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Vapor Chamber Introduction

A vapor chamber is a vacuum vessel with a wick structure lining the inside walls that is saturated with a working fluid. As heat is applied, the fluid at that location immediately vaporizes and the vapor rushes to fill the vacuum. Wherever the vapor comes into contact with a cooler wall surface it will condense, releasing its latent heat of vaporization. The condensed fluid returns to the heat source via capillary action, ready to be vaporized again and repeat the cycle. The capillary action of the wick enables the vapor chamber to work in any orientation with respect to gravity.(from Thermacore)

 

Comparsion of Vapor Chamber and Heat Pipe

Vapor chambers and heat pipes are based on the same theory. In a heat pipe, heat transmission is one direction and linear. In a vapor chamber, heat transmission is two direction and planar.

 

Advantage of Product

Container Material: Copper C1100

Working Fluid: Water (purified and degassed)

Wick structure:

The wick structure is formed by bonding a single layer or multiple layers copper mesh, and the porous feature is similar to copper powder sintering.

The bonded copper mesh wick structure has the following characteristics:

1. Mesh pore size is between 50 ~ 100gm
2. Wick structure can have different pore size
between the top and bottom to improve performance.
3. Wick structure can have different pore size
in different regions on the same plane.
4. Usage:
Different wick structures can be applied in the evaporation and condensation areas depending on the product requirements.
We offer two basic type for the evaporation area and nine basic types for the condensation area. These can be used in any combination.

 

 

 


Cross Section of copper mesh wick structure under SEM

Top View of copper mesh wick structure under SEM



 

Size and Shape
Up to a maximum of 400mm x 400mm in size with no any shape limitation.

Thickness
Between 3.5mm ~ 4.2mm. Can be as thin as 3mm.

Support and Strength
Copper columns are placed between the top and bottom covers for support. These can withstand pressures of up to 3.0kg/cm2.
(Internal pressure depends 130J ambient temperature.)

Holes
Through holes can be designed on the edge flange or the center of vapor chamber.

Flatness
Depending on different design, material thickness or copper columns, The flatness can be controlled in 50gm on the surface of heat source area and 100gm on the others.

Post Machining
Fins can be soldered on vapor chamber after the vapor chamber has been tested. This helps to ensure product quality while manufacture flexibility.

 

 

 

 

 







 

 

Performance Comparison

 

 

Technology Features

Microloops' vapor chamber technique is a solid mass production process. It is based on performance and quality and considers production possibility and cost.

Our technology offers the following features:

  • Compound Copper Mesh Wick structure
    Different pore size copper mesh wick can be combined within the vapor chamber depending on the feature of evaporation and condensation areas. Compound mesh wick can formed graded wick structure in a plane which is a kind of wick structure with fine pore size wick on the top and coarse pore size wick in the bottom. This is hard to achieve for sintering wick.
  • Diffusion Bonding
    This hi-end technology is used for the bonding of the vapor chamber edges, wick structures and copper columns. After bonding, leakage rate is under 9 x 10-10mbarl/sec and tensile strength is up to 3kg/cm2. It will meet quality and environmental requirements.
  • Vacuum the chamber and then Water Injection
    The vapor chamber's internal cleanliness and level of vacuum can be controlled to ensure that product quality and performance remain consistent.
  • Vacuum Induction Brazing
    This is used for brazing the water injection tube. Induction offers fast and focused heating so the brazing of the injection tube can be completed quickly. As this is carried out in a vacuum, oxidization of the container interior during brazing is prevented.
  • Leakage Testing
    To ensure that all products are properly sealed they are subjected to two tests: (1) Positive pressure testing and (2) Negative pressure testing (nitrogen leakage test).
  • Flexible and Reliable Product Design
    It can be designed for a variety of shapes and thicknesses according to the customer's requirements on cost and performance. Detailed product data can also be provided using professional laboratory equipment to speed up the product development process.
 
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