1J85 Soft Magnetic Alloy
1J85 is a type of nickel-based soft magnetic alloy, also known as Permalloy. It has an extremely high magnetic permeability, allowing it to be magnetized in relatively weak magnetic fields while achieving high magnetic induction. Additionally, it quickly reaches saturation. Below its Curie temperature of 400°C, 1J85 exhibits excellent ferromagnetic properties, making it an ideal magnetic material at lower temperatures.
Table of Contents
Standard Dimensions of 1J85 Soft Magnetic Alloy in Various Forms
| Form | Thickness/Diameter | Width | Length | Additional Notes |
|---|---|---|---|---|
| Sheet/Strip | 0.05 mm – 2.0 mm | 10 mm – 400 mm | Coils or custom lengths | Used in transformers and magnetic shielding |
| Wire | 0.05 mm – 5.0 mm | – | Custom lengths | Ideal for electromagnetic coils and precision sensors |
| Rod/Bar | 5 mm – 100 mm | – | 1 m – 6 m | Suitable for motors, solenoid valves, and magnetic circuits |
| Foil | 0.02 mm – 0.1 mm | 10 mm – 300 mm | Rolls | For precision applications requiring thin layers |
| Tube | Outer diameter 10 mm – 50 mm | Wall thickness 0.5 mm – 5 mm | Custom lengths | Used in specialized electromagnetic and shielding applications |
Chemical composition of 1J85
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 79.0 – 81.0 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 4.8 – 5.2 |
| Manganese (Mn) | ≤ 0.3 |
| Silicon (Si) | ≤ 0.3 |
| Carbon (C) | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.02 |
Corresponding and Similar Grades to 1J85 Soft Magnetic Alloy
| Grade | Country | Notes |
|---|---|---|
| Permalloy | International | A widely used name for nickel-iron soft magnetic alloys |
| Ni80Mo5 | China | The Chinese equivalent for 1J85 with similar composition |
| Alloy 79 | USA | American equivalent used for similar soft magnetic properties |
| Supermalloy | USA | A high-permeability variant of 1J85 commonly used in the US |
| 79HM | Russia | Russian designation for this type of high-permeability alloy |
| Magnifer 7904 | Germany | German equivalent known for precision magnetic applications |
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1J85 Applications
1J85 is widely used in various industries due to its magnetic properties and responsiveness to weak signals. Key applications include:
Core Lamination: Used in cores for DC relays, communication devices, and electronic equipment transformers and chokes.
Magnetic Shielding: Employed in shielding devices, components, or control elements to protect against unwanted magnetic interference.
Electronics and Precision Instruments: Applied in precision instrumentation, remote control, and automatic control systems.
High Sensitivity Transformers: Utilized in low-power magnetic amplifiers, small transformers, relays, choke coils, magnetic heads for magnetic recording devices, and various types of laminated and wound cores.
1J85 Material Characteristics
1J85 is a soft magnetic nickel-iron alloy with 79-81% nickel content, exhibiting:
- High Initial Permeability: Greater than 30 mH/m
- High Maximum Permeability: Greater than 115 mH/m
- Low Coercivity: Less than 2.4 A/m
- Saturation Magnetic Induction: Greater than 0.78 Tesla
It is highly responsive to weak signals and can reach magnetic saturation quickly, making it ideal for high-sensitivity applications.
- Microstructure: 1J85 has an austenitic structure. Austenitic alloys have a crystalline structure where atoms are arranged in a face-centered cubic lattice, a typical formation during the metal crystallization process.
1J85 Physical Properties
- Density: 8.75 g/cm³
- Melting Point: 1395-1425°C
Conclusion
1J85 is a nickel-based soft magnetic alloy characterized by its high initial permeability, low coercivity, and high maximum permeability. It is highly sensitive to weak signals, which makes it particularly promising for applications in the telecommunications and instrumentation industries. Additionally, 1J85 can be processed into very thin metal strips, making it suitable for high-sensitivity components in weak magnetic fields, such as chokes, audio transformers, fast magnetic amplifiers, relays, magnetic shielding, and various cores. It also finds applications in the defense industry, including aerospace and nuclear sectors.
