Oxide Superconducting Wire Grain Orientation for Low-Resistance Joints
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Solution Overview
Problem
Existing oxide superconducting wires experience increased connection resistance and joule heat at connection points due to soldering, particularly in the interlayer resistance between the superconducting layer and the protective layer, which hinders the flow of bypass currents during quenching.
Innovation Solution
The superconducting layer is configured with a-axis oriented grains perpendicular to the substrate surface, with a grain ratio of 4.1 to 11.9%, reducing interlayer resistance and ensuring a critical current density in the longitudinal direction by optimizing the grain orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If oxide superconducting wires are solder-connected to produce long wires, then the wire length is extended, but the connection resistance at the connection part increases
Solution Approach 1:
The invention changes the crystallographic orientation parameters of the superconducting layer by controlling the a-axis oriented grain ratio to be 10% or more, which fundamentally alters the electrical resistance characteristics at the interface between the superconducting layer and protective layer, thereby reducing connection resistance in soldered joints
Solution Approach 2:
The invention applies local quality control by specifically targeting the interfacial region between the superconducting layer and protective layer, creating a localized optimization of grain orientation at the connection interface while maintaining overall wire structure integrity
2Ease of manufacture
If solder connecting is used to connect superconducting wires, then the wires can be joined, but the interlayer resistance between the superconducting layer and protective layer increases
Solution Approach 1:
The invention modifies the crystallographic parameter (a-axis oriented grain ratio) of the superconducting layer to 10% or more, which changes the electrical properties at the superconducting layer-protective layer interface, thereby reducing interlayer resistance and improving the effectiveness of solder connecting
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 results in a reduced interlayer resistance and maintained critical current density, enabling the production of long superconducting wires with lower connection resistance through soldering multiple wires together.
Implementation Method 1
a superconducting layer provided above the substrate and formed of a rare-earth high-temperature superconductor
Implementation Method 2
a-axis oriented grains having an a-axis oriented in a direction perpendicular to the main surface of the substrate
Data Source
AI summary
An oxide superconducting wire includes: a substrate having a main surface; a superconducting layer disposed above the substrate and formed of a rare-earth high-temperature superconductor; and a protective layer disposed on the superconducting layer and in contact with the superconducting layer. An a-axis direction is oriented perpendicular to the main surface of the substrate. The superconducting layer includes a-axis oriented grains oriented along the a-axis direction. An a-axis oriented grain ratio is defined as a proportion of the a-axis oriented grains to an entirety of crystal grains forming the superconducting layer. The a-axis oriented grain ratio is greater than or equal to 4.1% and less than or equal to 11.9%.