Alloy Laser Chamber Electrodes for Fluorine Plasma Corrosion
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Solution Overview
Problem
Electrode erosion and corrosion due to fluorine-containing plasmas in laser discharge chambers, leading to non-uniform discharges, arcing, and reduced energy efficiency, necessitating frequent replacement and increased voltage requirements.
Innovation Solution
Use of an alloy electrode comprising a first metal with a high free energy of formation with fluorine and a second metal with a lower free energy of formation, such as CoCu (5-15 wt % or Cu60Ag40 wt %), forming a dense and continuous protective layer to resist corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional electrode materials are used in fluorine-containing plasmas, then initial electrode performance is acceptable, but electrode erosion and corrosion occur rapidly leading to shortened lifetime
Solution Approach 1:
The patent applies composite materials by using an alloy comprising copper and a metal selected from the group consisting of nickel, cobalt, and iron. This composite alloy structure provides both corrosion resistance and electrical conductivity, resolving the contradiction between initial performance and long-term durability in fluorine-containing plasmas.
Solution Approach 2:
The patent changes the material parameters by specifying precise compositional ranges: copper content of 85-99.9 wt% and the secondary metal content of 0.1-15 wt%. These parameter changes optimize the balance between corrosion resistance and electrical conductivity, extending electrode lifetime while maintaining performance.
2Duration of action of stationary object
If electrode material resists wear, then electrode lifetime increases, but chemical reactions with fluorine gas cause continuous formation of reef-like layers blocking efficient plasma formation
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific metal combinations and ratios. The copper-based alloy with controlled secondary metal content (0.1-15 wt%) creates a material that resists fluorine corrosion without forming harmful reef-like corrosion products, thus preventing plasma formation blockage while extending electrode life.
Solution Approach 2:
The patent converts the harmful chemical reactivity with fluorine into a beneficial protective effect. The alloy composition is designed so that the controlled reaction with fluorine creates a stable, non-reefing surface layer that actually protects the electrode from further corrosion while maintaining plasma formation efficiency.
3Power
If voltage differential is increased to maintain energy output due to erosion, then energy output is maintained, but energy efficiency decreases and downstream arcing increases
Solution Approach 1:
The patent applies preliminary action by pre-engineering the electrode material with optimal corrosion resistance properties before operation begins. The copper-based alloy composition is designed in advance to resist erosion and maintain stable discharge gap dimensions, preventing the need for increased voltage and avoiding energy losses associated with compensation for wear.
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
Enhances the lifetime of laser chamber electrodes by reducing erosion and arcing, maintaining energy density, and minimizing discharge gap widening, thus extending the chamber's operational life and reducing energy loss.
Implementation Method 1
an alloy of a first metal having a first free energy of formation with fluorine greater than or equal to the free energy of formation with fluorine of copper, and a second metal having a second free energy of formation with fluorine less than the first free energy
Data Source
AI summary
Disclosed is an electrode for a laser chamber comprising an alloy of a first metal having a first free energy of formation with fluorine greater than or equal to the free energy of formation with fluorine of copper, and a second metal having a second free energy of formation with fluorine less than the first free energy.