Ni79Mo4 Transformer Core Soft Magnetic Alloy E11c Ni 75-79%
Chemical
OhmAlloy-1J79 (Soft magnetic alloy)(Common Name: Ni79Mo4,E11c,
malloy, permalloy, 79HM)
Ohmalloy-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 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.
Ohmalloy-1J79 widely used in radio-electronic industry, precision instruments,
remote control and automatic control system.
Normal composition%
| Ni | 78.5~80.0 | Fe | Bal. | Mn | 0.6~1.1 | Si | 0.3~0.5 |
| Mo | 3.8~4.1 | Cu | ≤0.2 | | | | |
| C | ≤0.03 | P | ≤0.02 | S | ≤0.02 | | |
Typical Mechanical properties
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 980 | 1030 | 3~50 |
Typical Physical properties
| Density (g/cm3) | 8.6 |
| Electrical resistivity at 20℃(Ωmm2/m) | 0.55 |
| Coefficient of linear expansion(20℃~200℃)X10-6/℃ | 10.3~11.5 |
| Saturation magnetostriction coefficient λθ/ 10-6 | 2.0 |
| Curie point Tc/ ℃ | 450 |
The magnetic properties of alloys with high permeability in weak
fields |
| 1J79 | 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 1J79 |
| Annealing media | Vacuum with a residual pressure not higher than 0.1Pa, hydrogen
with a dew point of not higher than minus 40 ℃. |
| The heating temperature and rate | 1100~1150℃ |
| Holding time | 3~6 |
| Cooling rate | With 100 ~ 200 ℃/ h cooled to 600 ℃, rapidly cooled to 300℃ |
Style of supply
| Alloys Name | Type | Dimension |
| OhmAlloy-1J79 | Wire | D= 0.1~8mm |
| OhmAlloy-1J79 | Strip | W= 8~390mm | T= 0.3mm |
| OhmAlloy-1J79 | Foil | W= 10~100mm | T= 0.01~0.1 |
| OhmAlloy-1J79 | Bar | Dia= 8~100mm | L= 50~1000 |
Sales Manager:Michaeal Qiu.
What's App:+86 13795230939
Tel:+86-21-66796338 Mobile Phone: +86 13795230939
