y30=HF26/18, C8/C8A=Feroba3=Fer3=Y30H-1. C1=Y10T / Y8T, C7=Y26H-2, C8B=Y33, C9=Y30H-2, C10=Y33H, C11=Y34, C12=Y30H-2. We reserve the right to change any of the above information without notice and cannot accept any responsibility or liability for errors or problems caused by using any of the above information. Copyright © Bunting Magnetics Europe Ltd. All Rights Reserved.

Ferrite / Ceramic Data Sheet

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