Composite Contact Coating for Low-Load Sliding Conductivity
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Solution Overview
Problem
Existing contact members experience high electrical resistance and reduced sliding durability due to adhesive wear and oxidation when surfaces repeatedly slide under low load conditions, such as 0.1 N, which is not adequately addressed by prior art techniques.
Innovation Solution
A contact member with a metal base coated by fluorinated oil containing a polar group and metal particles surface-treated with a fluorine-based compound having a polar group, where the metal particles have an aspect ratio of 30 or less, to balance low electrical resistance and sliding durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact surfaces are coated with organic component-containing compositions for lubrication, then sliding wear is minimized, but electrical resistance increases under low load conditions
Solution Approach 1:
The coating is formed as a composite material containing both lubricant components (for sliding durability) and conductive metal particles (for electrical conductivity). This composite structure allows the coating to simultaneously provide lubrication effects and maintain low electrical resistance, resolving the contradiction between sliding durability and electrical resistance under low load conditions
Solution Approach 2:
The invention changes the physical and chemical parameters of the coating by controlling metal particle concentration, size distribution, and surface treatment characteristics. By optimizing these parameters, the coating achieves both low friction coefficient and low electrical resistance, solving the contradiction between sliding durability and electrical resistance
2Reliability
If contact pressure is reduced to minimize wear, then adhesive wear decreases, but contact resistance increases
Solution Approach 1:
The coating incorporates conductive metal particles within the lubricant matrix, creating a composite that maintains electrical conductivity even at low contact pressures. The metal particles provide direct conductive pathways while the lubricant matrix reduces friction, resolving the contradiction between sliding durability and contact resistance
Solution Approach 2:
The coating acts as an intermediary layer between contact surfaces, containing both lubricant components that reduce wear and conductive metal particles that maintain electrical contact. This intermediary composite structure allows low contact pressure to be maintained while still achieving low contact resistance through the conductive particle network
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 achieves low electrical resistance and high sliding durability under low load conditions by minimizing adhesive wear and maintaining lubrication, with contact resistance below 5.0 mΩ and sliding cycles exceeding 1000 cycles before exposing 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
Data Source
AI summary
The present invention provides a contact member that strikes a balance between low electrical resistance and sliding durability under the condition of load as low as about 0.1 N. 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.