Layered REBCO Precursor Pellets for Uniform RE211 Particle Distribution
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Solution Overview
Problem
Current preparation techniques for REBCO high-temperature bulk superconductors face challenges in refining RE211 particles and evenly distributing them, leading to severe pore distribution and deteriorated mechanical performance due to additional oxygen introduction, affecting the superconducting reliability.
Innovation Solution
A method involving layered precursor pellets is employed, comprising solid-phase sintering of reagents, pressing and stacking precursor powders, and top-seeded melt texture growth with annealing, to refine RE211 particles and optimize distribution, reducing porosity and enhancing mechanical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mixed precursor powder (MPP) method is used to refine RE211 particles and optimize particle distribution, then the superconducting performance is improved, but additional oxygen is introduced which causes severe pore distribution inside the final sample, deteriorating mechanical performance and affecting reliability
Solution Approach 1:
The precursor powder is divided into two separate types: first precursor powder containing RE123 and RE211, and second precursor powder containing RE200 and RE023. This segmentation allows each powder type to serve specific functions - the first provides the superconducting matrix while the second provides refined RE211 particles without introducing excessive oxygen, thus resolving the contradiction between superconducting performance and mechanical strength
Solution Approach 2:
Different regions of the bulk superconductor are designed with different precursor powder compositions. The first precursor powder is used in regions where superconducting matrix formation is critical, while the second precursor powder with higher refined particle proportion is used in regions where pinning centers are most needed. This local optimization allows simultaneous achievement of good superconducting performance and reduced pore distribution
2Manufacturing precision
If RE211 particles are refined and evenly distributed to improve superconducting performance, then pinning centers are optimized, but pore distribution becomes severe due to additional oxygen introduction, affecting reliability
Solution Approach 1:
The precursor system is segmented into two distinct powder types with different compositions and functions. The first precursor powder (RE123+RE211) and second precursor powder (RE200+RE023) are mixed in controlled proportions, allowing refined particle distribution without the harmful effects of excessive oxygen introduction that would compromise reliability
Solution Approach 2:
The invention uses a composite precursor system combining two different powder compositions. The first precursor powder provides the superconducting matrix while the second precursor powder provides refined RE211 particles. This composite approach achieves uniform particle distribution and maintains sample reliability by avoiding the oxygen-related pore formation problems of single-precursor methods
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 method improves superconducting performance by refining RE211 particles, maintaining porosity at 18%, and enhancing mechanical and superconducting properties of the bulk material.
Implementation Method 1
preparing original powders by a solid-phase sintering method
Implementation Method 2
processing an REBCO original crystal seed, the combined precursor pellet and the buffer layer based on a preset top-seeded melt texture growth method
Implementation Method 3
performing annealing treatment according to the initial REBCO high-temperature bulk superconductor to obtain a final REBCO high-temperature bulk superconductor
Data Source
AI summary
A method for preparing a high-performance REBCO high-temperature bulk superconductor based on a layered precursor pellet includes: obtaining original reagents with preset molar ratios, and preparing original powders by a solid-phase sintering method; preparing three types of precursor powder combinations by mixing the original powders with preset molar ratios; pressing and stacking the precursor powder combinations to obtain a combined precursor pellet, pressing buffer precursor powders to obtain a buffer layer; processing an REBCO original seed crystal, the combined precursor pellet and the buffer layer based on a preset top-seeded melt texture growth method to obtain an initial REBCO high-temperature bulk superconductor; and performing annealing treatment according to the initial REBCO high-temperature bulk superconductor to obtain a final REBCO high-temperature bulk superconductor. The method achieves the refinement of the second phase particles in the solid solution by the modified precursor powders, and improves the superconducting performance of the bulk material.