Liquid Metal Mesh Interface for Leak-Resistant Die Cooling
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Solution Overview
Problem
Existing heat radiation structures using liquid metal for semiconductor chips face challenges in preventing leakage while maintaining high heat transfer performance, especially under conditions of vibration and impact, such as in portable electronic devices.
Innovation Solution
A heat radiation structure that incorporates a porous material, like a mesh, with varying material density between its central and peripheral portions, where the peripheral portion has a higher density to prevent leakage and the central portion has a lower density for enhanced heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the material density of the mesh is increased to suppress leakage of liquid metal, then leakage prevention is improved, but heat transfer performance is deteriorated
Solution Approach 1:
The mesh structure implements different material densities in different regions: the peripheral portion has higher material density to prevent liquid metal leakage, while the central portion has lower material density to maintain heat transfer performance. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Loss of energy
If the material density of the mesh is decreased to enhance heat transfer performance, then heat transfer is improved, but leakage suppression is worsened
Solution Approach 1:
The mesh structure implements different material densities in different regions: the peripheral portion has higher material density to prevent liquid metal leakage, while the central portion has lower material density to maintain heat transfer performance. This local differentiation resolves the contradiction by optimizing each region for its specific function.
3Reliability
If a porous material with high material density is used to prevent liquid metal leakage, then leakage prevention is improved, but impregnation of liquid metal becomes more difficult
Solution Approach 1:
The mesh structure implements different material densities in different regions: the peripheral portion has higher material density to prevent liquid metal leakage, while the central portion has lower material density to facilitate liquid metal impregnation. This local differentiation resolves the contradiction by optimizing each region for its specific function.
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 structure effectively prevents liquid metal leakage while maintaining high heat transfer efficiency by utilizing capillary action in the peripheral high-density area and ensuring a larger impregnation amount in the central low-density area.
Implementation Method 1
the material density is high in the peripheral portion of the mesh, a capillary action takes place, and the leakage of the liquid metal can be further prevented
Implementation Method 2
the liquid metal has higher heat transfer property than the grease having the heat transfer property, and can effectively transfer heat from the die to the heat radiation element
Data Source
AI summary
A heat radiation structure includes a vapor chamber provided along a surface of a die, a mesh interposed between the die and the vapor chamber, and a liquid metal impregnated in the mesh. In the mesh, a peripheral portion has a higher material density per unit volume than a central portion. In the mesh, the central portion may be formed of a single layer, and the peripheral portion is formed of two layers. The mesh may be a resin material.