Hearing Aid Charge Contacts Gold Palladium Coating
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Solution Overview
Problem
Existing electric charge contacts in hearing aids are prone to failure due to wear and corrosion, leading to shorter lifetimes and increased costs, as they require thick gold layers for protection, which complicates soldering and poses health risks from nickel release.
Innovation Solution
The use of a metallic component with a gold-palladium coating, where the gold layer provides low electrical resistance and corrosion resistance, and the palladium layer acts as a hard outer layer for improved wear resistance and to prevent nickel release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick gold layers are used to protect electric charge contacts from corrosion, then corrosion resistance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The coating is divided into multiple functional layers: a nickel underlayer for adhesion and corrosion protection, a gold intermediate layer for electrical conductivity and corrosion resistance, and a palladium top layer for wear resistance. This segmentation allows each layer to be optimized for its specific function, achieving overall protection without requiring excessively thick gold deposits.
Solution Approach 2:
The electric charge contact uses a composite coating structure combining nickel, gold, and palladium layers. This composite material approach leverages the strengths of each material: nickel provides base corrosion resistance, gold provides electrical conductivity and corrosion protection, and palladium provides wear resistance, achieving superior overall performance without relying on thick single-material layers.
2Reliability
If thick gold layers are used to protect electric charge contacts, then corrosion resistance is improved, but production cost increases
Solution Approach 1:
The coating is divided into multiple functional layers: a nickel underlayer for adhesion and corrosion protection, a gold intermediate layer for electrical conductivity and corrosion resistance, and a palladium top layer for wear resistance. This segmentation allows each layer to be optimized for its specific function, achieving overall protection without requiring excessively thick gold deposits.
Solution Approach 2:
The electric charge contact uses a composite coating structure combining nickel, gold, and palladium layers. This composite material approach leverages the strengths of each material: nickel provides base corrosion resistance, gold provides electrical conductivity and corrosion protection, and palladium provides wear resistance, achieving superior overall performance without relying on thick single-material layers.
3Reliability
If nickel is used in the coating, then adhesion and corrosion protection are improved, but health risks increase due to nickel release
Solution Approach 1:
The nickel layer serves as an intermediary underlayer that provides adhesion and corrosion protection, while the gold and palladium top layers act as barriers that prevent nickel release. This intermediary structure allows nickel to fulfill its protective function without directly contacting the environment, eliminating health risks associated with nickel release.
Solution Approach 2:
The design uses a sacrificial nickel underlayer that protects the more valuable gold and palladium layers from corrosion and wear. The nickel layer can corrode or wear away first, sacrificing itself to protect the noble metal layers, thereby preventing nickel release while maintaining the integrity of the protective coating.
4Reliability
If gold is used as the top layer, then electrical resistance is reduced, but wear resistance decreases
Solution Approach 1:
Instead of using gold as the top layer, the patent inverts the traditional structure by placing a harder palladium layer on top of the gold layer. This inversion protects the soft, highly conductive gold layer from wear while allowing it to remain close to the surface for optimal electrical contact, solving both conductivity and wear resistance requirements.
Solution Approach 2:
The coating structure provides different properties at different depths: the gold intermediate layer provides high electrical conductivity where it is needed for charge transfer, while the palladium top layer provides wear resistance at the surface. This local quality assignment optimizes each layer's position for its specific function.
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
This configuration enhances the corrosion and wear performance of electric charge contacts, extending their lifespan and reducing costs by minimizing the need for thick gold layers, while also ensuring safer nickel-free operation.
Implementation Method 1
The first layer comprises gold... configured to provide electrical conduction
Implementation Method 2
the gold layer provides low electrical resistance and corrosion resistance
Implementation Method 3
the palladium layer acts as a hard outer layer for improved wear resistance
Data Source
AI summary
Disclosed herein are embodiments of a hearing aid. The hearing aid can include a number of electric charge contact, wherein the electric charge contact is a metallic component configured to provide electrical conduction. A coating at least partially covers the metallic component, the coating including a first layer at least partially located on the metallic component, wherein the first layer is gold, and a second layer at least partially located on the first layer, wherein the second layer is palladium.