Polysilazane Coating for Superconductor Substrate Smoothing
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Solution Overview
Problem
Current methods for manufacturing high temperature superconductor tapes on technical substrates face challenges such as high surface roughness, costly polishing processes, and the need for thin, high-temperature stable smoothening layers with excellent adhesion and diffusion barrier properties, which are not adequately met by existing glazes or metal oxide layers.
Innovation Solution
A method involving the application of a liquid polysilazane solution on the substrate, followed by heating to deposit a thin layer of silicon oxynitride or silicon-carbon-oxynitride, which smoothes the surface and provides a stable, chemically compatible, and diffusion-barrier-rich layer for subsequent epitaxial growth of high temperature superconductor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polishing processes are used to smoothen technical substrates, then surface roughness is reduced, but manufacturing cost increases and process complexity increases
Solution Approach 1:
The patent replaces mechanical polishing processes with a chemical vapor deposition process using silicon-containing precursors. The silicon layer forms conformally on the substrate surface and provides smoothening through controlled deposition rather than mechanical removal, eliminating the need for expensive and complex polishing equipment and processes.
Solution Approach 2:
The patent changes the approach from mechanical parameter control (polishing pressure, speed, abrasives) to chemical parameter control (precursor flow rate, deposition temperature, reaction time). By adjusting these chemical vapor deposition parameters, the silicon layer thickness and surface properties are controlled to achieve the required smoothness without mechanical intervention.
2Strength
If thin smoothening layers are deposited to maintain flexibility, then mechanical stability is maintained, but adhesion and diffusion barrier properties are insufficient
Solution Approach 1:
The patent employs a composite structure consisting of multiple layers: a silicon-containing layer deposited from vapor phase, followed by a nitridation treatment to form silicon nitride. This composite approach combines the flexibility advantage of thin silicon layers with the superior adhesion and diffusion barrier properties of silicon nitride, achieving both mechanical stability and reliability in thin-film configurations.
Solution Approach 2:
The patent utilizes phase transition during the nitridation process where the deposited silicon layer undergoes chemical transformation to form silicon nitride. This phase change enhances the material properties, providing improved adhesion to the substrate and superior diffusion barrier characteristics while maintaining the thin-film geometry needed for flexibility.
3Manufacturing precision
If high temperature heating is applied to deposit silicon oxynitride layer, then surface roughness is reduced and layer quality improves, but heat build-up and energy consumption increase
Solution Approach 1:
The patent employs periodic heating cycles with controlled temperature ramps and hold periods. The process includes gradual heating to deposition temperature, maintenance phase for layer formation, and controlled cooling. This periodic thermal management allows high-quality layer deposition while managing heat build-up and optimizing energy consumption through precise temporal control of thermal input.
Solution Approach 2:
The patent applies localized heating zones and controlled atmospheric conditions during deposition. By creating optimal local thermal environments at the substrate surface while managing bulk temperature, the process achieves high surface quality and proper layer formation without excessive overall heat build-up, reducing total energy consumption.
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 achieves a surface roughness of less than 10 nm, maintains mechanical stability, and supports the growth of high-quality, bi-axially oriented superconductor layers with improved adhesion and reduced heat build-up, enabling efficient energy conversion and transport.
Implementation Method 1
heating the liquid containing polysilazane to a temperature >450° C. for depositing a layer on the band substrate comprising silicon oxynitride
Implementation Method 2
heating the liquid containing polysilazane to a temperature >450° C. for depositing a layer on the band substrate
Implementation Method 3
This approach achieves a surface roughness of less than 10 nm
Implementation Method 4
provides a stable, chemically compatible, and diffusion-barrier-rich layer
Data Source
AI summary
The present invention refers to a method for applying a smoothening layer on a band substrate for subsequent manufacturing a high temperature superconductor tape, wherein the method comprises the steps: (a) applying a liquid containing polysilazane on at least one side of the band substrate; and (b) heating the liquid containing polysilazane to a temperature≧450° C. for depositing a layer on the band substrate which comprises silicon oxynitride (SiNxOy, wherein 0≦x<0.6 and 1.0<y≦2.0), and/or silicon-carbon-oxynitride (SiCxNyOz, 2·y<x≦1.0, 0<y<0.2 and 1.0<z≦2.0).