CeramicMagnet or Ferrite Magnet ,are produced by calcining a mixture of iron oxide and strontium carbonate to form a metallic oxide. The materials would be milled to small particle size, then the powder will be formed in a die. There are two method, first method, the powder is compacted dry which develops an isotropic magnet with weaker magnetic properties,but better on dimensional tolerances,that don’t require finish grinding usually. Another method,the powder is mixed with water to form slurry, the slurry is compacted in a die in the presence of a magnetic field. The second method is producing anisotropic magnet which exhibits better magnetic properties.

      <ul class="check">
        <li>Ceramic Magnet is a very cost effective option. </li>
        <li>Ceramic Magnet has high coercive force that can offer good resistance to external demagnetization fields.</li>
        <li>Ceramic Magnet can not be rust on their surface, they have been oixde.</li>
        <li>Ceramic magnet commonly used in motors, speakers and work holding assemblies </li>
      </ul>

Typical Magnetic Properties

TYPICAL MAGNETIC PROPETIES OF CERAMIC MAGNET-PERMANENT FERRITE MAGNET
(US STANDARD)
GradeResidual induction(Br)Coercive Force(Hcb)Coercive Force(Hcj)(BH)maxMax operating Temp.
Br:Residual induction /Hcb:Coersive Force /Hcj:intrinsic Coersive Force /(BH)max:Max Energy Product
 kGs(mT)kA/m(kOe)kA/m(kOe)kJ/M3(MGOe)°C
Ceramic 12.3(230)148(1.86)278(3.5)8.4(1.05)250
Ceramic 53.9(390)200(2.4)198(2.5)27.6(3.4)250
Ceramic 73.4(340)260(3.25)320(4.0)21.9(2.75)250
Ceramic 83.9(390)240(3.0)256(3.2)27.6(3.4)250
Ceramic 8b4.0(400)240(3.0)244(3.05)30.4(3.8)250
TYPICAL MAGNETIC PROPETIES OF CERAMIC MAGNET-FERRITE MAGNET
(CN STANDARD)
GradeResidual induction(Br)Coercive Force(Hcb)Coercive Force(Hcj)(BH)maxMax operating Temp.
Br:Residual induction /Hcb:Coersive Force /Hcj:intrinsic Coersive Force /(BH)max:Max Energy Product
 kGs(mT)kA/m(kOe)kA/m(kOe)kJ/M3(MGOe)°C
Y8T 200~235(2.0~2.35) 125-160(1.57-2.01) 210-280(2.64-3.51 ) 6.5-9.5 (0.8-1.2 )250
Y22H 310~360 (3.10~3.60) 220-250 (2.76-3.14 ) 280-320 (3.51-4.02 ) 20.0-24.0 (2.5-3.0 )250
Y25 360~400 (3.60~4.00) 135-170 (1.70-2.14 ) 140-200 (1.76-2.51 ) 22.5-28.0 (2.8-3.5 )250
Y26H-1 360~390 (3.60~3.90) 200-250 (2.51-3.14 ) 225-255 (2.83-3.20 ) 23.0-28.0 (2.9-3.5 )250
Y26H-2 360~380 (3.60~3.80) 263-288 (3.30-3.62 ) 318-350 (3.99-4.40 ) 24.0-28.0 (3.0-3.5 )250
Y27H 350~380 (3.50~3.80) 225-240 (2.83-3.01 ) 235-260 (2.95-3.27 ) 25.0-29.0 (3.1-3.6 )250
Y28 370~400 (3.70~4.00) 175-210 (2.20-3.64 ) 180-220 (2.26-2.76 ) 26.0-30.0 (3.3-3.8 )250
Y28H-1 380~400 (3.80~4.00) 240-260 (3.01-3.27 ) 250-280 (3.14-3.52 ) 27.0-30.0 (3.4-3.8 )250
Y28H-2 360~380 (3.60~3.80) 271-295 (3.40-3.70 ) 382-405 (4.80-5.08 ) 26.0-30.0 (3.3-3.8 )250
Y30H-1 380~400 (3.80~4.00) 230-275 (2.89-3.46 ) 235-290 (2.95-3.64 ) 27.0-32.5 (3.4-4.1 )250
Y30H-2 395~415 (3.95~4.15) 275-300 (3.45-3.77 ) 310-335 (3.89-4.20 ) 27.0-32.0 (3.4-4.0 )250
Y32 400~420 (4.00~4.20) 160-190 (2.01-2.39 ) 165-195 (2.07-2.45 ) 30.0-33.5 (3.8-4.2 )250
Y32H-1 400~420 (4.00~4.20) 190-230 (2.39-2.89 ) 230-250 (2.89-3.14 ) 31.5-35.0 (3.9-4.4 )250
Y32H-2 400~440 (4.00~4.40) 224-240 (2.81-3.01 ) 230-250 (2.89-3.14 ) 31.0-34.0 (3.9-4.3 )250
Y33 410~430 (4.10~4.30) 220-250 (2.76-3.14 ) 225-255 (2.83-3.20 ) 31.5-35.0 (3.9-4.4 )250
Y33H 410~430 (4.10~4.30) 250-270 (3.14-3.39 ) 250-275 (3.14-3.45 ) 31.5-35.0 (3.9-4.4 )250
Y34 420~440 (4.20~4.40) 200-230 (2.51-2.89 ) 205-235 (2.57-2.95 ) 32.5-36.0 (4.1-4.4 )250
Y35 430~450 (4.30~4.50) 215-239 (2.70-3.00 ) 217-241 ( 2.73-3.03 ) 33.1-38.2 (4.1-4.8 )250
Y36 430~450 (4.30~4.50) 247-271 (3.10-3.40 ) 250-274 (3.14-3.44 ) 35.1-38.3 (4.4-4.8 )250
Y38 440~460 (4.40~4.60) 285-305 (3.58-3.83 ) 294-310 (3.69-3.89 ) 36.6-40.6 (4.6-5.1 )250
Y40 440~460 (4.40~4.60) 330-354 (4.15-4.45 ) 340-360 (4.27-4.52 ) 37.6-41.8 (4.7-5.2 )250
Samarium Cobalt Magnets – Physical Properties
PropertyUnitValue Ceramic (Strontium Ferrite)
The listed values are approximate and should be used as a reference.  Any magnetic or physical characteristics should be substantiated before selecting a magnet material. 
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 StrengthMpa0.05 – 0.09
Tensile StrengthMpa.02 to .05
Thermal Expansion Parallel (∥)
to Orientation (M)
°C-1+11.0 to +16.0 x10-6
Thermal Expansion
Perpendicular (⊥) to Orientation (M)
°C-1‘+7.0 to +15.0 x 10-6
Reversible Temperature Coefficient for Br (α)
Temperature Range 
(°C)
Induction Br (α) SmCo 1-5
(%)/°C
Induction Br (α) SmCo 2-17
(%)/°C
α = Δ Br / Δ T * 100 (Br @ 20°C) [ΔT = Relevant ranges listed above.]
20°C to 150°C-0.2 to -0.3-0.2 to -0.5