Fluorine-Coated Silver Powder for Switch Contact Durability
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Solution Overview
Problem
Existing switch contact point technologies face issues with durability and reliability due to high friction coefficients and abrasion, particularly when switches are operated on slanted surfaces, where coatings like fluorine-based resin and grease fail to maintain lubrication over time, leading to reduced performance and increased risk of failure.
Innovation Solution
A method for manufacturing a fluorine-based resin coating silver powder with a grain size of 10 nm to 10 µm, mixed with ethanol and fluorine silane, applied at a thickness of 1 nm to 10 nm, and sintered at 300 to 350°C to create a durable and conductive coating that reduces friction and abrasion on switch contact points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a coating film including fluorine-based resin particulate and fluorine-based oil is formed on the surface of contact point material base material, then the surface friction coefficient is reduced and workability is improved, but the coating peels according to sliding durability and contact resistance increases
Solution Approach 1:
The patent utilizes a porous sintered silver layer structure where silver particles are sintered to form interconnected pores. This porous structure allows the fluorine-based resin coating to penetrate and anchor within the pores, creating mechanical interlocking that prevents coating peeling while maintaining low friction coefficients and electrical conductivity.
Solution Approach 2:
The patent creates a composite structure combining sintered silver particles with fluorine-based resin coating. The silver particles provide electrical conductivity and structural integrity, while the fluorine-based resin provides low friction and wear resistance. This composite approach resolves the contradiction by integrating both functional requirements in a single layered structure.
2Force
If grease is applied to reduce the friction coefficient of switch contact point, then the friction coefficient is reduced, but the grease flows down on slanted surfaces at high temperature and loses its intended function
Solution Approach 1:
The patent employs a thin film fluorine-based resin coating that forms a stable, adherent layer on the contact point surface. This thin film structure remains positionally stable on slanted surfaces at high temperatures, unlike grease which flows due to gravity and heat. The coating maintains its lubricating function without migrating or losing its intended position.
3Length of stationary object
If a coating layer is thinly distributed on only the surface of contact point material base material, then the thickness is reduced to 0.2 μm, but coating peeling occurs and contact resistance is disadvantageously increased
Solution Approach 1:
The patent creates a porous sintered silver layer with interconnected voids that allow the fluorine-based resin coating to penetrate and anchor. This porous substrate structure provides mechanical interlocking that significantly enhances coating adhesion, preventing peeling even with thin coating layers while maintaining electrical conductivity through the silver particle network.
4Reliability
If silver plating is used for switch contact points, then electrical conductivity is maintained, but friction coefficient and abrasion are high reducing durability
Solution Approach 1:
The patent creates a composite structure where a sintered silver layer provides electrical conductivity and a fluorine-based resin coating provides low friction and wear resistance. This composite approach allows both functions to coexist: the silver particles maintain electrical pathways while the fluorine coating reduces direct metal-to-metal contact, thereby reducing friction and abrasion.
Solution Approach 2:
The fluorine-based resin coating acts as an intermediary layer between contacting surfaces. Instead of direct silver-to-silver contact that causes high friction and wear, the fluorine coating mediates the interaction, providing a low-friction interface while the underlying silver particles maintain electrical conductivity.
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 solution provides enhanced abrasion resistance and electric conductivity while maintaining low friction coefficients, even on slanted surfaces, with improved durability and reliability compared to traditional silver plating and resin coatings.
Implementation Method 1
a fluorine-based resin coating silver powder manufacturing step of manufacturing a fluorine-based resin coating silver powder coated with the fluorine-based resin at a thickness of 1 nm to 10 nm by adding the silver powder mixed with the ethanol solution in the silver powder solution mixing step and the fluorine silane prepared in the fluorine silane preparing step to the solution having the pH that is adjusted to the pH set in the pH adjustment solution preparing step, followed by mixing
Implementation Method 2
a sintering step of printing a mixture powder mixed in the silver powder mixing step on a surface of an electrode and then sintering the mixture powder at a set sintering temperature
Data Source
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AI summary
A method for manufacturing a fluorine-based resin coating powder includes a silver powder preparing step of preparing a silver powder having a predetermined grain size, a silver powder solution mixing step of adding the silver powder to an ethanol solution, followed by mixing, a PH adjustment solution preparing step of preparing a solution having a pH that is adjusted to a set PH, a fluorine silane preparing step of preparing fluorine silane, and a fluorine-based resin coating silver powder manufacturing step of manufacturing a fluorine-based resin coating silver powder coated with the fluorine-based resin at a set thickness by adding the silver powder mixed with the ethanol solution in the silver powder solution mixing step and the fluorine silane prepared in the fluorine silane preparing step to the solution having the pH that is adjusted to the PH set in the PH adjustment solution preparing step, followed by mixing.