Electroplated NbTi Coaxial Surface for Oxide-Free Soldering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Niobium-titanium (NbTi) substrates form tough oxide layers when heated, preventing normal soldering and causing issues in electronic circuit applications, especially at ultra-low temperatures, where traditional soldering methods fail, and common connections result in excessive attenuation.
Innovation Solution
Electroplating multiple metal layers, such as nickel, copper, and gold, onto NbTi substrates to create a solderable surface that allows for direct soldering of connectors without high vacuum or ultrasonic techniques, enhancing adhesion and thermal conductivity while reducing oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If NbTi substrate is heated for soldering, then soldering can be performed, but a tough oxide layer forms that prevents normal soldering
Solution Approach 1:
The patent applies preliminary action by depositing a solderable metal layer (such as silver, copper, or nickel) onto the NbTi substrate before soldering operations. This pre-deposited layer serves as an intermediate barrier that prevents oxide formation during heating while providing a solder-receptive surface, thereby enabling conventional soldering processes without requiring high vacuum or ultrasonic techniques.
Solution Approach 2:
The patent employs an intermediary approach by introducing a metal interlayer between the NbTi substrate and the solder joint. This interlayer acts as a mediator that decouples the conflicting requirements: it protects the NbTi from oxidation during heating while simultaneously providing excellent solder wettability and adhesion, thus resolving the contradiction between soldering ease and oxide prevention.
2Ease of manufacture
If common connections (stainless steel/cupro-nickel) are used in dilution refrigerator, then connections can be made, but excessive attenuation occurs
Solution Approach 1:
The patent applies parameter changes by selecting materials with superior electrical conductivity parameters for the metal layers deposited on the NbTi substrate. By using materials such as silver or copper with high conductivity, the patent optimizes the electrical parameters of the connection to minimize signal attenuation at ultra-low temperatures, while maintaining ease of manufacturing through standard electroplating processes.
3Temperature
If NbTi is used as coaxial cable, then ultra-low temperature operation is enabled, but soldering becomes impossible without high vacuum
Solution Approach 1:
The patent applies preliminary action by pre-depositing a solderable metal layer onto the NbTi coaxial cable substrate before assembly and soldering operations. This pre-prepared surface allows subsequent soldering to be performed using conventional heating methods without requiring high vacuum environments, thereby maintaining ultra-low temperature operational capability while dramatically simplifying the manufacturing process.
4Reliability
If multiple metal layers are plated on NbTi, then adhesion and thermal conductivity improve, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by implementing a functionally differentiated multi-layer structure where each metal layer serves a specific purpose: the first layer (e.g., silver or copper) provides solderability and electrical conductivity, the second layer (e.g., nickel) provides oxidation resistance and adhesion, and optional third layers provide corrosion resistance or specific thermal properties. This localized functional assignment optimizes reliability while managing manufacturing complexity through standardized electroplating processes.
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
Enables NbTi coaxial cables to operate at ultra-low temperatures with improved signal transmission, reduced attenuation, and no undesirable signal reflections, maintaining mechanical strength comparable to copper coaxial lines.
Implementation Method 1
electroplating multiple metal layers, such as nickel, copper, and gold, onto NbTi substrates
Data Source
AI summary
Devices, systems, and/or methods that can facilitate plating one or more metal layers onto a niobium-titanium substrate are provided. According to an embodiment, a device can comprise a niobium-titanium substrate. The device can further comprise a first metal layer plated on a portion of the niobium-titanium substrate. The device can further comprise a second metal layer plated on the first metal layer. The device can further comprise a third metal layer plated on the second metal layer.