Conductive Dynamic Seal With Ti-Doped DLC for Wear-Stable Contact
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Solution Overview
Problem
Existing electrically conductive polymer composites used in dynamic seals suffer from poor sliding contact performance and degradation of electrical conductivity due to wear, leading to reduced operating life and unstable signal transfer.
Innovation Solution
A dynamic sealing element with a multilayer structure comprising a sealing body made of an electrically conductive polymer composite, an interlayer of titanium, and a titanium-doped diamond-like carbon (Ti-doped DLC) coating with a gradient titanium concentration, providing improved adhesion and enhanced tribological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrically conductive polymer composite is used for dynamic seals, then electrical conductivity is provided, but wear resistance and sliding contact performance deteriorate due to the softness of the polymeric matrix
Solution Approach 1:
The patent applies a multilayer composite structure combining polymer composite with metallic and ceramic coatings. The sealing body uses electrically conductive polymer composite (PTFE with carbon fibers) for baseline conductivity and corrosion resistance, while additional layers (metallic coating for wear resistance, ceramic coating for friction reduction) provide enhanced tribological properties. This composite approach allows simultaneous achievement of electrical conductivity, wear resistance, and low friction that cannot be obtained with single materials.
Solution Approach 2:
The patent implements different material properties at different locations and layers of the sealing element. The polymer composite provides bulk electrical conductivity and corrosion resistance, the metallic coating layer provides wear resistance at the sliding interface, and the ceramic coating provides low friction properties. Each layer is optimized for its specific function, creating local quality variations that collectively solve the contradiction between conductivity and wear resistance.
2Reliability
If a thin metallic coating is applied to an electrically conductive polymeric composite, then electrical conductivity is improved, but wear resistance deteriorates due to rapid degradation of the metal coating
Solution Approach 1:
The patent creates a composite coating system where a metallic layer is combined with a ceramic layer. The metallic coating provides excellent electrical conductivity and adhesion to the polymer substrate, while the ceramic coating provides superior wear resistance and durability. This composite coating structure prevents the rapid degradation observed in single-layer metallic coatings by protecting the metal layer with the more durable ceramic layer.
Solution Approach 2:
The patent uses the ceramic coating as an intermediary layer that protects the metallic coating from direct wear and environmental degradation. The ceramic layer acts as a protective mediator that maintains the integrity of the underlying metallic layer, thereby extending the operating life of the coated sealing element while preserving the electrical conductivity provided by the metal layer.
3Loss of information
If sliding contact is used for signal transmission, then electrical current transfer is achieved, but signal stability deteriorates due to friction and material loss
Solution Approach 1:
The patent employs a composite structure with ceramic coating on the sliding surface to minimize friction and wear during signal transmission. The ceramic material provides extremely low coefficient of friction and high wear resistance, ensuring stable sliding contact over extended periods. This maintains consistent electrical contact for signal transmission while minimizing energy loss to friction and preventing material loss that would degrade signal stability.
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 multilayer structure achieves prolonged electrical conductivity, low friction, and increased wear resistance, resulting in a significantly extended operating life and stable signal transfer.
Implementation Method 1
a coating layer (2) made of a coating composition which is based on a titanium-doped diamond-like carbon
Implementation Method 2
configured to establish a mobile and electrically conductive contact between a first member and a second member
Data Source
AI summary
The invention relates to a dynamic sealing element configured to establish a mobile and electrically conductive contact between a first member and a second member, at least one of which is mobile, a sealing system configured to transfer an electrical current, and a manufacturing method of the dynamic sealing element.The dynamic sealing element (1) comprises:a sealing body (1a) comprising an electrically conductive polymer composite, at least on an outer surface thereof intended to face the at least one mobile member;an interlayer (3) comprising a first sublayer (31) of titanium and a second sublayer (32); anda coating layer (2) directly contacting the second sublayer (32),wherein the coating layer (2) is based on a titanium-doped diamond-like carbon having a fixed concentration of titanium atoms of between 5% and 50%, andwherein the second sublayer (32) is a gradient layer of titanium-doped diamond-like carbon having a varying concentration of titanium atoms decreasing across a thickness of the second sublayer (32).