Connector Pair Silver Plating Hardness Control
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Solution Overview
Problem
Existing connector pairs with silver or silver alloy plating layers face issues of high contact resistance due to abrasion and reduced conductivity, as soft plating layers are easily worn down, while hard plating layers have elevated resistance and reduced contact area.
Innovation Solution
A connector pair design where the second contact portion has a silver or silver alloy plating layer with Vickers hardness between 120Hv and 180Hv, exceeding the hardness of the first contact portion, allowing for low contact resistance and reduced abrasion, ensuring stable conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft silver plating layer is used, then contact resistance is low, but the plating layer is easily abraded
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Vickers hardness of the silver or silver alloy plating layer to fall within the range of 70Hv to 120Hv. This optimized hardness parameter enables the plating layer to simultaneously achieve low contact resistance (electrical performance) and resistance to abrasion (mechanical durability), resolving the contradiction between softness for conductivity and hardness for wear resistance
Solution Approach 2:
The patent employs composite material strategy by using silver or silver alloy plating layers with specifically controlled composition and hardness characteristics. The silver-based composite plating provides both the electrical conductivity of soft metals and the wear resistance achieved through controlled hardness, effectively combining the benefits of both soft and hard materials
2Strength
If a hard silver plating layer is used, then abrasion resistance is improved, but contact resistance increases
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal upper limit for hardness at 120Hv. By controlling the Vickers hardness within 70Hv to 120Hv, the plating layer maintains sufficient hardness to resist abrasion while preserving the softness necessary for low contact resistance and good electrical conductivity, thus balancing both requirements
3Reliability
If the plating layer is too soft, then contact resistance is low, but the base metal is easily exposed due to abrasion
Solution Approach 1:
The patent addresses this issue by optimizing the hardness parameter to 70Hv-120Hv, which provides sufficient mechanical durability to prevent premature exposure of the base metal through abrasion, while simultaneously maintaining the electrical performance characteristics of soft silver plating. This controlled hardness range ensures long-term protection of the base metal
Data Source
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AI summary
A connector pair comprises a first connector and a second connector which are mateable with each other. The first connector includes a first contact having a first contact portion which has a first plating layer made of silver or silver alloy. The second connector includes a second contact having a second contact portion which has a second plating layer made of silver or silver alloy. The second contact portion has a contact start point and a final contact point. The second plating layer has Vickers hardness not less than 120Hv but not more than 180Hv. The Vickers hardness of the second plating layer is larger than Vickers hardness of the first plating layer. When the first connector and the second connector are mated with each other, the first contact portion slides on the second contact portion from the contact start point to the final contact point.