Superconducting Wire Connection Structure for Low-Resistance Joints
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Solution Overview
Problem
Existing connection structures for superconducting wires in NMR and MRI devices face challenges in achieving low electric resistance and high mechanical strength, particularly in ensuring sufficient oxygen supply and desorption of carbon or organic substances during heat treatment, leading to inadequate electrical resistance and mechanical strength in the connection layer.
Innovation Solution
A connection structure featuring a superconducting wire configuration with wide and narrow regions and slits in the second and third superconducting members, where a slurry containing rare earth elements, barium, copper, and oxygen is applied between the superconducting layers, followed by heat treatments to form a connection layer with a perovskite structure, promoting oxide superconductor formation and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a connection structure is formed by connecting superconducting wires, then the superconducting wire length is extended, but the electric resistance increases and mechanical strength decreases
Solution Approach 1:
The connection structure is divided into multiple regions (wide region, first narrow region, second narrow region) with different functions. The wide region provides mechanical strength and oxygen supply, while the narrow regions reduce carbon residue and improve current characteristics, resolving the contradiction between connection length and electrical reliability
Solution Approach 2:
Different regions of the connection structure have different widths and functions. The wide region (first width) supplies oxygen and provides mechanical strength, while the narrow regions (second and third widths smaller than first width) reduce carbon residue and improve current flow, allowing each part to optimize for its specific function rather than using a uniform structure
2Reliability
If heat treatment is performed to form connection layer, then superconducting properties are achieved, but carbon or organic substances remain and mechanical strength is insufficient
Solution Approach 1:
The connection structure is segmented into regions with different widths that serve different purposes during heat treatment. The narrow regions (second and third regions with widths smaller than the first width) are specifically designed to facilitate carbon residue removal through enhanced oxygen supply and desorption pathways, while maintaining the superconducting properties in the wide region
Solution Approach 2:
The connection layer is formed with a structure that allows oxygen penetration and desorption pathways. The varying width regions create channels and pores that enable oxygen to reach and desorb carbon residues during heat treatment, while maintaining structural integrity and superconducting properties
3Reliability
If connection layer is formed with sufficient oxygen supply, then oxide superconductor formation is promoted, but manufacturing complexity increases
Solution Approach 1:
The connection structure uses local quality variation (different widths in different regions) to achieve oxygen supply optimization. The wide region provides abundant oxygen for oxide superconductor formation, while the narrow regions facilitate oxygen penetration and carbon desorption. This geometric variation is simpler to manufacture than complex oxygen delivery systems
Solution Approach 2:
The connection structure itself serves as the oxygen supply system. The varying width regions create internal channels and surfaces that naturally facilitate oxygen penetration and desorption during heat treatment, eliminating the need for external oxygen delivery mechanisms or complex manufacturing processes
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
The proposed connection structure achieves low electric resistance and high mechanical strength by ensuring sufficient oxygen supply and desorption, allowing for stable current flow and improved mechanical integrity, as evidenced by clear superconducting transitions and high critical current values.
Implementation Method 1
followed by heat treatments to form a connection layer with a perovskite structure, promoting oxide superconductor formation
Implementation Method 2
promoting oxide superconductor formation and enhancing mechanical strength
Implementation Method 3
followed by heat treatments to form a connection layer
Implementation Method 4
ensuring sufficient oxygen supply and desorption of carbon or organic substances during heat treatment
Implementation Method 5
allowing for stable current flow and improved mechanical integrity, as evidenced by clear superconducting transitions
Data Source
AI summary
A connection structure of a superconducting layer of an embodiment incudes a first superconducting member including a first superconducting layer, and extends in a first direction, a second superconducting member including a second superconducting layer facing the first superconducting layer, and extends in the first direction, the second superconducting member having a first region, a second region, and a third region which is separated in the second direction from the second region, and a connection layer that contains a rare earth element (RE), barium (Ba), copper (Cu), and oxygen (O), and connects the first superconducting layer and the second superconducting layer. The first superconducting layer is present in a third direction between the second region and the third region, the third direction being perpendicular to the first direction and perpendicular to the second direction.