Conductive Doped Titania Coating for Metal Substrates
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Solution Overview
Problem
Existing electrochemical devices face challenges in achieving high electrical conductance, corrosion resistance, and electrode reaction activity simultaneously, particularly in metal components used in fuel cells, batteries, and electrolyzers, while maintaining low costs and long-term operation efficiency.
Innovation Solution
The use of titanium alloys with electrically conductive doped titanium oxide layers, grown through various deposition techniques such as vapor deposition or thermal spray, provides improved adhesion and conductivity, incorporating dopants like niobium and tantalum to enhance corrosion resistance and electrode activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If metal components are used for electrochemical applications, then electrical conductance is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent applies composite materials by creating a multi-layer coating structure consisting of a metal substrate with a deposited layer containing metal compounds (nitride, oxide, carbide, or boride) in a matrix. This composite structure combines the high electrical conductance of the metal substrate with the corrosion resistance of the compound phase particles, resolving the contradiction between electrical conductance and corrosion resistance.
2Productivity
If metal surface is used for electrode reactions, then electrode reaction activity is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating a surface layer with non-uniform distribution of metal compound particles within the matrix. The compound phases (nitride, oxide, carbide, or boride) are distributed throughout the surface layer to provide corrosion resistance, while the metal matrix maintains electrical conductance and facilitates electrode reactions. This localized composition optimization resolves the contradiction between electrode reaction activity and corrosion resistance.
3Reliability
If corrosion resistant coating is applied to metal, then corrosion resistance is improved, but electrical conductance deteriorates
Solution Approach 1:
The patent applies composite materials by forming a surface layer where metal compound particles (providing corrosion resistance) are embedded in a conductive metal matrix. This composite structure ensures that the coating provides corrosion protection while the continuous metal matrix phase maintains electrical conductance, preventing the deterioration of electrical properties that would occur with conventional corrosion-resistant coatings.
4Reliability
If multi-phase surface coating is applied, then corrosion resistance is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by controlling the deposition process to create a surface layer with specific phase composition and distribution. The metal compounds (nitride, oxide, carbide, or boride) are formed in-situ during the deposition process from the metal layer, transforming the material phases through controlled parameter changes rather than requiring separate coating layers. This reduces device complexity while maintaining corrosion resistance.
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 results in metal components with enhanced electrical conductivity, corrosion resistance, and electrode reaction activity, suitable for long-term operation in electrochemical devices at a lower cost, effectively addressing the limitations of previous technologies.
Implementation Method 1
deposited on a metal substrate by a vapor deposition process
Implementation Method 2
deposited on a metal substrate by a thermal spray process
Implementation Method 3
an electrically conductive doped titanium oxide grown on the surface of the alloy
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Methods for coating a metal substrate or a metal alloy with electrically conductive titania-based material. The methods produce metal components for electrochemical devices that need high electrical conductance, corrosion resistance and electrode reaction activities for long term operation at a low cost.