3D-Printed Monocrystalline REBCO for Grain-Boundary-Free Current Transport
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Solution Overview
Problem
Existing additive manufacturing methods for YBCO superconductors result in polycrystalline microstructures with low critical current density due to grain boundaries, limiting their application in complex 3D architectures and requiring brittle tapes or simple shapes.
Innovation Solution
A method involving 3D-ink-printing of RE123+RE211 architectures, followed by sintering and single-crystal growth, to achieve monocrystalline structures with high critical current density, using a mixture of RE2O3, BaCO3, and Cu precursors with a binder and solvent, and a monocrystalline seed for melt growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additive manufacturing is used to fabricate YBCO superconductors, then design flexibility and architectural freedom are improved, but the microstructure becomes polycrystalline with grain boundaries that reduce critical current density
Solution Approach 1:
A monocrystalline seed is placed at the bottom of the mold before sintering, preparing the nucleation site in advance. This preliminary action ensures that single crystals grow upward from the seed during the sintering process, eliminating grain boundaries while maintaining the 3D-printed architecture's design flexibility.
Solution Approach 2:
The sintering process parameters are optimized to promote single-crystal growth from the seed. By controlling temperature, atmosphere, and duration, the process transforms the polycrystalline structure into a monocrystalline structure while preserving the complex 3D geometry printed by additive manufacturing.
2Ease of manufacture
If conventional sintering is used after additive manufacturing, then the 3D structure is formed, but grain boundaries are created that act as weak links for current transport
Solution Approach 1:
The monocrystalline seed is positioned at the bottom of the mold before sintering begins. This preliminary placement ensures that during the sintering process, single crystals nucleate and grow upward from the seed, creating a monocrystalline structure that eliminates grain boundaries while still allowing the 3D structure to form.
Solution Approach 2:
The sintering process utilizes phase transitions of the REBCO materials to enable single-crystal growth. By controlling the thermal history and atmosphere during sintering, the process promotes crystallization from the seed, transforming the material from a polycrystalline to a monocrystalline state while maintaining the additive-manufactured geometry.
3Reliability
If coated tapes are used to achieve high critical current density, then current density is improved, but the tapes are brittle and cannot be bent or shaped into complex 3D objects
Solution Approach 1:
The invention transitions from 2D coated tapes to 3D monocrystalline structures. By using additive manufacturing to create three-dimensional architectures with single-crystal microstructure, the invention achieves both high critical current density and the ability to form complex 3D shapes, eliminating the brittleness and shape limitations of conventional tapes.
Solution Approach 2:
The invention uses composite REBCO materials (such as YBCO with Y211 inclusions) that combine the high critical current density properties of monocrystalline structures with the manufacturing flexibility of additive manufacturing. This composite approach enables the fabrication of complex 3D objects with superior electrical properties.
4Reliability
If bulk single crystals are grown by top-seeded methods, then high critical current density is achieved, but only simple cylinder or cuboid shapes can be produced
Solution Approach 1:
The invention extends the top-seeded single-crystal growth method from simple 1D cylinders to complex 3D architectures. By combining additive manufacturing with seeded crystal growth, the invention enables monocrystalline structures with intricate geometries, coils, and multi-component assemblies that were previously impossible to fabricate.
Solution Approach 2:
The complex 3D architecture is preliminarily fabricated using additive manufacturing, and then a monocrystalline seed is placed within this pre-formed structure. During sintering, single crystals grow from the seed to transform the entire pre-fabricated architecture into a monocrystalline structure, combining geometric complexity with high critical current density.
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 achieves a nearly hundred-fold improvement in critical current density and enables the fabrication of complex 3D monocrystalline REBCO objects with high critical temperature, suitable for applications like magnetic resonance imaging and fusion power plants.
Implementation Method 1
performing single-crystal growth of monocrystalline structures from the polycrystalline 3D-printed object to fabricate the monocrystalline superconductor
Implementation Method 2
sintering the 3D-printed object to obtain a polycrystalline 3D-printed object comprising REBa2Cu3O7-x(RE123)+RE2BaCuO5(RE211)
Implementation Method 3
Yttrium barium copper oxide YBa2Cu3O7-x (YBCO or Y123) is the original high-temperature cuprate oxide with a superconducting critical temperature (Tc ̃93 K)
Data Source
AI summary
This invention discloses a monocrystalline superconductor and a method for fabricating the monocrystalline superconductor. The method includes providing an ink comprising a mixture of powders of RE2O3, BaCO3, and a Ba and/or Cu precursor with a binder and a solvent; extruding the ink into micro-lattices layer by layer to form a three dimension (3D)-printed object with a desired architecture; sintering the 3D-printed object to obtain a polycrystalline 3D-printed object comprising REBa2Cu3O7-x(RE123)+RE2BaCuO5 (RE211); and performing single-crystal growth of monocrystalline structures from the polycrystalline 3D-printed object to fabricate the monocrystalline superconductor, wherein RE represents a rare-earth element selected from the group consisting of Y, La, Sm, Nd, Gd, and Eu.