Hard ferrite magnets

Ferrite magnets are ferromagnetic metal oxides, sometimes referred to as "ceramic magnets" because of their preparation and appearance similar to ceramics. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it has higher dielectric properties. Ferrite magnetism also exhibits high magnetic permeability at high frequencies. As a result, ferrite has become a non-metallic magnetic material widely used in high frequency and weak current fields.

The material became commercially available in the mid-1950s and has since found its way into countless applications, including curved magnets for electric motors, magnetic chucks and magnetic tools. It is one of the most widely used permanent magnet materials in the world. Although permanent strontium ferrite does not have the high energy product and coercive force of NdFeB permanent magnet materials, it has little environmental pollution, strong environmental resistance, low price and wide application. Ferrite magnets are used in applications where the magnets can or need to be relatively large and the cost needs to be as economical as possible. Permanent magnet materials can provide stable and long-lasting magnetic flux without consuming electric energy, which is one of the important means of saving energy.

Permanent magnet motors are typical high-efficiency, energy-saving, and low-carbon industrial products, and are widely used in various industrial transmission and rotating devices. Ferrite magnetic tiles or magnetic sheets are generally used as motor stators, and are mainly used in various motors such as automobiles, motorcycles, home appliances, power tools, and fitness equipment.

Permanent ferrite magnets are made of hard ferrite with high coercive force and high remanence after magnetization. A high coercivity means the material is very resistant to demagnetization, an essential property of permanent magnets.
High corrosion resistance, acid resistance, salt resistance, lubricant resistance.

The magnetic properties of ferrite magnet tiles show high permeability at high frequencies. Therefore, ferrite has become a non-metallic magnetic material with a wide range of applications in the field of high frequency and weak current. and have excellent practical properties that outperform metallic magnets and can be mass-produced at a high cost-performance ratio, perfectly suited for higher volume production runs.

ferrite magnets physical properties

Composition MO· 6Fe2O3(M means Ba, Sr or their mixture)
Recoil relative permiability 1.05- 1.3 [ μrec]
Density 4.8-5. 1 g/cm3
Curie Temp. 460-480°C
Thermal Conductivity 5- 10 W/m k
Poission's Ratio 0.28
Electric Resistivity ≥ 10000 Ω ·cm
Temp. Coeff. of Br - 0.2 %/°C
Temp. Coeff. of Hcj 0.2-0.5 %/°C
Vickers Hardness 480-580Hv
Linear Expansion Coefficient 7- 15*10⁶/°C^(- 1)
Specific Heat 0. 15-0.20 cal/g ·ºC
Flexural Strength 5-9 [kgf/mm2]
Compressive Strength > 70 [kgf/mm2]
Tensile Strength 0.2-0.5*108N/mm2
Young's modulus 120- 180 kN/mm2

Chinese Standard - Commonly used globally, especially in UK and EU

Material Br Hcb (Hc) Hcj (Hci) (BH)max
Grade mT kG kA/m kOe kA/m kOe kJ/m^3 MGOe
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 (still in use but limited range)

Material Br Hcb (Hc) Hcj (Hci) (BH)max
Grade mT kG kA/m kOe kA/m kOe kJ/m^3 MGOe
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

European Standard (still in use but rarely outside mainland Europe)

Material Br Hcb (Hc) Hcj (Hci) (BH)max
Grade mT kG kA/m kOe kA/m kOe kJ/m^3 MGOe
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

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