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Soft Magnetic Alloy Wire Ni77mo4cu5

Short Description:

(Soft magnetic alloy)

Ni77mo4cu5 is a nickel-iron magnetic alloy, with about 80% nickel and 20% iron content. Invented in 1914 by physicist Gustav Elmen at Bell Telephone Laboratories, it is notable for its very high magnetic permeability, which makes it useful as a magnetic core material in electrical and electronic equipment, and also in magnetic shielding to block magnetic fields. Commercial permalloy alloys typically have relative permeability of around 100,000, compared to several thousand for ordinary steel.
In addition to high permeability, its other magnetic properties are low coercivity, near zero magnetostriction, and significant anisotropic magnetoresistance. The low magnetostriction is critical for industrial applications, allowing it to be used in thin films where variable stresses would otherwise cause a ruinously large variation in magnetic properties. Permalloy's electrical resistivity can vary as much as 5% depending on the strength and the direction of an applied magnetic field. Permalloys typically have the face centered cubic crystal structure with a lattice constant of approximately 0.355 nm in the vicinity of a nickel concentration of 80%. A disadvantage of permalloy is that it is not very ductile or workable, so applications requiring elaborate shapes, such as magnetic shields, are made of other high permeability alloys such as mu metal. Permalloy is used in transformer laminations and magnetic recording heads.
Ni77mo4cu5 widely used in radio-electronic industry, precision instruments, remote control and automatic control system.


  • Model NO.: Ni77mo4cu5
  • Status: Bright
  • Resistivity: 0.55
  • Coefficient of linear expansion(20ºC~200ºC)X10-6/ºC : 25
  • Density (g/cm3): 8.6
  • Curie point Tc/ ºC: 350
  • Origin: China
  • Product Detail

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    Product Tags

    Normal composition%

    Ni 75.5~78 Fe Bal. Mn 0.3~0.6 Si 0.15~0.3
    Mo 3.9~4.5 Cu 4.8~6.0
    C ≤0.03 P ≤0.02 S ≤0.02

    Typical Mechanical properties

    Yield strength Tensile Strength Elongation
    Mpa Mpa %
    980 980 2~40

    Typical Physical properties

    Density (g/cm3) 8.6
    Electrical resistivity at 20ºC(Om*mm2/m) 0.55
    Coefficient of linear expansion(20ºC~200ºC)X10-6/ºC 10.3~11.5
    Saturation magnetostriction coefficient λθ/ 10-6 2.4
    Curie point   Tc/ ºC 350

     

    The magnetic properties of alloys with high permeability in weak fields
    1J77 Initial permeability Maximum permeability Coercivity Saturation magnetic induction intensity
    Сold-rolled strip/ sheet.
    Thickness, mm
    μ0.08/ (mH/m) μm/ (mH/m) Hc/ (A/m) BS/ T
    0.01 mm 17.5 87.5 5.6 0.75
    0.1~0.19 mm 25.0 162.5 2.4
    0.2~0.34 mm 28.0 225.0 1.6
    0.35~1.0 mm 30.0 250.0 1.6
    1.1~2.5 mm 27.5 225.0 1.6
    2.6~3.0 mm 26.3 187.5 2.0
    cold drawn wire
    0.1 mm 6.3 50 6.4
    Bar
    8-100 mm 25 100 3.2

     

    Mode of heat treatment
    Annealing media Vacuum with a residual pressure not higher than 0.1Pa, hydrogen with a dew point of not higher than minus 40 ºC.
    The heating temperature and rate 1100~1150ºC
    Holding time 3~6
    Cooling rate With 100 ~ 200 ºC/ h cooled to 600 ºC, rapidly cooled to 300ºC

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