Dual-Coated Wire Bonding Tool Tips for Wear and Adhesion
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Solution Overview
Problem
Conventional wire bonding tools face issues with contamination and surface wear at the tool tip, limiting their usable life due to adhesion and wear, which affects the reliability and efficiency of electrical interconnections in semiconductor devices and electronics assemblies.
Innovation Solution
A wire bonding tool with a dual-coating system, where a first coating resistant to corrosion and wear (such as chromium or titanium-based coatings) is applied over a body portion, followed by a second carbon-based coating to reduce stiction and friction, using techniques like cathodic arc or chemical vapor deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a single coating is applied to the wire bonding tool tip, then the tool life is extended, but the reliability is insufficient due to simultaneous wear and adhesion issues
Solution Approach 1:
The coating system is segmented into two distinct functional layers: a first coating (e.g., chromium, titanium, or ceramic) that provides corrosion and wear resistance, and a second carbon-based coating that reduces stiction and prevents adhesion. This segmentation allows each coating to specialize in addressing one primary failure mode, thereby extending tool life while maintaining bonding reliability.
Solution Approach 2:
The invention employs a composite coating structure where two different materials are combined in a layered configuration. The first coating material (metallic or ceramic) and the second coating material (carbon-based) work synergistically to provide both wear resistance and adhesion prevention, achieving reliable performance that neither coating could provide alone.
2Device complexity
If no coating is applied to the wire bonding tool tip, then the device complexity is low, but the tool life is limited due to wear and contamination
Solution Approach 1:
The invention changes the surface parameters of the wire bonding tool tip by applying coatings with specific thickness ranges (first coating: 0.5-10 microns, second coating: 0.1-10 microns) and specific material properties. These parameter changes dramatically extend tool life while maintaining manageable device complexity through standardized coating processes.
3Strength
If a thick first coating is applied to maximize wear resistance, then the wear protection is improved, but the stiction and adhesion problems persist
Solution Approach 1:
The coating system is segmented into two distinct functional layers: a first coating (e.g., chromium, titanium, or ceramic) that provides corrosion and wear resistance, and a second carbon-based coating that reduces stiction and prevents adhesion. This segmentation allows each coating to specialize in addressing one primary failure mode, thereby extending tool life while maintaining bonding reliability.
Solution Approach 2:
Different regions of the coating system have different local qualities optimized for their specific functions. The first coating layer has high hardness and low reactivity for wear resistance, while the second carbon-based layer has low surface energy and high lubricity for adhesion prevention. Each layer's properties are locally optimized for its intended purpose.
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 dual-coating system significantly extends the tool's lifespan by preventing wear and adhesion, enhancing the durability and performance of wire bonding tools in semiconductor device packaging and electronics assembly processes.
Implementation Method 1
the first coating is resistant to at least one of corrosion and wear
Implementation Method 2
the first coating is resistant to at least one of corrosion and wear
Implementation Method 3
the second coating is resistant to at least one of stiction and friction
Implementation Method 4
the second coating is resistant to at least one of stiction and friction
Implementation Method 5
applying the first coating using at least one of cathodic arc, filtered cathodic vacuum arc, and chemical vapor deposition
Implementation Method 6
applying the first coating using at least one of cathodic arc, filtered cathodic vacuum arc, and chemical vapor deposition
Data Source
AI summary
A wire bonding tool is provided. The wire bonding tool includes a body portion including a tip portion. The wire bonding tool also includes a first coating applied to the tip portion. The wire bonding tool also includes a second coating applied to the first coating.