Electrochemical Polishing Graphite Gate Electrodes
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Solution Overview
Problem
The existing surface treatment processes for graphite gate electrodes are inefficient in removing impurities and burrs, leading to poor vacuum quality and high-voltage-withstanding issues, with gasoline-based methods being hazardous and time-consuming.
Innovation Solution
An electrochemical polishing solution comprising water, alkaline metal hydroxide, a weak acid salt, and an additive, such as sodium hydroxide, potassium hydrogen fluoride, and glycerin, is used to electrochemically polish the graphite gate electrode, reducing treatment time and enhancing detergency, resulting in a cleaner surface and improved high-voltage-withstanding ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gasoline-based cleaning treatment is used for graphite gate electrode, then de-oiling effect is achieved, but the treatment duration is long and flammability hazard exists
Solution Approach 1:
The patent changes the chemical parameters of the cleaning solution by using alkaline metal hydroxide (NaOH or KOH) with specific concentration ranges (195-205 parts by weight per 900-1000 parts water) instead of gasoline, achieving effective de-oiling with reduced treatment time and eliminated flammability hazards
Solution Approach 2:
The patent replaces the chemical mechanism of gasoline-based cleaning with an electrochemical polishing mechanism using electrolytic cell and electric current, transforming the cleaning process from purely chemical dissolution to electrochemical reaction that removes impurities more efficiently
2Ease of manufacture
If traditional cleaning treatment is used for graphite gate electrode, then surface cleaning is achieved, but burrs and dusts on surface are not removed
Solution Approach 1:
The patent replaces traditional mechanical and chemical cleaning methods with electrochemical polishing that uses electric current to selectively remove burrs and dusts through controlled electrolysis, achieving superior surface quality by converting convex portions into concave portions and eliminating protrusions
Solution Approach 2:
The patent changes the cleaning mechanism from passive chemical dissolution to active electrochemical reaction by applying electric current, enabling selective removal of surface imperfections like burrs and dusts while preserving the base metal structure
3Device complexity
If impurities are not removed from graphite gate electrode, then production process is simplified, but vacuum degree deteriorates and high-voltage-withstanding ability is affected
Solution Approach 1:
The patent performs preliminary electrochemical polishing treatment on the graphite gate electrode before it is installed in the electron tube, removing all impurities including paraffin wax, dusts, and burrs in advance, ensuring that no gas-releasing substances remain to compromise vacuum quality or electrical performance during subsequent operation
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
The process achieves a cleaner surface, reduces gas release, and enhances the high-voltage-withstanding ability of the gate electrode, while being safer and more efficient than traditional methods, with a significant reduction in treatment duration and elimination of flammable substances.
Implementation Method 1
the surface treating process for a graphite gate electrode comprises the steps of immersing the graphite gate electrode into gasoline for 12 h, washing the graphite gate electrode with tap water to clean it, then boiling it with deionized water for 30 min, thereafter, cleaning it with ultrasonic treatment for 1 h
Implementation Method 2
cleaning it with ultrasonic treatment for 1 h
Data Source
AI summary
The invention discloses an electrochemical polishing solution, a process for electrochemically polishing a graphite gate electrode and a graphite gate electrode, which are used for providing an electrochemical polishing solution and a polishing process to efficiently remove the contaminant on the surface of a gate electrode and improve the quality of the gate electrode. Said electrochemical polishing solution comprises 900-1000 parts by weight of water; 195-205 parts by weight of an alkaline metal hydroxide; 49-51 parts by weight of a weak acid salt; and 294-306 parts by weight of an additive.