Fluorine-Dispersed Gold Joint Structure for Stress-Resistant Bonding
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Solution Overview
Problem
Existing joint structures in electronic devices face challenges with stress concentration at metal joint layers due to thermal stress and external vibrations, leading to potential crack formation and moisture invasion, which compromises connection reliability.
Innovation Solution
A joint structure with a gold joint layer and a fluorine-containing film, where the metal joint layer is thinner than the flatness of the surfaces it connects, dispersing fluorine to prevent moisture invasion and distribute stress effectively, and a method for manufacturing this structure involving mirroring, forming gold and fluorine-containing films, and ambient temperature joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal joint layer is used to join two members, then connection strength is improved, but stress concentration occurs at the joint layer leading to crack formation
Solution Approach 1:
The patent changes the physical and chemical parameters of the joint layer by incorporating fluorine atoms and creating a nanoglass structure. This transforms the material properties to achieve both high strength and stress distribution, resolving the contradiction between connection strength and reliability
Solution Approach 2:
The patent creates a composite structure combining metal particles (Au, Ag, Cu, Al) with fluorine-containing glass matrix. This composite approach allows the joint layer to simultaneously provide mechanical strength from metal particles and stress distribution from the glass matrix, eliminating crack formation
2Strength
If the metal joint layer thickness is increased to improve connection strength, then joining strength is improved, but stress concentration and crack formation are exacerbated
Solution Approach 1:
The patent changes the structural parameters of the joint layer by creating a nanoglass composite structure with controlled metal particle distribution. This allows achieving high joining strength with reduced thickness while distributing stress uniformly, preventing the stress concentration that occurs in conventional thick metal layers
3Ease of manufacture
If conventional metal joint layers are used, then manufacturing simplicity is maintained, but moisture invasion occurs through cracks reducing durability
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating fluorine atoms into the joint layer structure. The fluorine creates hydrophobic properties that repel moisture, preventing moisture invasion through cracks while maintaining manufacturing feasibility through established sputtering and firing processes
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 effectively suppresses stress concentration at the metal joint layer, enhances connection reliability by preventing moisture intrusion, and improves durability fatigue strength through the use of fluorine's moisture-repellent properties.
Implementation Method 1
Fluorine is dispersed inside at least the gold joint layer included in the metal joint layer... improves durability fatigue strength through the use of fluorine's moisture-repellent properties
Implementation Method 2
suppresses stress concentration at the metal joint layer... distribute stress effectively
Data Source
AI summary
A joint structure includes a first member, a second member and a metal joint layer. The first member has including a first surface and is made of material having one of copper, copper alloy, aluminum, or aluminum alloy. The second member includes a second surface that faces the first surface of the first material. The metal joint layer includes a gold joint layer made of material having gold or gold alloy and is disposed between the first surface of the first material and the second surface of the second material. A thickness of the metal joint layer is smaller than flatness of the first surface of the first material and flatness of the second surface of the second material. Fluorine is dispersed inside at least the gold joint layer included in the metal joint layer.