Nanometer Capillary Layer for Thin Vapor Chamber
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Solution Overview
Problem
Conventional vapor chambers with sintered capillary structures are not suitable for extremely thin designs as they become thickened and lose capillary attraction, while mesh or channeled structures fail to provide adequate capillary attraction and structural integrity, leading to issues with heat transfer and structural strength.
Innovation Solution
A thin-type two-phase fluid device comprising a first and second plate body with a nanometer capillary layer formed from a mixture of powders of different sizes, attached to the plate bodies via a polymer layer, allowing for a total thickness of ≤0.25 mm and enabling bendability and flexibility without compromising capillary attraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sintered capillary structure is used in conventional vapor chambers, then capillary attraction is provided for liquid working fluid circulation, but the structure becomes thickened and cannot be applied to extremely thin vapor chamber structures
Solution Approach 1:
The patent changes the particle size parameter of the sintered powder to nanometer scale (1-100 nm), which fundamentally alters the capillary structure properties. This enables the formation of effective capillary channels at extremely thin thickness (≤0.25 mm) while maintaining sufficient capillary attraction for liquid working fluid circulation, resolving the contradiction between capillary function and thickness reduction.
Solution Approach 2:
The patent uses composite materials by combining nanometer-scale metal powders with polymer materials to form the capillary structure. This composite approach enables the structure to achieve both the required capillary attraction and extreme thinness, while also improving flexibility and bendability compared to conventional sintered structures.
2Reliability
If sintered capillary structure is used, then capillary attraction is achieved, but the vapor chamber cannot be folded or flexed as the sintered body will break and detach
Solution Approach 1:
The patent employs thin film technology by creating a nanometer-scale capillary structure that can be integrated into flexible vapor chamber designs. The extremely thin structure (≤0.25 mm) with nanometer particles allows the vapor chamber to be bent and flexed without breaking the capillary structure, as the fine particles can accommodate deformation while maintaining capillary function.
Solution Approach 2:
By changing the particle size to nanometer scale, the patent fundamentally alters the mechanical properties of the sintered structure. The nanometer-scale particles create a more flexible and deformable capillary network compared to conventional larger particles, enabling the vapor chamber to be folded or flexed without structural failure.
3Adaptability or versatility
If mesh body or woven mesh is used as capillary structure, then bendability is improved, but adequate capillary attraction cannot be provided and total thickness cannot be further reduced
Solution Approach 1:
The patent changes the fundamental parameter of particle size to nanometer scale, which creates vastly superior capillary attraction compared to mesh structures. The nanometer-scale capillary channels provide much stronger capillary forces due to the smaller channel dimensions, while the thin film structure maintains bendability, resolving both contradictions simultaneously.
Solution Approach 2:
The patent uses porous materials at the nanometer scale to create the capillary structure. This porous nanometer structure provides extremely strong capillary attraction due to the small pore sizes, while the overall thin structure maintains flexibility and bendability, overcoming the limitations of mesh bodies.
4Length of stationary object
If channeled structure is used to reduce thickness, then thickness is reduced, but structural strength is weakened and the wall is apt to break
Solution Approach 1:
The patent changes the capillary structure scale to nanometer level, which enables the formation of effective capillary channels within the plate body thickness without requiring external channeled structures. This internal nanometer-scale capillary network provides both the required thickness reduction and maintains structural strength, as the nanometer particles are distributed throughout the material matrix.
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 device achieves effective capillary attraction and heat transfer while maintaining structural integrity, allowing for the creation of extremely thin vapor chambers that can be bent without breaking the capillary structure, thus overcoming the limitations of conventional designs.
Implementation Method 1
the nanometer capillary layer (14) formed from a mixture of multiple kinds of powders with different sizes... providing capillary attraction
Implementation Method 2
two-phase fluid (vapor and liquid) circulation can be carried out in the vacuumed airtight chamber to achieve better heat transfer efficiency
Implementation Method 3
The polymer layer (13) is selectively connected with the first plate body (11) or the second plate body (12)
Implementation Method 4
the chamber is vacuumed to form the vapor chamber... In the vacuumed environment, the boiling point of the working liquid is lowered
Data Source
AI summary
A thin-type two-phase fluid device includes a first plate body, a second plate body and a polymer layer. The first plate body has a first face, a second face and multiple bosses. The bosses are disposed on the first face and raised therefrom. The second plate body has a nanometer capillary layer on one face. The nanometer capillary layer is formed from a mixture of multiple kinds of powders with different sizes. The nanometer capillary layer is attached to a surface of the second plate body opposite to the first face of the first plate body. The polymer layer is selectively connected with the first plate body or the second plate body. The total thickness of the thin-type two-phase fluid device is equal to or smaller than 0.25 mm, whereby the object of thinning the heat dissipation device is achieved.