Bulk Oxide Superconductor Ag Particle Distribution
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Solution Overview
Problem
Conventional bulk oxide superconductors face challenges in achieving high workability and critical current density, with Ag particle distribution affecting performance under varying external conditions, leading to issues like cracking and reduced mechanical strength.
Innovation Solution
A bulk oxide superconductor with a structure where Ag particles are present only at specific regions, allowing for high workability and critical current density by controlling Ag addition to 5.0 mass % or less during the QMG method, resulting in a structure where Ag particles are either present or absent, optimizing particle distribution for improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Ag is added to improve workability and reduce chipping, then machineability is improved, but Ag particle distribution becomes non-uniform and may cause cracking
Solution Approach 1:
The patent applies local quality by creating distinct regions within the bulk superconductor: a first region with dispersed Ag particles (0.1-5.0 mass%) for improved machineability and reduced chipping, and a second region without Ag particles for high critical current density. This spatial differentiation allows each region to optimize its properties for specific functions, resolving the contradiction between workability and cracking resistance.
2Ease of manufacture
If Ag particles are dispersed throughout the bulk material to improve workability, then machineability is enhanced, but critical current density decreases due to non-uniform distribution
Solution Approach 1:
The patent segments the bulk superconductor into two distinct regions with different Ag particle distributions. The first region contains dispersed Ag particles for improved workability, while the second region excludes Ag particles to maintain high critical current density. This segmentation allows the material to simultaneously achieve both workability and high critical current density by assigning different compositions to different spatial zones.
3Reliability
If Ag is added to reduce contact resistance and enhance electrical properties, then electrical performance is improved, but heat conduction increases which is undesirable for current lead elements
Solution Approach 1:
The patent applies local quality by concentrating Ag particles (0.1-5.0 mass%) specifically in the first region where they are needed to reduce contact resistance and enhance electrical properties. The second region maintains low Ag content to minimize heat conduction. This localized placement allows the material to achieve low contact resistance where electrical connections are made while maintaining thermal insulation in the bulk material.
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 approach enables precise working and high magnetic field generation with reduced contact resistance and heat conduction, enhancing the performance of bulk superconducting magnets and current lead elements.
Implementation Method 1
bulk oxide superconductor having a high workability and high critical current density
Implementation Method 2
the melt method such as the QMG (Quench and Melt Growth) method disclosed, in PLTs 1, 2, 3, etc. is a technique which once raises the temperature to a temperature region where the RE2BaCuO5 phases or RE4Ba2Cu2O10 phases and a liquid phase mainly comprised of B—Cu—O can be copresent, cools to right above the peritectic temperature where REBa2Cu3O7-x (123) is formed
Data Source
AI summary
The present invention has as its problem the provision of a bulk oxide superconductor which has a high workability and high critical current density characteristic regardless of the external conditions and solves the problem by limiting the amount of addition of Ag to 5 mass % or less, using the QMG method to produce a bulk superconductor and thereby obtain a single crystal-like bulk superconductor of a structure with parts where Ag particles are present and parts where Ag particles are not present made to adjoin each other.