Oxide Superconducting Wire Cu Plating for High Tensile Strength
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Solution Overview
Problem
Oxide superconducting wires face a challenge in achieving high tensile strength due to the low hardness of copper stabilization layers, which increases when the stabilization layer thickness is increased.
Innovation Solution
The oxide superconducting wire incorporates a Cu plating layer with a Vickers hardness of 80 to 190 HV, an average crystal grain size of 0.52 to 1.00 µm, and an average number of grain boundaries per 100 µm length of 100 or more, forming a stabilization layer that enhances tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stabilization layer thickness is increased, then the mechanical stability is improved, but the tensile strength decreases
Solution Approach 1:
The invention changes the physical parameters of the Cu plating layer by controlling its crystal grain size to be within 0.52 to 1.00 μm and its Vickers hardness to be within 80 to 190 HV. This parameter optimization allows the stabilization layer to provide adequate mechanical stability while maintaining high tensile strength of 600 MPa or more, resolving the contradiction between thickness-related stability and overall tensile strength.
Solution Approach 2:
The invention applies local quality control by creating a Cu plating layer with specific local characteristics (controlled crystal grain size and hardness) that differ from conventional uniform structures. This localized optimization of material properties enables the stabilization layer to simultaneously achieve mechanical stability and high tensile strength without requiring increased thickness.
2Strength
If the Cu plating layer hardness is increased, then the tensile strength is improved, but the ductility decreases
Solution Approach 1:
The invention optimizes the Vickers hardness parameter of the Cu plating layer to fall within 80 to 190 HV, which is higher than conventional Cu layers but controlled to maintain ductility. This specific hardness range, combined with controlled crystal grain size, achieves the dual benefit of high tensile strength (600 MPa or more) while preserving adequate ductility for wire drawing and forming operations.
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 an oxide superconducting wire with a tensile strength of 600 MPa or more, effectively addressing the issue of low tensile strength associated with thicker stabilization layers.
Implementation Method 1
a Cu plating layer which is formed by electroplating on the protection layer
Data Source
Figure 1
AI summary
An oxide superconducting wire includes a superconducting laminate including an oxide superconducting layer on a substrate, and a stabilization layer which is a Cu plating layer covering the outer periphery of the superconducting laminate, and a Vickers hardness of the Cu plating layer is in the range of 80 to 190 HV.