Composite Heat Transfer Structure for High-Temperature Resistance
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Solution Overview
Problem
Materials with high temperature resistance and thermal conductivity face challenges in managing thermal stresses and cyclical damage due to mismatched thermal expansion coefficients and melting points, leading to premature failure in high-temperature applications.
Innovation Solution
A composite structure comprising high-temperature (HT) and high-conductivity (HC) components, where HT components are oriented in longitudinal segments separated by HC components, ensuring direct contact with the hot environment and efficient heat dissipation, while the HC component connects the hot surface to the cooling channel, reducing thermal stresses and expansion differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ceramic materials or high-melting-point alloys are used to resist high temperatures, then temperature resistance is improved, but thermal conductivity deteriorates
Solution Approach 1:
The patent employs a composite material structure consisting of a ceramic matrix composite (CMC) layer and a metal matrix composite (MMC) layer. The CMC layer provides high-temperature resistance while the MMC layer with high thermal conductivity (using aluminum or magnesium alloy) ensures efficient heat dissipation. This composite structure resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The protective coating is segmented into two distinct layers: an outer CMC layer for temperature resistance and an inner MMC layer for thermal conductivity. This segmentation allows each layer to perform its specialized function, with the CMC layer bearing the thermal load and the MMC layer conducting heat away from the substrate.
2Loss of energy
If cooling channels are placed close to the hot surface to improve heat dissipation, then heat transfer efficiency is improved, but thermal stress increases
Solution Approach 1:
The bi-layer composite structure (CMC/MMC) acts as an intermediate thermal management system between the hot surface and cooling channels. The MMC layer with high thermal conductivity efficiently transfers heat from the hot surface to the cooling channels while the CMC layer buffers thermal stresses, allowing cooling channels to be positioned closer to the hot surface without excessive stress accumulation.
3Loss of energy
If materials with high thermal conductivity like copper or aluminum are used, then heat dissipation is improved, but temperature resistance deteriorates
Solution Approach 1:
The patent uses a metal matrix composite (MMC) layer with aluminum or magnesium alloy that provides high thermal conductivity for heat dissipation, combined with a ceramic matrix composite (CMC) layer that provides high-temperature resistance. This composite structure allows the system to achieve both high thermal conductivity and temperature resistance simultaneously.
4Device complexity
If a single material layer is used to provide both temperature resistance and thermal conductivity, then device complexity is reduced, but performance deteriorates
Solution Approach 1:
The protective coating is segmented into two functionally specialized layers: CMC for temperature resistance and MMC for thermal conductivity. This segmentation optimizes thermal management performance by allowing each layer to excel at its specific function, rather than requiring a single material to compromise between conflicting properties.
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 composite achieves long-term heat resistance and stability at high temperature gradients, significantly extending lifespan and reliability in applications like plasmatrons and high-temperature reactors by minimizing thermal stresses and maintaining structural integrity.
Implementation Method 1
The HC component connects the hot surface to the cooling channel, reducing thermal stresses and expansion differences
Implementation Method 2
the level of the stress is directly proportional to the difference between the temperatures between surfaces, the coefficient of the thermal expansion of the material
Data Source
AI summary
Composite for the transfer of the heat between the hot and cooled surface, whereby the composite is resistant to high temperatures, includes at least two components, one of the components is produced by longitudinal segments (1) with the melting temperature that is higher than 1300° C. and which are separated from each other by the filling (2) with the higher heat conductivity and thermal expansivity, which is in the direct contact with the cooling medium in the channel (3). Both components are in the direct contact with the hot environment surrounding the composite, whereby the overall surface formed by the segments (1) is 50 to 95% of the overall hot surface of the composite. The longitudinal axis of the segment (1) is primarily oriented in the direction of the shortest line connecting the hot surface with the cooled surface of the composite with the allowed deviation of 45° at maximum, whereby in the direction from the hot to the cooled surface it can cross one boundary between the components at maximum. The material for the segments can be tungsten, preferably tungsten with the admixtures of oxides La2O3 and/or Y2O3 and/or CeO2 and/or ThO2 and/or ZrO2. The matrix, that is, the filling (2) can be copper or silver or their alloys.