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Sintered Magnets
Generals
Ferrite magnets are composed essentially of oxide materials manufactured under a powder metallurgical process. Their magnetic properties feature a relatively low residual flux density, coupled with a high coercive force.
The feature of a low recoil permeability, along with the high coercive force, makes them highly resistant to demagnetizing fields. In addition, their relatively low specific density and economical cost are also very attractive to the magnet designers. When designing the ferrite magnets for a particular application, primary consideration should be given to its shape limitation due to the powder metallurgical manufacturing process and to the temperature dependence of ferrite materials.
Since the magnetic characteristics of ferrite magnets are relatively sensitive to changes in temperature, adequate consideration should be made regarding the application purpose
Physical Properties
Item Unit Pmf-2~7 Series Pmf-9 Series Pmf-9 Series*3 Relative Recoil Permeability 1.05 ~ 1.10 1.05 ~ 1.10 1.05 ~ 1.10 Temp. Coeff. (△Br/Br) %/℃ 0.20 ~ - 0.18 0.20 ~ - 0.18 - 0.20 ~ - 0.18 (△Hcj.hcj) 0.3 ~ 0.4 0.16 ~ 0.35 0.13 ~ 0.16 Specific Heat (C) J/㎏•℃ 630 ~ 840 630 ~ 840 630 ~ 840 Termal
Expansion Coeff.(C//)*1 10-6 / ℃ 14 ~ 15 14 ~ 15 14 ~ 15 (Cㅗ)*2 9 ~ 10 9 ~ 10 8 ~ 9 Thermal
conductivity(C//)*1 W/m•℃ ~ 5.8 ~ 5.8 ~ 5.8 (Cㅗ)*2 Flectional Strength Mpa 50 ~ 100 50 ~ 100 50 ~ 100 Young's Modulus (E) Mpa 1.5×105 1.5×105 1.5×105 Poisson's Ratio 0.2 ~ 0.3 0.2 ~ 0.3 0.2 ~ 0.3 Density (ρ) ㎏/㎥×10*3 4.8 ~ 5.0 4.9 ~ 5.1 5.0 ~ 5.2 Curie Temperature (Tc) ℃ 450 ~ 460 437 416 Magnetic Characteristics
추후 반영 예정-
Demagnetic Characteristics
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Br & iHc Relationship
추후 반영 예정
