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Soft ferrites
Ferrites that are used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese compounds. They have a low coercivity and are called soft ferrites. The low coercivity means the material's magnetization can easily reverse direction without dissipating much energy (hysteresis losses), while the material's high resistivity prevents eddy currents in the core, another source of energy loss. Because of their comparatively low losses at high frequencies, they are extensively used in the cores of RF transformers and inductors in applications such as switched-mode power supplies.
The most common soft ferrites are:
Manganese-zinc ferrite (MnZn, with the formula MnaZn(1-a)Fe2O4). MnZn have higher permeability and saturation induction than NiZn.
Nickel-zinc ferrite (NiZn, with the formula NiaZn(1-a)Fe2O4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1 MHz.
Hard ferrites
In contrast, permanent ferrite magnets are made of hard ferrites, which have a high coercivity and high remanence after magnetization. These are composed of iron oxide and barium or strontium carbonate. The high coercivity means the materials are very resistant to becoming demagnetized, an essential characteristic for a permanent magnet. They also conduct magnetic flux well and have a high magnetic permeability. This enables these so-called ceramic magnets to store stronger magnetic fields than iron itself. They are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30 to 160 kiloampere turns per meter (400 to 2000 oersteds).[3] The density of ferrite magnets is about 5g/cm3.
The most common hard ferrites are:
Strontium ferrite, SrFe12O19 (SrO·6Fe2O3), a common material for permanent magnet applications.
Barium ferrite, BaFe12O19 (BaO·6Fe2O3), a common material for permanent magnet applications. Barium ferrites are robust ceramics that are generally stable to moisture and corrosion-resistant. They are used in e.g. subwoofer magnets and as a medium for magnetic recording, e.g. on magnetic stripe cards.
Cobalt ferrite, CoFe2O4 (CoO·Fe2O3), used in some media for magnetic recording.[
Sintered NdFeB Magnet Grade Residual Induction (Br) Coercive Force (Hcb) Intrinsic Coercive Force (Hcj) Max Energy Product (BH)max Max Working Temp. T kGs kA/m kOe kA/m kOe Kj/m³ MGOe (°C) N35 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥955 ≥12 263-287 33-36 80 N38 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥955 ≥12 287-310 36-39 80 N40 1.25-1.28 12.5-12.8 ≥907 ≥11.4 ≥955 ≥12 302-326 38-41 80 N42 1.28-1.32 12.8-13.2 ≥915 ≥11.5 ≥955 ≥12 318-342 40-43 80 N45 1.32-1.38 13.2-13.8 ≥923 ≥11.6 ≥955 ≥12 342-366 43-46 80 N48 1.38-1.42 13.8-14.2 ≥923 ≥11.6 ≥955 ≥12 366-390 46-49 80 N50 1.40-1.45 14.0-14.5 ≥796 ≥10 ≥876 ≥11 374-406 47-51 60 N52 1.43-1.48 14.3-14.8 ≥796 ≥10 ≥876 ≥11 390-422 49-53 60 N35M 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥1114 ≥14 263-287 33-36 100 N38M 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥1114 ≥14 287-310 36-39 100 N40M 1.25-1.28 12.5-12.8 ≥923 ≥11.6 ≥1114 ≥14 302-326 38-41 100 N42M 1.28-1.32 12.8-13.2 ≥955 ≥12 ≥1114 ≥14 318-342 40-43 100 N45M 1.32-1.38 13.2-13.8 ≥955 ≥12.5 ≥1114 ≥14 342-366 43-46 100 N48M 1.37-1.43 13.7-14.3 ≥1027 ≥12.9 ≥1114 ≥14 366-390 46-49 100 N50M 1.40-1.45 14.0-14.5 ≥1033 ≥13 ≥1114 ≥14 382-406 48-51 100 N35H 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥1353 ≥17 263-287 33-36 120 N38H 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥1353 ≥ 17 287-310 36-39 120 N40H 1.25-1.28 12.5-12.8 ≥923 ≥11.6 ≥1353 ≥17 302-326 38-41 120 N42H 1.28-1.32 12.8-13.2 ≥955 ≥12 ≥1353 ≥17 318-342 40-43 120 N45H 1.32-1.36 13.2-13.6 ≥963 ≥12.1 ≥1353 ≥ 17 326-358 43-46 120 N48H 1.37-1.43 13.7-14.3 ≥995 ≥12.5 ≥1353 ≥17 366-390 46-49 120 N35SH 1.17-1.22 11.7-12.2 ≥876 ≥11 ≥1592 ≥20 263-287 33-36 150 N38SH 1.22-1.25 12.2-12.5 ≥907 ≥11.4 ≥1592 ≥20 287-310 36-39 150 N40SH 1.25-1.28 12.5-12.8 ≥939 ≥11.8 ≥1592 ≥20 302-326 38-41 150 N42SH 1.28-1.32 12.8-13.2 ≥987 ≥12.4 ≥1592 ≥20 318-342 40-43 150 N45SH 1.32-1.38 13.2-13.8 ≥1003 ≥12.6 ≥1592 ≥20 342-366 43-46 150 N28UH 1.04-108 10.4-10.8 ≥764 ≥9.6 ≥1990 ≥25 207-231 26-29 180 N30UH 1.08-1.13 10.8-11.3 ≥812 ≥10.2 ≥1990 ≥25 223-247 28-31 180 N33UH 1.13-1.17 11.3-11.7 ≥852 ≥10.7 ≥1990 ≥25 247-271 31-34 180 N35UH 1.17-1.22 11.7-12.2 ≥860 ≥10.8 ≥1990 ≥25 263-287 33-36 180 N38UH 1.22-1.25 12.2-12.5 ≥876 ≥11 ≥1990 ≥25 287-310 36-39 180 N40UH 1.25-1.28 12.5-12.8 ≥899 ≥11.3 ≥1990 ≥25 302-326 38-41 180 N42UH 1.28-1.32 12.8-13.2 ≥899 ≥11.3 ≥1990 ≥25 318-342 40-43 180 N28EH 1.04-1.08 10.4-10.8 ≥780 ≥9.8 ≥2388 ≥30 207-231 26-29 200 N30EH 1.08-1.13 10.8-11.3 ≥812 ≥10.2 ≥2388 ≥30 223-247 28-31 200 N33EH 1.13-1.17 11.3-11.7 ≥836 ≥10.5 ≥2388 ≥30 247-271 31-34 200 N35EH 1.17-1.22 11.7-12.2 ≥876 ≥11 ≥2388 ≥30 263-287 33-36 200 N38EH 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥2388 ≥30 287-310 36-39 200 N40EH 1.25-1.28 12.5-12.8 ≥899 ≥11.3 ≥2388 ≥30 302-326 38-41 200 N28AH 1.04-1.08 10.4-10.8 ≥787 ≥9.9 ≥2624 ≥33 207-231 26-29 230 N30AH 1.08-1.13 10.8-11.3 ≥819 ≥10.3 ≥2624 ≥33 223-247 28-31 230 N33AH 1.13-1.17 11.3-11.7 ≥843 ≥10.6 ≥2624 ≥33 247-271 31-34 230 N35AH 1.17-1.22 11.7-12.2 ≥876 ≥11 ≥2624 ≥33 263-287 33-36 230 N38AH 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥2624 ≥33 287-310 36-39 230 Mateirial : NDFEB MAGNET
Grade: N35
SIZE: D10X3 MM
Coating: CHROME PLATEDMagnetic Properties of Neodymium Magnets Grade Residual Induction Coercive Force Intrinsic Coercive Force Maximum Energy Product Maximum Working Temperature Br Hcb Hcj (BH)max Tw mT kA/m kA/m kJ/m3 [kGs] [kOe] [kOe] [MGOe] N35 1170-1220 ≥868 ≥955 263-287 80° [11.7-12.2] [≥10.9] [≥12] [33-36] N38 1220-1250 ≥899 ≥955 287-310 80° [12.2-12.5] [≥11.3] [≥12] [36-39] N40 1250-1280 ≥907 ≥955 302-326 80° [12.5-12.8] [≥11.4] [≥12] [38-41] N42 1280-1320 ≥915 ≥955 318-342 80° [12.8-13.2] [≥11.5] [≥12] [40-43] N45 1320-1380 ≥923 ≥955 342-366 80° [13.2-13.8] [≥11.6] [≥12] [43-46] N48 1380-1420 ≥923 ≥955 366-390 80° [13.8-14.2] [≥11.6] [≥12] [46-49] N50 1400-1450 ≥796 ≥876 382-406 80° [14.0-14.5] [≥10.0] [≥11] [48-51] N52 1430-1480 ≥796 ≥876 398-422 80° [14.3-14.8] [≥10.0] [≥11] [50-53] 30M 1080-1130 ≥805 ≥1114 223-247 100° [10.8-11.3] [≥10.1] [≥14] [28-31] 33M 1130-1170 ≥836 ≥1114 247-263 100° [11.3-11.7] [≥10.5] [≥14] [31-33] 35M 1170-1220 ≥868 ≥1114 263-287 100° [11.7-12.2] [≥10.9] [≥14] [33-36] 38M 1220-1250 ≥899 ≥1114 287-310 100° [12.2-12.5] [≥11.3] [≥14] [36-39] 40M 1250-1280 ≥923 ≥1114 302-326 100° [12.5-12.8] [≥11.6] [≥14] [38-41] 42M 1280-1320 ≥955 ≥1114 318-342 100° [12.8-13.2] [≥12.0] [≥14] [40-43] 45M 1320-1380 ≥995 ≥1114 342-366 100° [13.2-13.8] [≥12.5] [≥14] [43-46] 48M 1370-1430 ≥1027 ≥1114 366-390 100° [13.7-14.3] [≥12.9] [≥14] [46-49] 50M 1400-1450 ≥1033 ≥1114 382-406 100° [14.0-14.5] [≥13.0] [≥14] [48-51] 35H 1170-1220 ≥868 ≥1353 263-287 120° [11.7-12.2] [≥10.9] [≥17] [33-36] 38H 1220-1250 ≥899 ≥1353 287-310 120° [12.2-12.5] [≥11.3] [≥17] [36-39] 40H 1250-1280 ≥923 ≥1353 302-326 120° [12.5-12.8] [≥11.6] [≥17] [38-41] 42H 1280-1320 ≥955 ≥1353 318-342 120° [12.8-13.2] [≥12.0] [≥17] [40-43] 45H 1320-1360 ≥963 ≥1353 342-366 120° [13.2-13.6] [≥12.1] [≥17] [43-46] 48H 1370-1430 ≥995 ≥1353 366-390 120° [13.7-14.3] [≥12.5] [≥17] [46-49] 35SH 1170-1220 ≥876 ≥1592 263-287 150° [11.7-12.2] [≥11.0] [≥20] [33-36] 38SH 1220-1250 ≥907 ≥1592 287-310 150° [12.2-12.5] [≥11.4] [≥20] [36-39] 40SH 1250-1280 ≥939 ≥1592 302-326 150° [12.5-12.8] [≥11.8] [≥20] [38-41] 42SH 1280-1320 ≥987 ≥1592 318-342 150° [12.8-13.2] [≥12.4] [≥20] [40-43] 45SH 1320-1380 ≥1003 ≥1592 342-366 150° [13.2-13.8] [≥12.6] [≥20] [43-46] 28UH 1040-1080 ≥764 ≥1990 207-231 180° [10.4-10.8] [≥9.6] [≥25] [26-29] 30UH 1080-1130 ≥812 ≥1990 223-247 180° [10.8-11.3] [≥10.2] [≥25] [28-31] 33UH 1130-1170 ≥852 ≥1990 247-271 180° [11.3-11.7] [≥10.7] [≥25] [31-34] 35UH 1170-1220 ≥860 ≥1990 263-287 180° [11.7-12.2] [≥10.8] [≥25] [33-36] 38UH 1220-1250 ≥876 ≥1990 287-310 180° [12.2-12.5] [≥11.0] [≥25] [36-39] 40UH 1250-1280 ≥899 ≥1990 302-326 180° [12.5-12.8] [≥11.3] [≥25] [38-41] 28EH 1040-1080 ≥780 ≥2388 207-231 200° [10.4-10.8] [≥9.8] [≥30] [26-29] 30EH 1080-1130 ≥812 ≥2388 223-247 200° [10.8-11.3] [≥10.2] [≥30] [28-31] 33EH 1130-1170 ≥876 ≥2388 247-271 200° [11.3-11.7] [≥10.5] [≥30] [31-34] 35EH 1170-1220 ≥876 ≥2388 263-287 200° [11.7-12.2] [≥11.0] [≥30] [33-36] 38EH 1220-1250 ≥899 ≥2388 287-310 200° [12.2-12.5] [≥11.3] [≥30] [36-39] 28AH 1040-1080 ≥787 ≥2624 207-231 220° [10.4-10.8] [≥9.9] [≥33] [26-29] 30AH 1080-1130 ≥819 ≥2624 223-247 220° [10.8-11.3] [≥10.3] [≥33] [28-31] 33AH 1130-1170 ≥843 ≥2624 247-271 220° [11.3-11.7] [≥10.6] [≥33] [31-34]
The Physical Properties of Neodymium MagnetsParameters Units Indicators Density g/cm³ ≥7.3 Home temperature ℃ 310-340 BrReversible temperature coefficient ℃/% -0.100~-0.130 HcjReversible temperature coefficient ℃/% 0.40~0.70 Compressive strength N/mm2 1050 Bending strength N/mm2 250 Tensile strength N/mm2 80 Webster Hardness 600 Coefficient of thermal expansion(20 to 200℃) 10-6/k ∥5⊥-1.5 Specific heat J/(Kg.K) 460 Thermal conductivity W/(m.K) 9 Resistivity μΩ.cm 150
The Surface Coatings of Neodymium MagnetsSurface Coating Coating Method Coating thickness(m) Coating Color Coating features Nickel plating ≥5 Yellow Corrosion resistance strong,with outstanding resistance to high temperature and humidity capabilities zinc plating ≥5 Silvery white Has strong corrosion resistance,anti-salt spray test ability . gold plating ≥5 gold Has outstanding resistance to high temperature capability,corrosion resistance,good resistance to color change ablity Ni-Cu-Ni plating 15-30 sliver strong corrosion resistance Epoxy Electrophoresis 15-20 Black/grey strong corrosion resistance,outstanding resistance to salt spray,strong resistance to high temperature, high humidity capacity