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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
Karma Ni-Cr-Al-Fe Precision Resistance Alloy Foil
The Karma Ni-Cr-Al-Fe precision resistance alloy foil is an advanced thin-gauge material engineered for high-stability strain gauge sensors, precision resistors, and load cell transducers. Manufactured through a controlled cold-rolling process with bright annealing treatment, this foil delivers consistent electrical resistivity and a low temperature coefficient of resistance (TCR), ensuring accurate and repeatable measurements across a wide operating temperature range.
Alloy Composition and Microstructure
Karma alloy belongs to the nickel-chromium-aluminum-iron family, with a nominal composition of Ni 73-75%, Cr 19-21%, Al 2-3%, and Fe as the balance. The controlled addition of aluminum enhances oxidation resistance and refines the grain structure during annealing, resulting in superior mechanical strength and thermal stability. Each production batch undergoes vacuum induction melting (VIM) to minimize impurities and ensure uniform chemical distribution throughout the foil matrix.
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
All Karma alloy foils are supplied with a bright, oxide-free surface finish achieved through controlled-atmosphere bright annealing. The cold-rolled surface exhibits a uniform matte-satin appearance with Ra ≤0.4 μm surface roughness. Edge condition is precision slit with minimal burr height (≤5% of foil thickness), suitable for direct photolithographic patterning in strain gauge manufacturing processes.
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 across the full temperature range, tensile testing per ASTM E8, and surface profilometry. Material certificates with traceable batch numbers are provided with every shipment. Our facility is ISO 9001:2015 certified and all products comply with RoHS directive requirements.
Packaging and Shipment
Foil rolls are individually vacuum-sealed in anti-static barrier bags with desiccant packs to prevent oxidation during storage and transit. Each roll is wound on a rigid plastic core and cushioned with polyethylene foam. Outer packaging consists of reinforced export-grade wooden crates with moisture-proof lining. Custom labeling, private label, and neutral packaging options are available upon request.
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