General Introduction of Sintered Ferrite Magnet, Hard Ferrite
Sintered Ferrite magnet (Ceramic Magnets, Hard Ferrite Magnet) were developed in the 1960's as a low cost alternative to metallic magnets. Even though they exhibit low energy (compared with other permanent magnet materials) and are relatively brittle and hard, Sintered Ferrite magnet (ceramic magnets, Hard ferrite magnet) have won wide acceptance due to their good resistance to demagnetization, excellent corrosion resistance and low price per pound. In fact, measured by weight, ferrite represents more than 75 percent of the world magnet consumption. Sintered Ferrite Magnet (Hard Ferrite Magnet) is the first choice for most types of DC motors, magnetic separators, magnetic resonance imaging and automotive sensors. The elements of Sintered NdFeB Magnet (Hard Ferrite magnet) are ferric oxide/barium, strontium. Ferrite has higher coercive force and higher resistance to be demagnetized and oxidized than other non-rare earth permanent magnets. The biggest advantage of such magnet is their low cost. It is widely used from motors and loudspeakers to toys and craft, industrial holding magnet etc. Besides industrial application, Sintered Ferrite magnet (Ceramic Magnets, Hard Ferrite Magnet) are widely use in Educational area.
What shapes can it be formed?
Magnetic properties of Sintered Ferrite Magnet (ceramic magnets, Hard ferrite magnet)
Chinese standard Br Material mT Y10T Y20 Y22H Y23 Y25 Y26H Y27H Y30 Y30BH Y30-1 Y30H-2 Y32 Y33 Y35 200~235 320~380 310~360 320~370 360~380 360~390 370~400 370~400 380~390 380~400 395~415 400~420 410~430 400~410 KGs 2.0~2.35 3.2~3.8 3.1~3.6 3.2~3.7 3.6~4.0 3.6~3.9 3.7~4.0 3.7~4.0 3.8~3.90 3.8~4.0 3.95~4.15 4.0~4.2 4.1~4.3 4.00~4.10 KA/m 125~160 135~190 220~250 170~190 135~170 220~250 205~250 175~210 223~235 230~275 275~300 160~190 220~250 175~195 KOe 1.57~2.01 1.70~2.38 2.77~3.14 2.14~2.38 1.70~2.14 2.77~3.14 2.58~3.14 2.20~2.64 2.80~2.95 2.89~3.46 3.46~3.77 2.01~2.38 2.77~3.14 2.20~2.45 KA/m 210~280 140~195 280~320 190~230 140~200 225~255 210~255 180~220 231~245 235~290 310~335 165~195 225~255 180~200 KOe 2.64~3.52 1.76~2.45 3.52~4.02 2.39~2.89 1.76~2.51 2.83~3.21 2.64~3.21 2.26~2.77 2.90~3.08 2.95~3.65 3.90~4.21 2.07~2.45 2.83~3.21 2.26~2.51 Hcb Hcj (BH)max KJ/m3 6.5~9.5 18.0~22.0 20.0~24.0 20.0~25.5 22.5~28.0 23.0~28.0 25.0~29.0 26.0~30.0 27.0~30.0 27.0~32.0 28.5~32.5 30.0~33.5 31.5~35.0 30.0~32.0 MGOe 0.8~1.2 2.3~2.8 2.5~3.0 2.5~3.2 2.8~3.5 2.9~3.5 3.1~3.7 3.3~3.8 3.4~3.7 3.4~4.0 3.5~4.0 3.8~4.2 4.0~4.4 3.8~4.0
USA standard Br Material mT C1 C5 C7 C8(=C8A) C8B C9 C10 C11 230 380 340 385 420 380 400 430 KGs 2.3 3.8 3.4 3.85 4.2 3.8 4.0 4.3 KA/m 148 191 258 235 232 280 288 200 KOe 1.86 2.4 3.23 2.95 2.913 3.516 3.617 2.512 KA/m 258 199 318 242 236 320 280 204 KOe 3.5 2.5 4.00 3.05 2.96 4.01 3.51 2.56 8.36 27 21.9 27.8 32.8 26.4 30.4 34.4 Hcb Hcj KJ/m
3
(BH)max MGOe 1.05 3.4 2.75 3.5 4.12 3.32 3.82 4.32
Europe standard The standard from International Electronics Committee (IEC404-8-1) O×100=Y10T=C1 ×300=Y30=C5 O×330=Y30 BH Allowed Value (min-typical) Grade mT 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 Br KGs 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 KA/m 125-140 170-190 220-230 255-265 155-175 220-230 260-270 155-175 175-190 230-240 230-240 260-270 250-265 260-270 250-260 160-180 215-225 240-250 Hcb KOe 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 2.20-2.39 2.89-3.01 2.89-3.01 3.27-3.39 3.14-3.33 3.27-3.39 3.14-3.33 2.01-2.26 2.70-2.83 3.01-3.14 KA/m 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 BrHcj KOe 2.76-2.89 2.39-2.51 3.52-3.64 3.64-3.77 2.01-2.26 2.89-3.01 4.40-4.52 2.01-2.26 2.26-2.39 3.01-3.14 3.27-3.39 3.77-3.89 3.27-3.45 3.50-3.60 3.27-3.39 2.07-2.20 2.76-2.89 3.14-3.27 KJ/m3 6.5-6.8 20.0-21.0 20.0-21.0 22.0-23.5 24.0-25.5 24.0-25.5 24.0-25.5 26.0-27.0 26.0-27.0 26.0-27.0 26.0-27.0 26.0-27.0 28.0-30.0 28.0-30.0 30.0-31.5 32.0-33.0 32.0-33.0 32.0-33.0 (BH)max MGOe 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