Heat Sink Roughness Edge for Clean TIM Removal
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Solution Overview
Problem
Thermal interface materials (TIM) used in information handling systems are difficult to remove from heat sinks without causing damage, leading to single-use disposal and hindering reuse or recycling.
Innovation Solution
Creating a roughness edge around the heat sink by treating sections of the base layer with varying surface roughness and widths to reduce adhesion force, allowing TIM to be easily and cleanly removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If TIM is applied to heat sink with smooth surface, then heat transfer efficiency is improved, but TIM becomes difficult to remove and causes damage
Solution Approach 1:
The base layer is designed with non-uniform surface roughness: a first region with lower surface roughness (first roughness value) where TIM contacts the heat sink for optimal thermal conduction, and a second region with higher surface roughness (second roughness value) that facilitates TIM removal. This local differentiation resolves the contradiction by providing smooth contact surfaces for heat transfer while creating a rougher release surface for easy removal.
2Reliability
If TIM adhesion to heat sink is increased, then thermal contact is improved, but TIM cannot be reused due to damage during removal
Solution Approach 1:
The base layer creates different local adhesion characteristics: the first region provides strong adhesion for reliable thermal contact between TIM and heat sink, while the second region provides reduced adhesion that allows clean TIM removal without damage. This enables TIM reuse while maintaining thermal contact reliability during operation.
3Productivity
If TIM is designed for strong bonding, then heat transfer performance is improved, but disposal becomes necessary due to removal difficulty
Solution Approach 1:
The base layer structure creates spatially varying bonding characteristics that enable strong TIM bonding during operation for optimal heat transfer performance, while allowing easy TIM release during maintenance. This eliminates the need for disposal and enables TIM reuse, improving both productivity and ease of manufacture.
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
Enables the clean and efficient removal of TIM from heat sinks, facilitating reuse and recycling by reducing the adhesion force and minimizing damage during removal.
Implementation Method 1
one or more of the width and the surface roughness of each treated section of the plurality of treated sections is based on the TIM
Data Source
AI summary
In one or more embodiments, a method for applying a thermal interface material (TIM) to a heat sink involves treating a plurality of sections of a base layer around at least a portion of a perimeter of the heat sink to form a continuous roughness edge and positioning the TIM relative to the heat sink such that the TIM extends for contact with the roughness edge. The roughness edge is based on reducing the adhesion force between the TIM and the base layer, wherein the TIM is easier to remove from the roughness edge, resulting in easier and cleaner removal of the TIM from the heat sink.