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Ni-Cr-Al-Fe Kama Precision Resistance Alloy Foil 0.002-0.05mm Thickness 5-200mm Width for Strain Gauge Applications
| Place of Origin | Shanghai, China |
|---|---|
| Brand Name | Huona |
| Certification | ISO 9001 |
| Model Number | Kama-Foil-010 |
| Minimum Order Quantity | 1 Roll |
| Price | Negotiable |
| Packaging Details | Vacuum-sealed anti-oxidation packaging with desiccant, reinforced wooden export crate with moisture-proof lining |
| Delivery Time | 5-7 working days for stock, 15-20 days for custom production |
| Payment Terms | T/T,L/C,PayPal,Western Union |
| Supply Ability | 2000 Rolls per Month |
Product Details
| Alloy Type | Ni-Cr-Al-Fe Precision Resistance Alloy (Kama) | Alloy Composition | Ni 73-75%, Cr 19-21%, Al 2-3%, Fe Balance |
|---|---|---|---|
| Foil Thickness Range | 0.002 Mm - 0.050 Mm (2-50 μm) | Foil Width Range | 5 Mm - 200 Mm |
| Resistivity At 20°C | 1.33 μΩ·m ±5% | Temperature Coefficient Of Resistance | ±10 To ±20 Ppm/°C (20-100°C) |
| Maximum Operating Temperature | 260°C | Tensile Strength | 800-1000 MPa |
| Density | 8.1 G/cm³ | Elongation | ≥15% |
| Surface Finish | Bright Annealed / Cold-Rolled | Supply Form | Roll / Coil / Sheet / Strip |
| Highlight | Low TCR Resistance Alloy Foil,Strain Gauge Sensor Element Material,Ni-Cr-Al-Fe Precision Foil Sheet |
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Product Description
Ni-Cr-Al-Fe Kama Precision Resistance Alloy Foil
Advanced thin-gauge material engineered for high-stability strain gauge sensors, precision resistors, and load cell transducers. Manufactured through controlled cold-rolling with bright annealing treatment for consistent electrical resistivity and low temperature coefficient of resistance (TCR).
Alloy Composition and Microstructure
Karma alloy belongs to the nickel-chromium-aluminum-iron family with nominal composition: Ni 73-75%, Cr 19-21%, Al 2-3%, and Fe as balance. Aluminum addition enhances oxidation resistance and refines grain structure. Produced via vacuum induction melting (VIM) for minimal impurities and uniform chemical distribution.
Electrical Performance
| Parameter | Typical Value |
|---|---|
| Resistivity at 20°C | 1.33 μΩ*m ±5% |
| TCR (20-100°C) | ±10 to ±20 ppm/°C |
| Thermal EMF vs. Copper | ≤2.5 μV/°C |
| Stability (1000h at 150°C) | ≤0.02% drift |
| Max Operating Temperature | 260°C |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 800-1000 MPa |
| Elongation | ≥15% |
| Density | 8.1 g/cm³ |
| Hardness (HV) | 200-280 |
Dimensional Specifications
| Parameter | Range |
|---|---|
| Foil Thickness | 0.002 mm - 0.050 mm (±5% tolerance) |
| Foil Width | 5 mm - 200 mm (±0.1 mm tolerance) |
| Roll Length | Customizable up to 500 meters per roll |
Surface Quality and Edge Condition
Bright, oxide-free surface finish achieved through controlled-atmosphere bright annealing. Uniform matte-satin appearance with Ra ≤0.4 μm surface roughness. Precision slit edges with minimal burr height (≤5% of foil thickness), suitable for direct photolithographic patterning.
Key Applications
- Strain Gauges: Primary sensing element for load cells, pressure transducers, torque sensors, and displacement measurement systems
- Precision Resistors: Bulk metal foil resistors, current-sense shunt resistors, and metrology-grade reference standards
- Aerospace Instrumentation: High-reliability sensors for flight control surfaces, engine monitoring, and structural health monitoring
- Industrial Weighing: Load cell foil for truck scales, platform scales, hopper weighing, and filling systems
- Medical Devices: Force-sensing elements in surgical robotics, infusion pumps, and patient monitoring equipment
Quality Assurance
Each production lot undergoes comprehensive electrical and mechanical testing including four-wire resistivity measurement, TCR characterization, tensile testing per ASTM E8, and surface profilometry. Material certificates with traceable batch numbers provided. ISO 9001:2015 certified facility with RoHS compliance.
Packaging and Shipment
Foil rolls individually vacuum-sealed in anti-static barrier bags with desiccant packs. Wound on rigid plastic cores with polyethylene foam cushioning. Outer packaging consists of reinforced export-grade wooden crates with moisture-proof lining. Custom labeling and packaging options available.
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