Titanium Heat Pipe with Ceramic Coating for Electromagnetic Devices
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Solution Overview
Problem
Conventional heat pipes made of copper generate additional heat when exposed to high-frequency electromagnetic fields, leading to reduced power conversion efficiency and increased temperatures in electromagnetic power conversion devices, limiting the power density and thermal management effectiveness.
Innovation Solution
The use of heat pipe assemblies formed from materials with significantly lower electrical conductivity than copper, such as titanium, coated with high thermal conductivity ceramic insulation via electrophoretic deposition, which are conformally fitted to match the shape of electromagnetic power conversion devices, allowing direct contact with conductive components and efficient heat transfer through phase-change heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional copper heat pipes are used for thermal management, then heat transfer capability is improved, but additional heat is generated in high-frequency electromagnetic fields reducing power conversion efficiency
Solution Approach 1:
The heat pipe assembly uses a composite structure combining titanium (low electrical conductivity) for the heat pipe body and ceramic material (high thermal conductivity) for the coating layer. This composite material approach allows the heat pipe to maintain effective thermal management while minimizing electromagnetic field interference and energy loss in high-frequency electromagnetic environments.
Solution Approach 2:
The invention changes the material parameters by selecting titanium instead of copper for the heat pipe body, fundamentally altering the electrical conductivity parameter from high to low. This parameter change eliminates the generation of additional heat in high-frequency electromagnetic fields while maintaining the heat pipe's thermal management function through the ceramic coating.
2Temperature
If copper heat pipes are used to manage heat, then thermal conductivity is improved, but weight increases compared to lighter materials
Solution Approach 1:
The heat pipe assembly employs a composite structure with titanium as the base material and ceramic coating as the functional layer. Titanium provides sufficient thermal conductivity for heat management while being significantly lighter than copper, and the ceramic coating enhances the thermal performance, achieving optimal balance between weight and thermal conductivity.
Solution Approach 2:
The ceramic coating is applied locally on the surface of the titanium heat pipe body, providing high thermal conductivity only where needed for heat transfer, while the bulk titanium structure maintains low weight. This local quality enhancement allows the heat pipe to achieve copper-like thermal performance with fraction of the weight.
3Temperature
If heat pipe assemblies are placed in direct contact with conductive components, then heat transfer efficiency is improved, but electrical isolation must be maintained
Solution Approach 1:
The heat pipe assembly uses a composite structure where the titanium body provides thermal contact with conductive components while the ceramic coating layer provides electrical isolation. This composite material approach allows direct thermal contact for efficient heat transfer while maintaining electrical insulation, resolving the contradiction between heat transfer efficiency and electrical isolation reliability.
Solution Approach 2:
The ceramic coating acts as an intermediary layer between the titanium heat pipe body and the conductive components. This intermediary provides the dual function of maintaining electrical isolation while allowing thermal energy to pass through, enabling direct contact heat transfer without compromising electrical insulation.
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
This solution enhances thermal performance while maintaining electrical isolation, reducing weight, and improving power density by effectively managing heat without generating additional heat, thus increasing the efficiency of electromagnetic power conversion devices.
Implementation Method 1
The porous wick linings of the walls are configured to hold a liquid phase of a working fluid in the interior chamber
Implementation Method 2
heat from the conductive component vaporizes the working fluid in the porous wick lining of the at least one wall
Implementation Method 3
heat from the conductive component vaporizes the working fluid in the porous wick lining of the at least one wall and the working fluid condenses
Implementation Method 4
the working fluid condenses at or within the porous wick lining of at least one other wall to cool the conductive component of the electromagnetic power conversion device
Implementation Method 5
the working fluid condenses at or within the porous wick lining of at least one other wall to cool the conductive component
Implementation Method 6
an insulating layer coupled with at least one of the walls on a side of the at least one wall that is opposite of the porous wick lining of the at least one wall
Data Source
AI summary
A heat pipe assembly includes walls having porous wick linings, an insulating layer coupled with at least one of the walls, and an interior chamber sealed by the walls. The linings hold a liquid phase of a working fluid in the interior chamber. The insulating layer is directly against a conductive component of an electromagnetic power conversion device such that heat from the conductive component vaporizes the working fluid in the porous wick lining of the at least one wall and the working fluid condenses at or within the porous wick lining of at least one other wall to cool the conductive component of the electromagnetic power conversion device. The assembly can be placed in direct contact with the device while the device is operating and/or experiencing time-varying magnetic fields that cause the device to operate.