Conductive Bed Layer for Superconducting Conductor Biaxial Orientation
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Solution Overview
Problem
Existing methods for manufacturing superconductive conductors face challenges in achieving excellent biaxial orientation and energization characteristics due to issues like local peeling of bed layers during deposition, especially when using indium tin oxide or insulating substrates, leading to inferior superconducting properties.
Innovation Solution
A method involving the formation of a conductive bed layer with electrical resistivity between 10^-6 and 10^-1 Ω·cm on a substrate, followed by a biaxially oriented layer using a sputtering method, particularly with materials like LiTi2O4 or SrRuO3, and MgO, to enhance the biaxial orientation and prevent arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If indium tin oxide is used as an intermediate layer to improve biaxial orientation, then the crystallinity is improved, but the manufacturing cost increases due to the need for a thick layer (about 350 nm)
Solution Approach 1:
The invention changes the material parameter from indium tin oxide to rhodium, and adjusts the thickness parameter from 350 nm to 5 nm or less, achieving excellent biaxial orientation with a much thinner layer and lower cost
2Manufacturing precision
If a non-oriented metal substrate is used with an insulating bed layer (e.g., Gd2Zr2O7), then the substrate can support the biaxially oriented layer, but arcing occurs during sputtering deposition causing local peeling of the bed layer
Solution Approach 1:
The invention changes the electrical property parameter of the bed layer from insulating to conductive by using rhodium, which prevents arcing during sputtering deposition while maintaining excellent biaxial orientation and preventing local peeling
Solution Approach 2:
The invention creates a composite structure with a conductive bed layer (rhodium) between the non-oriented metal substrate and the biaxially oriented superconducting layer, combining the benefits of substrate support, arcing prevention, and orientation control
3Reliability
If the bed layer is made conductive to prevent arcing, then deposition stability improves, but the complexity of selecting appropriate materials increases
Solution Approach 1:
Rhodium serves multiple functions simultaneously: it provides conductivity to prevent arcing, acts as an intermediate layer for biaxial orientation, and ensures good adhesion between layers, reducing the need for multiple separate functional layers
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 the formation of a superconductive conductor with excellent biaxial orientation and improved energization characteristics, reducing the likelihood of arcing and peeling, thereby enhancing the critical current and overall performance of the superconducting layer.
Implementation Method 1
a biaxially oriented layer forming process of forming a biaxially oriented layer on the bed layer
Data Source
AI summary
A method for manufacturing a base material 2 for a superconductive conductor which includes: a conductive bed layer forming process of forming a non-oriented bed layer 24 having conductivity on a substrate 10; and a biaxially oriented layer forming process of forming a biaxially oriented layer 26 on the bed layer 24.