MgB2 Superconducting Wire Structure for Uniform Core Deformation
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Solution Overview
Problem
Multifilamentary wires using MgB2 superconductors often experience uneven deformation during processing due to material and layout issues, leading to a decrease in superconducting properties and stability.
Innovation Solution
A superconducting wire rod design featuring a center material with a non-reactive outer surface, surrounded by monofilamentary wires with an MgB2 superconductor core coated in a non-reactive metal, and an outer shell with an inner non-reactive surface, preventing uneven deformation through consistent metal properties across layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Cu is disposed at the center of the multifilamentary wire, then the wire can be formed with a center material, but the wire is likely to be deformed due to deformation of soft Cu and area reduction of outer metal
Solution Approach 1:
The patent applies local quality by using different metal materials for different regions of the wire structure. Specifically, Fe or Nb is used for the center material and inner circumferential surface where dimensional stability is critical, while Cu can be used for the outer shell material where softness is acceptable. This regional differentiation resolves the contradiction by placing non-reactive, dimensionally stable metals only where needed to prevent deformation.
Solution Approach 2:
The patent employs composite materials by combining multiple metal materials (Fe, Nb, Cu, and their alloys) within a single wire structure. The composite construction allows the inner layers to use dimensionally stable Fe or Nb while the outer layers can use more ductile Cu, thus preventing uneven deformation while maintaining ease of manufacture through material optimization in different regions.
2Adaptability or versatility
If metal materials with different properties are used for center material and outer shell material, then the wire can be optimized for different functions, but uneven deformation occurs during wire processing
Solution Approach 1:
The patent implements local quality by strategically assigning metal materials with specific properties to specific locations. Fe or Nb with high dimensional stability is placed at the center and inner circumferential surfaces where shape stability is most critical, while materials with different properties can be used at the outer shell where they will not cause uneven deformation of the MgB2 core material.
Solution Approach 2:
The patent uses Fe or Nb as intermediary materials between the MgB2 core material and the outer shell. These intermediary layers with non-reactive properties and high dimensional stability prevent direct interaction between reactive materials and prevent stress transfer that would cause uneven deformation, thus maintaining shape stability while allowing material optimization throughout the structure.
3Manufacturing precision
If the same metal is used for all layers, then uneven deformation is prevented, but the wire cannot be optimized for specific functions in different regions
Solution Approach 1:
The patent applies local quality by using the same non-reactive metal (Fe or Nb) for the center material and inner circumferential surface where shape uniformity is critical, while allowing different metal materials to be used for the outer shell material and coating layers where functional optimization is possible. This resolves the contradiction by maintaining shape uniformity in critical regions while enabling functional optimization in non-critical regions.
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 design effectively prevents uneven deformation of the MgB2 core material, maintaining superconducting properties and stability by using the same metal for all critical surfaces, reducing the risk of area reduction and reaction with Cu.
Implementation Method 1
an MgB2 superconductor has a highest critical temperature (approximately 39K) as a metallic superconductor. Therefore, the MgB2 superconductor has a feature that the MgB2 superconductor can maintain a superconducting state without being cooled to a boiling point of helium of 4.2 K
Data Source
AI summary
Provided are: a superconducting wire rod in which the non-uniform deformation of the shape of an MgB2 core material has been controlled; a superconducting coil; a magnetic generator; and a method for producing a superconducting wire rod. A superconducting wire rod (100A) according to the present invention comprises: a center material (106) of which at least the outer circumferential surface is formed of a metal that does not react with Mg; a plurality of single-core wires (103) disposed around the center material (106), each of the single-core wires having an MgB2 superconductor core material (101) coated with a first coating material (102) made of a metal that does not react with Mg; and an outer shell material (105) disposed outside the plurality of single-core wires (103), wherein at least the inner circumferential surface of the outer shell material (105) is formed of a metal that does not react with Mg.