Anisotropic Graphite Surface Holes for Adhesion
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Solution Overview
Problem
Anisotropic graphite composites with low surface activity, such as those joined with a titanium-containing metal layer, often exhibit insufficient adhesion and lack long-term reliability due to poor bonding, leading to inadequate thermal conduction and heat dissipation in semiconductor packages.
Innovation Solution
Creating anisotropic graphite with specific surface features, including numerous holes (over 1000 per square millimeter) with diameters between 0.1 μm and 20 μm and depths of at least 1 μm, which enhances the anchor effect and improves adhesion with joining materials like titanium-containing metal layers, thereby enhancing thermal conduction and long-term reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anisotropic graphite is joined with a titanium-containing metal layer using conventional methods, then thermal conduction is achieved, but adhesion is insufficient and long-term reliability is poor
Solution Approach 1:
The patent applies porous material principle by forming numerous holes (more than 1000 per square millimeter) with specific dimensions (diameter 0.1-20 μm, depth at least 1 μm) on the surface of anisotropic graphite. These holes create an anchor effect that mechanically interlocks the joining material, significantly improving adhesion strength and long-term reliability of the bonded structure.
Solution Approach 2:
The patent transitions from a two-dimensional surface bonding interface to a three-dimensional anchored interface by creating holes that extend into the graphite surface. This dimensional change allows the joining material to penetrate and anchor within the graphite structure, enhancing bond strength beyond simple surface adhesion.
2Strength
If the surface of anisotropic graphite is modified to improve adhesion, then bonding strength increases, but thermal conduction property may be compromised
Solution Approach 1:
The patent applies local quality principle by creating holes only on specific surfaces of the anisotropic graphite (surfaces to be joined) while maintaining the intact crystal structure and high thermal conductivity in the bulk material and in directions parallel to the crystal orientation plane. The modification is localized to the bonding interface rather than the entire material.
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 modified anisotropic graphite composites demonstrate improved thermal conduction properties and long-term reliability, effectively dissipating heat in electronic devices by ensuring strong bonding between the graphite and joining materials.
Implementation Method 1
forming, in anisotropic graphite, a specific number of holes each having a specific size improves adhesion between the anisotropic graphite and a joining material due to the anchor effect
Implementation Method 2
Anisotropic graphite has a high thermal conductivity in the direction parallel to a crystal orientation plane of graphite and a low thermal conductivity in the direction perpendicular to the graphite crystal orientation plane
Data Source
AI summary
Provided is anisotropic graphite for producing an anisotropic graphite composite having excellent thermal conduction property and excellent long-term reliability as a heat dissipating member. Given an X axis, a Y axis orthogonal to the X axis, and a Z axis perpendicular to a plane defined by the X axis and the Y axis, and a crystal orientation plane of the anisotropic graphite is parallel to an X-Z plane, and a specific number of holes each having a specific size are formed in at least one surface out of surfaces of the anisotropic graphite which are parallel to an X-Y plane.