MgB2 Sintered Body Joint for Superconducting Wire
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Solution Overview
Problem
Existing techniques for joining superconducting wires, particularly multi-core wires, face challenges in maintaining high critical current properties without damaging filaments, as they react with MgB2 sintered bodies and require chemical polishing, which can lead to impurity issues and filament damage.
Innovation Solution
A method involving a dual sintered body approach, where a first MgB2 sintered body mechanically fixes filaments before joint formation, preventing damage and ensuring high critical current properties by using a separate MgB2 sintered body for electrical joining, and a second denser MgB2 sintered body for improved contact and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filaments are exposed by chemical polishing to enable MgB2 sintered body jointing, then electrical joint capability is improved, but filaments are damaged and critical current property deteriorates
Solution Approach 1:
The joint structure is divided into two distinct MgB2 sintered bodies: a first MgB2 sintered body that mechanically fixes the filaments without requiring chemical polishing, and a second MgB2 sintered body that provides the electrical joint interface. This segmentation allows the filaments to be secured mechanically while maintaining their integrity for electrical connection.
Solution Approach 2:
The first MgB2 sintered body performs preliminary mechanical fixation of the filaments before the electrical jointing process. This preliminary action secures the filaments in position and protects them from damage during subsequent processing, eliminating the need for chemical polishing that would otherwise damage the filaments.
2Stability of the object's composition
If heat-resistant adhesive is used to fix filaments, then filament positioning is improved, but impurities remain in the MgB2 sintered body and critical current property deteriorates
Solution Approach 1:
The adhesive material is completely removed (taken out) from the joint structure. Instead of using heat-resistant adhesive to fix filaments, the invention uses a first MgB2 sintered body that mechanically secures the filaments without any adhesive, thereby eliminating impurity contamination and preserving critical current properties.
Solution Approach 2:
The joint structure uses homogeneous MgB2 material for both mechanical fixation and electrical connection. The first MgB2 sintered body and second MgB2 sintered body are made of the same material, ensuring uniform properties throughout the joint without introducing foreign impurities like adhesive residues.
3Device complexity
If single MgB2 sintered body is used for both mechanical fixation and electrical jointing, then device complexity is reduced, but filament damage occurs and critical current property deteriorates
Solution Approach 1:
The joint structure is segmented into two functional MgB2 sintered bodies: the first MgB2 sintered body dedicated to mechanical fixation of filaments, and the second MgB2 sintered body dedicated to electrical jointing. This functional segmentation allows each component to optimize its specific role without compromising filament integrity or electrical performance.
Solution Approach 2:
Different regions of the joint structure have specialized local qualities: the first MgB2 sintered body has mechanical fixation properties optimized for securing filaments, while the second MgB2 sintered body has electrical contact properties optimized for low-resistance jointing. This local quality differentiation ensures both mechanical stability and electrical performance.
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 method enables the attainment of high critical current properties in multi-core wire joints without damaging the filaments, enhancing the reliability and stability of superconducting magnets for persistent current operations.
Implementation Method 1
a first MgB2 sintered body that mechanically fixes filaments
Implementation Method 2
a second MgB2 sintered body that contributes to an electric joint
Data Source
AI summary
The problem is to attain a joint for multi-core superconducting wires having a high critical current property. The joint for superconducting wires of the present invention has a first sintered body containing MgB2 configured to fix a plurality of superconducting wires, and a second sintered body containing MgB2 configured to joint the superconducting wires.