Nb3Sn A15 Coating by Dual-Target Sputtering Below 600°C
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Solution Overview
Problem
Existing methods for producing coatings of A15 phases, such as Nb3Sn, are costly and result in inhomogeneous coatings with adverse diffusion effects, affecting superconductive properties and requiring high-temperature heat treatments.
Innovation Solution
A method involving simultaneous sputtering of two targets with controlled sputter rates and a heating temperature below 600°C to achieve a homogeneous A15 phase coating on a base body, eliminating the need for a diffusion barrier and high-temperature treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sputtering methods are used to produce A15 phase coatings, then the coating can be formed, but the process requires high-temperature heat treatment (1000°C or more) which causes inhomogeneous coatings and adverse diffusion effects
Solution Approach 1:
The patent changes the sputtering parameters by introducing a magnetic field to enhance ion bombardment efficiency, enabling the formation of A15 phase coatings at lower temperatures (below 1000°C). This parameter modification allows the coating to form homogeneously without requiring excessive heat treatment, thereby resolving the contradiction between coating homogeneity and heat treatment temperature.
Solution Approach 2:
The patent replaces the conventional thermal diffusion mechanism (relying on high-temperature heat treatment) with a magnetically-enhanced sputtering process. By using magnetic fields to control ion trajectories and increase bombardment intensity, the patent achieves phase formation through physical deposition rather than thermal diffusion, eliminating the need for high-temperature treatment and preventing adverse diffusion effects.
2Reliability
If high-temperature heat treatment is applied to form A15 phase coating, then the desired phase can be produced, but atoms from the base body diffuse into the coating, affecting superconductive properties
Solution Approach 1:
The patent substitutes thermal diffusion with magnetically-controlled physical deposition. By using magnetic fields to enhance ion bombardment during sputtering, the patent forms the A15 phase coating directly through physical processes at lower temperatures, preventing base body atoms from diffusing into the coating while maintaining superconductive properties.
Solution Approach 2:
The patent applies magnetic field enhancement during the sputtering process to pre-form the A15 phase coating with correct stoichiometry before any potential diffusion can occur. This preliminary formation of the desired phase structure prevents subsequent adverse diffusion effects by establishing the coating composition early in the process.
3Productivity
If conventional sputtering is used without magnetic field enhancement, then the process is simpler, but the coating formation is less efficient and requires longer processing time
Solution Approach 1:
The patent introduces magnetic field enhancement to the sputtering process to improve coating formation efficiency. The magnetic field confines and intensifies ion bombardment on the target, increasing sputtering yield and coating deposition rate. Although this adds some device complexity, the significant improvement in productivity and coating quality justifies the modification.
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 method enables an economical and reliable production of a homogeneous A15 phase coating with superior superconductive properties, suitable for applications like particle accelerators, without the drawbacks of traditional methods.
Implementation Method 1
In a method described as sputtering, atoms from a solid described as the target are liberated by bombardment with energy-rich ions so that the liberated target atoms pass into the gas phase and are deposited on surfaces located in the vicinity
Implementation Method 2
the base body is heated, during the sputtering process, by a heating device to a coating temperature of less than six hundred degrees Celsius
Implementation Method 3
During a sputtering process with sputter gas ions, first target particles are liberated from the first target and are deposited as coating particles on the base body
Data Source
AI summary
In a method for coating a base body, a first target and a second target are arranged in a vacuum chamber. A base body to be coated is arranged in the vacuum chamber is heated to a coating temperature of less than 600° C. During sputtering with sputter gas ions, first target particles are liberated from the first target and second target particles are liberated from the second target and are deposited as coating particles on the base body. A first sputter rate is specified for the first target and a second sputter rate is specified for the second target such that, during the sputtering process, the coating is generated as an A15 phase with an intended stoichiometric ratio of the first target particles to the second target particles. A functional element has a base body and a coating of Nb3Sn applied directly on the surface of the base body.