Nickel-Chromium-Aluminum-Iron Alloy Cable for High-Temperature Sensors
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Solution Overview
Problem
Conventional mineral-insulated cables for temperature sensors have limited temperature resistance, up to 950°C, and exhibit corrosion leading to changes in electrical contact resistance over time, making them unsuitable for high-temperature applications like turbocharged internal combustion engines.
Innovation Solution
A cable comprising a nickel-chromium-aluminum-iron alloy with specific weight percentages of chromium, aluminum, iron, and nickel, along with other elements, is developed, providing enhanced temperature resistance, corrosion resistance, and ease of production, allowing for stable electrical contacts even at temperatures above 950°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional mineral-insulated cables are used, then the cable can be produced with existing materials and methods, but the temperature resistance is limited to 950°C and corrosion resistance is poor
Solution Approach 1:
The patent applies composite materials by combining nickel-chromium-aluminum-iron alloy with mineral insulation material. The alloy sheath provides both high temperature resistance (withstanding temperatures above 950°C) and corrosion resistance, while the mineral insulation maintains electrical properties. This composite structure resolves the contradiction by selecting materials whose properties complement each other to achieve both thermal stability and corrosion protection simultaneously.
Solution Approach 2:
The patent changes the material parameters by specifying precise compositional ranges: nickel (balance), chromium (25.0-28.0% by weight), aluminum (2.0-3.0% by weight), and iron (1.0-11.0% by weight). These parameter changes in the alloy composition enable the sheath to withstand temperatures above 950°C while maintaining corrosion resistance, directly resolving the limitation of conventional cables.
2Duration of action of stationary object
If conventional mineral-insulated cables are used, then the production process is established and simple, but the electrical contact resistance changes over time due to corrosion
Solution Approach 1:
The nickel-chromium-aluminum-iron alloy combined with mineral insulation creates a composite cable structure where the alloy sheath protects against corrosion, ensuring stable electrical contact resistance over time. The mineral insulation layer maintains electrical properties while the corrosion-resistant sheath prevents degradation, together extending service life and maintaining reliability.
Solution Approach 2:
The patent uses a cost-effective alloy composition that balances performance and manufacturability. By selecting readily available elements (nickel, chromium, aluminum, iron) in specific proportions, the cable achieves long service life without requiring expensive exotic materials, making the solution economically viable for extended applications.
3Temperature
If the cable is designed for high temperature resistance above 950°C, then temperature stability is improved, but production complexity increases
Solution Approach 1:
The patent specifies precise compositional parameters (nickel: balance, chromium: 25.0-28.0%, aluminum: 2.0-3.0%, iron: 1.0-11.0%) that enable high temperature resistance above 950°C. These parameter changes are implemented through standard metallurgical processes, maintaining ease of manufacture while achieving the required thermal performance.
Solution Approach 2:
The alloy composition is optimized locally at the sheath-material interface where temperature and corrosion resistance are critical. The specific combination of chromium (for oxidation resistance), aluminum (for heat resistance), and nickel (for ductility and corrosion resistance) creates local quality enhancement at the critical surface without requiring complex overall structural changes.
4Reliability
If a nickel-chromium-aluminum-iron alloy is used, then temperature resistance and corrosion resistance are improved, but material cost increases
Solution Approach 1:
The patent optimizes the alloy composition parameters to balance performance and cost. By specifying chromium at 25.0-28.0% (providing corrosion resistance), aluminum at 2.0-3.0% (providing heat resistance), and iron at 1.0-11.0% (providing structural integrity), the formulation achieves high reliability while using cost-effective base materials rather than expensive exotic alloys.
Solution Approach 2:
The composite structure of nickel-chromium-aluminum-iron alloy with mineral insulation distributes the cost across different functional layers. The alloy sheath provides corrosion and heat resistance, while the mineral insulation provides electrical properties, allowing each material to be optimized for its specific function at an economical cost.
Data Source
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AI summary
The invention relates to a cable (81) for contacting a sensor (70), in particular a temperature sensor, comprising a cover (82), a dielectric (83) and at least one conductor (84, 84'), the at least one conductor (84, 84') is arranged in the cover (82), such that the conductor (84, 84') is spatially separated from the cover (82) using the dielectric (83), wherein the at least one conductor (84, 84') and/or the cover (82) is/are made from a nickel-chromium-aluminum-iron alloy, said alloy comprising 10.0 - 30.0 wt.% chromium (Cr), 0.5 - 5.0 wt.% aluminium (AI), 0.5 - 15.0 wt.% iron (Fe), and 50.0 - 89.0 wt.% nickel (Ni).