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ceramic magnets

Ceramic Magnet | Knowledge for Professional Buyers

The origin of ceramic magnets

Ceramic magnets (also known as ferrite magnets or hard ferrite) are developed at Philips Physics Laboratory in 1950s. They became commercially available in the 1960s due to its low cost and high magnetic performance. People call them ceramic magnets because 1) the sintering process of this magnet material is similar to ceramic and 2) both are electrically insulating. Permanent magnets really penetrated into our everyday life with the commercialization of hard ferrite. Prior to ferrite magnets, only AlNiCo magnets had dominated the permanent magnet market.

ceramic arc magnets

What makes ceramic magnets different?

Comparing to other permanent magnets, hard ferrite has a low maximum energy product of up to 5.5MGOe. However, its high coercivity and cost-effectiveness make it an ideal magnetic material for a variety of applications. Measuring by weight, it accounts for over 75% of the global permanent magnet consumption. Ferrite arc magnet is also an important component in electric motors.

  • low cost
  • high magnetic performance
  • high temperature resistance (≤ 250℃)
  • high resistance to demagnetization

How are ceramic magnets manufactured?

ceramic ring magnet speaker magnet
ceramic ring blank after wet-press in a mold
GradeBrHcbHcj(BH)max
mTkGskA/mkOekA/mkOekJ/m3MGOe
Y20320-3803.2-3.8135-1901.70-2.38140-1951.76-2.4518.0-22.02.3-2.8
Y22H310-3603.1-3.6220-2502.77-3.14280-3203.52-4.0220.0-24.02.5-3.0
Y23320-3703.2-3.7170-1902.14-2.39190-2302.39-2.8920.0-25.52.5-3.2
Y25360-4003.6-4.0135-1701.70-2.14140-2001.76-2.5122.5-28.02.8-3.5
Y26H360-3903.6-3.9220-2502.77-3.14225-2552.83-3.2123.0-28.02.9-3.5
Y27H370-4003.7-4.0205-2502.58-3.14210-2552.64-3.2125.0-29.03.1-3.7
Y30380-4003.8-4.0175-2102.20-2.64180-2202.26-2.7726.0-30.03.3-3.8
Y30BH380-4003.8-4.0223-2352.80-2.95231-2452.90-3.0827.0-30.03.3-3.8
Y30H-1380-4003.8-4.0230-2752.89-3.46235-2902.95-3.6527.0-32.03.4-4.0
Y30H-2395-4153.95-4.15275-3003.46-3.77310-3353.90-4.2128.5-32.53.5-4.1
Y32400-4204.0-4.2160-1902.01-2.38165-1952.07-2.4530.0-33.53.8-4.2
Y33410-4304.1-4.3220-2502.77-3.14225-2552.83-3.2131.5~35.04.0-4.4
Y35400-4404.0-4.4176-2242.22-2.8180-2302.26-2.8930.3-33.43.8-4.2
GradeBrHcbHcj(BH)max
mTkGskA/mkOekA/mkOekJ/m3MGOe
C12302.31481.862583.58.361.05
C53803.81912.41992.527.03.4
C73403.42583.233184.021.92.75
C83853.852352.952423.0527.83.5
C8B4204.22322.9132362.9632.84.12
C93803.82803.5163204.0126.43.32
C104004.02883.6172803.5130.43.82
C114304.32002.5122042.5634.44.32
ferrite block magnet 6x4x1
ferrite block magnet 6x4x1
ceramic ring magnets
ceramic ring magnets
ferrite arc magnet
ferrite arc magnet
ceramic arc magnets
ceramic arc magnets

Physical Properties of ceramic magnets

Ceramic Magnets – Typical Physical Properties
PropertyUnitsValue Ceramic (Strontium Ferrite)
Vickers HardnessHv~ 1160 (7 Mohs)
Densityg/cm34.5 to 5.1
Curie Temp TC°C450 to 460
Curie Temp TF°F840 to 860
*Specific ResistanceμΩ⋅Cm> 106
Bending StrengthkN/mm20.05 – 0.09
Tensile StrengthkN/mm2.02 to .05
Thermal Expansion (∥)°C-1+11.0 to +16.0 x10-6
Thermal Expansion (⊥)°C-1‘+7.0 to +15.0 x 10-6

About Tengye: Tengye supplies finest permanent magnet materials to world industry. We work closely with our customer from designing stage to mass production. 

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