Introduction
Permalloy magnetic alloy is of Fi-Ni alloy with a wide range of nickel contents from 35% to 90%. The biggest characteristic of this permalloy is the high magnetic permeability of weak magnetic field. And the saturation induction density is generally within 0.6-1.0T.
Type of supply
| Style | Size |
| Wire | D= 0.1~8mm | |
| Strip | W= 8~390mm | T= 0.3mm | |
| Foil | W= 10~100mm | T= 0.01~0.1mm | |
| Rod | Dia= 8~100mm | L= 50~1000mm | |
Application
Permalloy is mainly used in high magnetic conductivity yoke iron, sensitive relay, low loss micromotor, low power transformer, pulse transformer, transistor switch, magnetic amplifier, magnetic modulator, sensitive signal input and output transformer, magnetic sensor of aviation magnetic heading instrument, magnetic sensitive element of magnetic measuring instrument, stator and moving plate of precision electric meter, magnetic shielding and magnetic temperature compensating elements.
Chemical 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 |
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| C | ≤0.03 | P | ≤0.02 | S | ≤0.02 |
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Mechanical property
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 980 | 1030 | 3~50 |
Physical property
| Density (g/cm3) | 8.75 |
| Resistivity under 20℃(Ωmm2/m) | 0.56 |
| Linear expansion coefficient (20℃-200℃) X10-6/℃ | 10.9~11.2 |
| Saturation magnetostrictive coefficient, λθ/ 10-6 | 0,5 |
| Curie point, Tc/ ℃ | 400 |
Magnetic property
| 1J85 | Initial magnetic permeability | Max.magnetic permeability | Coercive force | Saturation induction intensity |
| Cold rolled strip/sheet material 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 |
| Hard drawn wire |
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| 0.1 mm | 8.7 | 37.6 | 6.4 |
| Bar |
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| 8-100 mm | 37.5 | 125 | 1.6 |
Heat treatment process
| Annealing medium | Dry hydrogen ( dew point is no more than -40℃) or vacuum, and the residual pressure is no more than 0.1Pa |
| Heating temperature and speed | 1100~1200℃ |
| Heat preservation (h) | 3~6 |
| Cooling speed | Be cooled to 600℃ at a speed of 100 ~ 200 ℃/ h, then be cooled to 300℃ at a speed of on less than 400℃/h, discharging from the furnace. |
Index
nickel iron alloy, alloy strip, alloy rod
