Vapor Chamber Post Welding for Thin-Body Strength and Heat Transfer
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Solution Overview
Problem
Conventional vapor chambers face challenges in structural strength and heat dissipation due to their thin design, which can lead to deformation or cracking under high temperatures, and existing reinforcement methods can be brittle during manufacturing.
Innovation Solution
A method of fabricating a vapor chamber involving pressure welding of posts to a capillary structure within the chamber, enhancing both structural strength and heat conduction, while controlling temperature and pressure to prevent cracking and ensure accurate thickness changes during the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the vapor chamber main body is made thin to reduce weight and size, then the vapor chamber can meet lightweight and small electronic product requirements, but the structural strength is insufficient and the vapor chamber deforms or cracks under high temperature and pressure
Solution Approach 1:
The vapor chamber main body is divided into two thin cover plates (first cover and second cover) that are pressure-welded together to form a chamber. This segmentation allows each cover to remain thin for weight reduction while the assembled structure provides sufficient strength.
Solution Approach 2:
The vapor chamber employs a composite structure combining thin cover plates with integrated posts formed on the covers. The posts act as reinforcement elements within the composite structure, providing structural strength while maintaining the thin profile of the overall vapor chamber.
2Strength
If support posts are added to the chamber to reinforce structural strength, then the vapor chamber can resist deformation and cracking, but the vapor chamber becomes easily cracked during the manufacturing process
Solution Approach 1:
The posts are pre-formed on the cover plates before the pressure welding process. This preliminary action ensures the posts are properly positioned and integrated into the structure before final assembly, reducing the risk of cracking during manufacturing.
Solution Approach 2:
The posts are integrated directly with the cover plates through pressure welding, merging the reinforcement elements with the main body in a single manufacturing process. This integration eliminates separate assembly steps that could cause cracking.
3Temperature
If the vapor chamber is heated over 90°C to improve heat dissipation performance, then the heat dissipation efficiency increases, but the internal pressure exceeds the limit and causes deformation or cracking
Solution Approach 1:
Dividing the vapor chamber into two thin pressure-welded covers creates a more uniform stress distribution across the structure, allowing the chamber to better withstand internal pressure at elevated temperatures without deformation or cracking.
4Reliability
If posts are pressure welded to the capillary structure, then heat conduction is enhanced through both posts and capillary structure, but cracking may occur during pressure welding
Solution Approach 1:
The posts are pre-formed on the cover plates before pressure welding to the capillary structure. This preliminary positioning ensures proper alignment and reduces stress concentration during the welding process, preventing cracking while achieving good thermal contact.
Solution Approach 2:
The pressure welding process simultaneously joins the covers to form the chamber and welds the posts to the capillary structure, merging multiple functions into a single process that enhances heat conduction without causing cracking.
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 method improves the structural integrity and heat transfer efficiency of the vapor chamber by ensuring full pressure welding of posts to the capillary structure, preventing cracking and enhancing fabrication quality.
Implementation Method 1
Pressure welding the first cover and the second cover so as to form a chamber between the first cover and second cover
Implementation Method 2
Thermal conduction of a heat pipe occurs in one dimension while thermal conduction of a vapor chamber occurs in two dimensions
Implementation Method 3
The working fluid absorbs heat and will be vaporized to gaseous form in the evaporation part
Implementation Method 4
the working fluid in gaseous form diffuses into the condensation part and will be condensed into liquid state
Data Source
AI summary
This disclosure relates to a method for fabricating a vapor chamber. The method includes positioning a capillary structure on a first cover, forming an accommodation space, a flow channel, and a plurality of posts on a first surface of a second cover, covering the first cover with the second cover, positioning the first cover and the second cover such that the plurality of posts are spaced apart from the capillary structure by a distance, and pressure welding the first cover and the second cover so as to form a chamber between the first cover and second cover and a passage connected to the chamber and to pressure weld the plurality of posts with the capillary structure.