OhmAlloy-1J85 (Soft magnetic alloy)
(Common Name: Ni80Mo5, E11c, permalloy, 79HMA, PCS)
Ohmalloy-1J85 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-1J85idely used in radio-electronic industry, precision instruments, remote control
and automatic control system.
Normal composition%
| Ni | 79.0~81.0 | Fe | Bal. | Mn | 0.3~0.6 | Si | 0.15~0.3 |
| Mo | 4.8~5.2 | 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) | 8.75 |
| Electrical resistivity at 20℃(Ωmm2/m) | 0.56 |
| Coefficient of linear expansion(20℃~200℃)X10-6/℃ | 10.9~11.2 |
| Saturation magnetostriction coefficient λθ/ 10-6 | 0,5 |
| Curie point Tc/ ℃ | 400 |
The magnetic properties of alloys with high permeability in weak
fields |
| 1J85 | 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 | 20 | 87.5 | 4.8 |
0.75 |
| 0.1~0.19 mm | 37.5 | 187.5 | 1.6 |
| 0.2~0.34 mm | 50 | 225 | 1.2 |
| 0.35~1.0 mm | 62.5 | 312.5 | 0.8 |
| 1.1~2.5 mm | 50 | 187.5 | 1.2 |
| 2.6~3.0 mm | 43.8 | 150 | 1.44 |
| cold drawn wire | |
| 0.1 mm | 8.7 | 37.6 | 6.4 |
| Bar | |
| 8-100 mm | 37.5 | 125 | 1.6 |
| 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 | 1100~1200℃ |
| Holding time/h | 3~6 |
| Cooling rate | With 100 ~ 200 ℃/ h cooled to 500~600 ℃, not less than 400℃/h
cooled to 300℃ |
Style of supply
| Alloys Name | Type | Dimension |
| OhmAlloy-1J85 | Wire | D= 0.1~8mm |
| OhmAlloy-1J85 | Strip | W= 8~390mm | T= 0.3mm |
| OhmAlloy-1J85 | Foil | W= 10~100mm | T= 0.01~0.1 |
| OhmAlloy-1J85 | Bar | Dia= 8~100mm | L= 50~1000 |
Style of supply
| Alloys Name | Type | Dimension |
| OhmAlloy-1J85 | Wire | D= 0.1~8mm |
| OhmAlloy-1J85 | Strip | W= 8~390mm | T= 0.3mm |
| OhmAlloy-1J85 | Foil | W= 10~100mm | T= 0.01~0.1 |
| OhmAlloy-1J85 | Bar | Dia= 8~100mm | L= 50~1000 |
FAQ
1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you
want.
If we do not have, for spool wire, we can produce 1 spool, about
2-3kg. For coil wire, 25kg.
2. How can you pay for small sample amount?
We have account, wire transfer for sample amount also ok.
3. Customer do not have express account. How will we arrange the
delivery for sample order?
Just need to provide your address information, we will check the
express cost, you can arrange the express cost together with sample
value.
4. What's our payment terms?
We can accept LC T/T payment terms, it also depending on delivery
and total amount. Let's talk more in details after getting your
detailed requirements.
5. Do you provide free samples?
If you want several meters and we have stock of your size, we can
provide, customer need to bear the International express cost.
6.How do you guarantee the quality?
We have QC who are responsible for tracking and monitoring whole
production process, and we are willing to accept customer‘s
testing.
7. What's our working time?
We will give you reply through email/phone Online chat tool within
24 hours. No matter working day or holidays.
