- Permalloy wire/FeNi Alloy wire /1J79 wire/ soft magnetic alloy/ precision alloy
1J79 (Soft magnetic alloy) precision alloy
(Common Name: Ni79Mo4, E11c, malloy, permalloy, 79HM)
precision alloy-1J79 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 precision alloy 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. precision alloyThe 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%. precision alloy 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 precision
alloy such as mu metal. Permalloy is used in transformer
laminations and magnetic recording heads.
precision alloy 1J79 widely used in radio-electronic industry, precision
instruments, remote control and automatic control system.
precision alloy precision alloy precision alloy
Chemical composition(%)
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | Fe |
| 1J79 | ≤0.03 | 0.3~0.5 | 0.6~1.1 | ≤0.02 | ≤0.02 | 78.5~80 | - | 3.8~4.1 | Bal. |
Physical properties
- Density (g/cm3): 8.6
- Curie point (℃): 450
- Electrical resistivity (μΩ*cm): 55 (20℃)
- Thermal conductivity ( W/m. ℃): 13.4
Magnetic properties
- Initial permeability μ0 (mH/m): ≥40
- Maximum permeability μm (mH/m): ≥310
- Coercivity Hc (A/m): ≤2.0
- Saturation magnetic induction Bs (T): 0.73
- Infrastructure such as bridges, trestles, water towers, wind
turbines, pipelines
- Marine and offshore applications, such as bridges, hulls for ships
and tankers, offshore wind turbines
- Corrosion Under Insulation (CUI)
- Boilers and Digesters
