PTC Ni-Fe Alloy NF20 Wire Widely Used in Electronics Aerospace and Automotive Industries for its Exceptional Performance, Resistivity 0.20
NF20 PTC Ni-Fe Alloy (Ni 70%-75%) is a nickel-iron alloy known for its Positive Temperature Coefficient (PTC) behavior, where electrical resistivity increases with rising temperature. This property makes it suitable for applications in temperature sensing, overcurrent protection, and self-regulating heating systems.
The alloy features high magnetic permeability and low coercivity, making it ideal for soft magnetic applications such as transformers, inductors, and magnetic shielding. Its high electrical resistivity minimizes energy losses, while its thermal stability ensures reliable performance across a broad temperature range.
With its balanced nickel content, NF20 offers enhanced corrosion resistance, durability, and long-lasting performance in demanding environments. Its ductility and machinability allow for easy fabrication into wires, strips, and other forms for industrial and electronic applications.
NF20 is widely used in temperature-sensitive devices, magnetic components, automotive electronics, industrial heating systems, and consumer electronics. Its combination of thermal stability, magnetic efficiency, and corrosion resistance makes it a versatile material for diverse applications requiring precision and reliability.
| Main Chemical Composition Wt.% NF20 PTC Ni-Fe Alloy | % | Ni | Fe |
| Min | 70 | |
| Max | 75 | Bal. |
Some key features of PTC Ni-Fe alloy NF20 include:
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Positive Temperature Coefficient (PTC):
- Exhibits increased electrical resistivity with rising temperature, making it ideal for temperature sensing, current regulation, and circuit protection applications.
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Magnetic Properties:
- High magnetic permeability and low coercivity enable efficient performance in soft magnetic applications such as transformers, inductors, and magnetic cores.
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High Electrical Resistivity:
- Minimizes energy losses in magnetic circuits and enhances the efficiency of electronic systems.
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Thermal Stability:
- Provides reliable performance across a wide temperature range, ensuring stable electrical and magnetic properties.
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Corrosion Resistance:
- The nickel content offers enhanced resistance to oxidation and corrosion, extending the material’s lifespan in harsh environments.
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Mechanical Versatility:
- Good ductility and machinability allow the alloy to be processed into various forms, including wires, strips, and custom shapes, for diverse applications.
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Wide Application Range:
- Used in temperature-sensitive devices, overcurrent protection systems, magnetic shielding, heating elements, and precision electronic components.
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Durability and Reliability:
- Combines thermal, magnetic, and resistive stability with long-lasting performance for industrial, automotive, and electronic applications.
NF20’s balance of nickel content, thermal stability, and magnetic efficiency makes it a versatile and reliable alloy for applications requiring precision and durability.
Applications of PTC Ni-Fe alloy NF20 include:
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Temperature Sensing and Control:
- Used in thermistors and temperature-sensitive resistors for accurate temperature monitoring and regulation in industrial, automotive, and electronic systems.
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Overcurrent Protection:
- Functions as a current limiter by increasing resistance with rising temperature, protecting sensitive electronic components from damage due to overcurrent.
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Magnetic Cores:
- Ideal for use in soft magnetic cores for transformers, inductors, and chokes, offering high permeability and efficient energy transfer with minimal losses.
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Magnetic Shielding:
- Provides shielding for sensitive electronic devices, protecting them from external magnetic interference in industrial and consumer applications.
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Industrial Heating Systems:
- Integrated into self-regulating heating elements for precise temperature control and energy-efficient operation in industrial and domestic settings.
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Automotive Electronics:
- Used in resistors, sensors, and protection devices within automotive systems, ensuring reliable operation under varying temperature conditions.
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Consumer Electronics:
- Found in household appliances for circuit protection and temperature regulation to prevent overheating or electrical faults.
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Power and Renewable Energy Systems:
- Utilized in magnetic and resistive components for inverters, converters, and other power electronics to ensure stability and efficiency.
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Precision Instrumentation:
- Applied in high-accuracy sensors, control devices, and other instruments requiring stable magnetic and resistive properties over a wide temperature range.
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Aerospace and Defense Applications:
- Suitable for use in high-performance systems where thermal stability, magnetic efficiency, and durability are critical.
NF20’s combination of PTC behavior, magnetic efficiency, and thermal stability makes it a versatile material for diverse applications requiring precision, reliability, and durability.
Resistance Values and Naming Conventions for PTC Ni-Fe Alloy Wires
| Alloy brand | 20℃ Resistivity | The tolerance range |
| NF13 | 0.13 | ±0.02 |
| NF15 | 0.15 | ±0.02 |
| NF20 | 0.20 | ±0.02 |
| NF23 | 0.23 | ±0.02 |
| NF25 | 0.25 | ±0.02 |
| NF32 | 0.32 | ±0.02 |
| NF36 | 0.36 | ±0.02 |
| NF38 | 0.38 | ±0.02 |
| NF40 | 0.40 | ±0.02 |
| NF43 | 0.43 | ±0.02 |
| NF46 | 0.46 | ±0.02 |
| NF52 | 0.52 | ±0.02 |
| NF60 | 0.60 | ±0.02 |
Chemical Composition of Different Models of PTC Ni-Fe Alloy Wire
| Alloy brand | Chemical element |
| Ni % | Fe % |
| NF13 | 85-95 | Rest |
| NF15 | 75-85 | Rest |
| NF20 | 70-75 | Rest |
| NF23 | 60-65 | Rest |
| NF25 | 60-65 | Rest |
| NF32 | 50-55 | Rest |
| NF36 | 50-55 | Rest |
| NF38 | 50-55 | Rest |
| NF40 | 50-55 | Rest |
| NF43 | 45-50 | Rest |
| NF46 | 45-50 | Rest |
| NF52 | 45-50 | Rest |
| NF60 | 45-50 | Rest |
Temperature Coefficients of Different Models of PTC Ni-Fe Alloy Wire
| Alloy brand | 120℃ Temperature coefficient PPM | The tolerance range PPM |
| NF13 | 4200 | ±300 |
| NF15 | 4400 | ±300 |
| NF20 | 4500 | ±300 |
| NF23 | 4800 | ±300 |
| NF25 | 4600 | ±300 |
| NF32 | 4200 | ±300 |
| NF36 | 3800 | ±300 |
| NF38 | 4000 | ±300 |
| NF40 | 3800 | ±300 |
| NF43 | 3400 | ±300 |
| NF46 | 3200 | ±300 |
| NF52 | 3000 | ±300 |
| NF60 | 2500 | ±300 |
Mechanical properties (tensile strength)
| Category | Diameter range
mm | Elongation rate
≥ % |
| Cold drawn wire | 0.05 ＞ d ＜ 0.1 | ≥ 18 |
| 0.1 ＞ d ＜ 0.3 | ≥ 20 |
| 0.3 ＞ d ＜ 0.5 | ≥ 20 |
| 0.5 ＞ d ＜ 1.0 | ≥ 20 |
Size (diameter)
| Alloy Code | Diameter mm |
| Wire | Rod | Wire rod |
| NF13 | 0.05-8.0 | 12-30 | 8-14 |
| NF15 | 0.05-8.0 | 12-30 | 8-14 |
| NF20 | 0.05-8.0 | 12-30 | 8-14 |
| NF23 | 0.05-8.0 | 12-30 | 8-14 |
| NF25 | 0.05-8.0 | 12-30 | 8-14 |
| NF32 | 0.05-8.0 | 12-30 | 8-14 |
| NF36 | 0.05-8.0 | 12-30 | 8-14 |
| NF38 | 0.05-8.0 | 12-30 | 8-14 |
| NF40 | 0.05-8.0 | 12-30 | 8-14 |
| NF43 | 0.05-8.0 | 12-30 | 8-14 |
| NF46 | 0.05-8.0 | 12-30 | 8-14 |
| NF52 | 0.05-8.0 | 12-30 | 8-14 |
| NF60 | 0.05-8.0 | 12-30 | 8-14 |
Support and Services:
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4. Warranty and After-Sales Support
Q&A:
1. What is the minimum order quantity?
The MOQ is 5kg, but if you need samples, please contact us.
2. What are the terms of payment?
We support T/T or D/P, but sometimes it depends on the order volume and the way of trade.
3. What are your service hours?
We will respond within 24 hours of receiving a message, whether on weekdays or holidays.
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NF20 PTC Ni-Fe Alloy Wire with Positive Temperature Coefficient for Electronics Aerospace and Automotive Images
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