Ferrite Magnet

Ferrite Magnet Ferrite magnet is also called ceramic magnets. The main components of the raw materials are iron oxide,Website:http://www.astrongmagnet.com, barium carbonate or strontium carbonate. So it have two types, one is Barium ferrite magnet, and the other is Strontium ferrite magnet. The ferrite magnets have higher coercive fore, higher resistance to be demagnetized and higher corrosion resistance than other non-rare earth permanent magnets , belonging to the semiconductor type, the eddy current loss, coercive force, can be effectively applied to the air gap in the magnetic circuit, especially suitable for small permanent magnet generator and motor. It does not contain precious metals nickel, cobalt, rich sources of raw materials, process is not complicated, low cost, can replac the AlNiCo magnet. The maximum energy product (BH) max is relatively low, so in the case of equal energy, than the metal magnet size. Its temperature stability is poor, crisp texture, fragile, not resistant to shock and vibration, is not suitable for measuring instruments and precision requirements of the magnetic device. The main products of permanent magnet ferrite are anisotropic series. They can be used for making permanent magnet ignition motor, permanent magnet motor, permanent magnetic concentrator, permanent magnet crane head thrust magnetic bearing, magnetic separator, a loudspeaker, a microwave devices, magnetic films, hearing aids and so on. Physical property of hard ferrite magnet Parameters Mark Unit Value Note Relative Recoil Permeability rec rec 1.05~1.3 Curie temperature Tc C 460 The coefficient of Br to temperature Br C-1 -0.20% 0~100 C The coefficient of Hcj to temperature HCJ C-1 0.2%~0.5% 0~100 C Density D g/cm3 4.8~5.0 The coefficient of linear expansion R C-1 7~15   10-6 Hardness HV HV 480~580 Ceramic magnets industry standard of USA Grade Br      (mT) Hcb      (KA/m) Hcj      (KA/m) (BH)max      (KJ/m3) D      (g/cm3) C1 230 148 258 8.36 4.8 C5 380 191 199 27 4.8 C7 370 10 270 8 318 8 26.1 0.8 4.8 C8A 390 10 231 8 235 8 28.7 0.8 4.8 C8B 410 10 231 8 235 8 32.6 0.8 4.9 C9 380 10 279 8 318 8 26.2 0.8 4.8 C10 400 10 267 8 279 8 30.3 0.8 4.9 C11 420 10 223 8 227 8 34.2 0.8 4.9 C12 400 10 290 8 318 8 32.0 0.8 4.9 SJ/T10410-2000 permanent magnet ferrite standard Grade Br Hcb Hcj (BH)max mT Gs KA/m Oe KA/m Oe KJ/m3 MGOe Y8T 200~235 2000 125~160 1570 210~280 2610 6.5~9.5 0.8 Y22H 310~360 3100 220~250 2770 280~320 3520 20.0~24.0 2.5 Y25 360~400 3600 135~170 1700 140~200 1760 22.5~28.0 2.8 Y26H-1 360~390 3600 200~250 2512 225~255 2830 23.0~28.0 2.9 Y26H-2 360~380 3600 263~288 3300 318~350 4000 24.0~28.0 3.0 Y27H 350~380 3500 225~240 2830 235~260 2950 25.0~29.0 3.1 Y28 370~400 3700 175~210 2200 180~220 2260 26.0~30.0 3.3 Y28H-1 380~400 3800 240~260 3020 250~280 3140 27.0~30.0 3.4 Y28H-2 360~380 3600 271~295 3400 382~405 4800 26.0~30.0 3.3 Y30H-1 380~400 3800 230~275 2890 235~290 2950 27.0~32.5 3.4 Y30H-2 395~415 3950 275~300 3460 310~335 3900 27.0~32.0 3.4 Y32 400~420 4000 160~190 2010 165~195 2070 30.0~33.5 3.8 Y32H-1 400~420 4000 190~230 2390 230~250 2890 31.0~35.0 3.9 Y32H-2 400~440 4000 224~240 2810 230~250 2890 31.0~34.0 3.9 Y33 410~430 4100 220~250 2760 225~255 2830 31.5~35.0 4.0 Y33H 410~430 4100 250~270 3140 250~275 3140 31.5~35.0 4.0 Y34 420~440 4200 200~230 2510 205~235 2580 32.5~36.0 4.1 Y35 430~450 4300 215~239 2700 217~241 2730 33.1~33.2 4.2 Y36 440~450 4400 247~271 3100 250~374 3140 35.1~38.3 4.4 Y38 440~460 4400 285~305 3580 294~310 3690 36.6~40.6 4.6 Y40 450~460 4500 330~354 4150 340~360 4270 37.6~41.8 4.7 SJ285-77 permanent ferrite magnets standard Grade Br Hcb (BH)max T Gs KA/m Oe KJ/m3 MGOe Y10T 0.20 2000 128~160 1600~2000 6.4~9.6 0.8~1.2 Y15 0.28~0.36 2800~3600 128~192 1600~2400 14.3~17.5 1.8~2.2 Y20 0.32~0.38 3200~3800 128~192 1600~2400 18.3~21.5 2.3~2.7 Y25 0.35~0.39 3500~3900 152~208 1900~2600 22.3~25.5 2.8~3.2 Y30 0.38~0.42 3800~4200 160~216 2000~2700 26.3~29.5 3.3~3.7 Y35 0.40~0.44 4000~4400 176~224 2200~2800 30.3~33.4 3.8~4.2 Y15H 0.31 3100 232~248 2900~3100 17.5 2.2 Y20H 0.34 3400 248~264 3100~3300 21.5 2.7 Y25BH 0.36~0.39 3600~3900 176~216 2200~2700 23.9~27.1 3.0~3.4 Y30BH 0.38~0.40 3800~4000 224~240 2800~3000 27.1~30.3 3.4~3.8 German Standard (DIN 17410) Grade Br Hcb Hcj (BH)max mT kA/m kA/m kJ/m3 MGOe HF 8/22 Isotropic min 210 135 220 8 1 typ 220 145 250 9 1.1 HF 24/23 Anisotropic min 360 220 230 24 3 typ 370 230 260 25.5 3.2 HF 28/16 Anisotropic min 390 160 160 28 3.5 typ 400 170 170 30 3.8 HF 28/26 Anisotropic min 380 250 260 28 3.4 typ 390 265 280 29.5 3.6 HF 28/34 Anisotropic min 380 280 340 29 3.6 typ 390 290 360 31.5 4 HF 30/16 Anisotropic min 400 160 160 30 3.8 typ 410 170 170 31.5 3.9 HF 30/31 Anisotropic min 400 280 310 30 3.8 typ 405 285 320 31.5 4 HF 34/21 Anisotropic min 430 210 210 34 4.3 typ 440 215 220 35 4.4