Low-Temperature Superconducting Wire with MIT Sheath for Quench Protection
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Solution Overview
Problem
High stabilizing matrix ratios in low-temperature superconducting wires reduce current density and increase manufacturing costs, while also failing to provide adequate self-protection against quench phenomena in superconducting magnets.
Innovation Solution
Incorporating a Metal-Insulator Transition (MIT) material with a transition temperature of room temperature or lower, such as vanadium oxide, as a sheath around the stabilizing matrix, which acts as a conductive path during quench events, allowing for a lower stabilizing matrix ratio and enhanced current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high stabilizing matrix ratio is used to protect the wire from quench, then reliability is improved, but current density decreases and manufacturing cost increases
Solution Approach 1:
The patent changes the physical state of the stabilizing matrix from solid to liquid by using a eutectic alloy with melting point below the operating temperature. This parameter change allows the matrix to provide effective thermal conduction for quench protection while reducing its volume fraction, thereby increasing current density without compromising reliability
Solution Approach 2:
The patent employs a composite structure consisting of superconducting filaments embedded in a eutectic alloy matrix. The composite nature allows optimization of each component's properties - the superconducting material provides zero-resistance current conduction while the liquid eutectic matrix provides thermal stability and quench protection with minimal volume occupation
2Reliability
If a high stabilizing matrix ratio is used to protect the wire from quench, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
By changing the stabilizing matrix to a liquid eutectic alloy with lower melting point, the patent reduces the amount of matrix material needed (from 7:1 ratio to much lower ratios), directly reducing material costs and simplifying the manufacturing process while maintaining quench protection functionality
Solution Approach 2:
The patent utilizes the phase transition property of the eutectic alloy, which remains liquid at operating temperatures but can solidify upon cooling. This phase transition capability allows the matrix to provide effective thermal management during quench events while occupying minimal space, reducing both material quantity and manufacturing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces manufacturing costs and achieves a high current density while providing self-protection against quench phenomena by utilizing the MIT material's conductive properties at elevated temperatures.
Implementation Method 1
a sheath of a Metal-Insulator Transition (MIT) material, which encompasses the stabilizing matrix on the exterior of the stabilizing matrix. In the present invention, the MIT material has a transition temperature of a room temperature or lower
Data Source
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AI summary
Provided is a low-temperature superconducting wire having a low stabilizing matrix ratio. The present invention provides a superconducting wire including: a low-temperature superconducting filament; a stabilizing matrix encompassing the filament; and a sheath of a Metal-Insulator Transition (MIT) material, which encompasses the stabilizing matrix on the exterior of the stabilizing matrix. According to the present invention, a low stabilizing matrix ratio is achieved while coping with heat caused by a quench phenomenon, thereby reducing manufacturing cost and achieving a high current density.