Composite Contact Coating for Low Resistance and Sliding Durability
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Solution Overview
Problem
Existing contact members for high-current applications face challenges in achieving a balance between low electrical resistance and sliding durability, as they experience adhesive wear and increased resistance due to oxidation and friction during repeated sliding and vibration.
Innovation Solution
A contact member comprising a metal base coated with fluorinated oil having a polar group and metal particles surface-treated with a fluorine-based compound having a polar group, with specific ratios and sizes of these components to maintain low electrical resistance and sliding durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If organic component-containing compositions are applied to contact portions for lubrication, then sliding durability is improved, but electrical resistance increases
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by using fluorinated oil with specific fluorine content (20-40 mass%) and metal particles with specific surface treatment. This parameter optimization allows the coating to maintain both low electrical resistance and adequate lubrication, resolving the contradiction between electrical conductivity and sliding durability.
Solution Approach 2:
The patent creates a composite coating material combining fluorinated oil and metal particles with specific surface treatment. This composite structure provides both the lubrication properties from fluorinated oil and the electrical conductivity from metal particles, simultaneously addressing both requirements without sacrificing either sliding durability or electrical resistance.
2Force
If contact surfaces are coated with lubricating compositions, then friction resistance is reduced, but electrical conductivity deteriorates
Solution Approach 1:
The patent optimizes the fluorine content parameter of the fluorinated oil to 20-40 mass%, which provides sufficient lubrication to reduce friction while maintaining adequate electrical conductivity. Additionally, the metal particle content and surface treatment parameters are adjusted to ensure the coating maintains both low friction and good electrical properties.
Solution Approach 2:
The coating is designed as a composite material where fluorinated oil provides lubrication to reduce friction, while embedded metal particles with surface treatment maintain electrical conductivity. This composite approach allows both functions—friction reduction and electrical conduction—to coexist in the same coating layer.
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 contact member achieves low electrical resistance at the start of sliding and during sliding, with improved sliding durability through the use of fluorinated oil and metal particles, extending the number of sliding cycles before exposure of the metal base.
Implementation Method 1
Coating contact portions with organic component-containing compositions for providing lubrication effects is widely practiced to minimize such wear caused by sliding at contacts
Implementation Method 2
silver, gold, and copper, which have a low electrical resistivity, are used primarily as the material of contacts
Implementation Method 3
the coating containing fluorinated oil having a polar group, and metal particles surface-treated with a fluorine-based compound having a polar group
Data Source
AI summary
The present invention provides a contact member that strikes a balance between low electrical resistance and sliding durability. A contact member of the invention has a metal base and a coating disposed on at least part of the metal base. The coating contains fluorinated oil having a polar group, and metal particles surface-treated with a fluorine-based compound having a polar group.