YBCO Superconductor Tape Buffer Structure Against CeO2 Peeling
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Solution Overview
Problem
YBCO superconductor tapes face local degradation issues due to the susceptibility of CeO2 buffer layers to peeling during MOD deposition, particularly when exposed to acidic solutions, which affects the mechanical strength and acid resistance of the tape.
Innovation Solution
A method involving the deposition of a second buffer layer with a lateral face portion using RTR RF-magnetron sputtering to extend the CeO2 film onto the lateral faces of the first buffer layer, enhancing acid resistance and preventing peeling, while maintaining lattice compatibility and crystal orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CeO2 buffer layer is deposited on a GZO buffer layer by conventional methods, then good lattice compatibility and crystal orientation are achieved, but the CeO2 layer peels off during MOD deposition and has poor acid resistance
Solution Approach 1:
The CeO2 buffer layer is extended from a two-dimensional planar structure to a three-dimensional structure that covers the lateral faces of the GZO buffer layer. This dimensional extension creates an overhanging protective structure that physically shields the GZO layer from acidic solutions during MOD deposition, preventing both peeling and acid damage simultaneously
Solution Approach 2:
The CeO2 buffer layer is formed to extend over the lateral faces of the GZO buffer layer before the MOD deposition process begins. This preliminary structural preparation ensures that the GZO layer is already protected by the overhanging CeO2 structure, preventing acid solution contact and peeling issues during subsequent processing
2Reliability
If the oxide superconductor film is made thicker to improve Ic value, then the critical current increases, but the mechanical strength and elongation properties deteriorate
Solution Approach 1:
The buffer layer structure is designed with different functional zones: the CeO2 layer extending over the lateral faces provides mechanical protection and acid resistance, while the underlying GZO layer maintains crystal orientation. This localized functional differentiation allows the superconductor film to be thicker for higher Ic without compromising mechanical strength, as the buffer layer structure distributes stress differently
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 stabilizes the superconductor tape characteristics over its entire length, improving mechanical strength and acid resistance, and enabling high-quality YBCO film deposition without cracking, thus enhancing the elongation and performance of the YBCO superconductor tape.
Implementation Method 1
a second buffer layer which is extended to a lateral face of the first buffer layer
Data Source
AI summary
Disclosed are an oxide superconductor tape and a method of manufacturing the oxide superconductor tape capable of improving the length and characteristics of superconductor tape and obtaining stabilized characteristics across the entire length thereof. A Y-class superconductor tape (10), as an oxide superconductor tape, comprises a tape (13) further comprising a tape-shaped non-oriented metallic substrate (11), and a first buffer layer (sheet layer) (12) that is formed by IBAD upon the tape-shaped non-oriented metallic substrate (11); and a second buffer layer (gap layer) (14), further comprising a lateral face portion (14a) that is extended to the lateral faces of the first buffer layer (sheet layer) (12) upon the tape (13) by RTR RF-magnetron sputtering.