Double-Layer Heat Exchange Wall With Iron Interphase Bonding
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Solution Overview
Problem
Existing double-layer heat exchange walls suffer from reduced thermal conductivity due to gaps between layers, and lack effective resistance to fatigue defects, posing safety risks in applications with reactive fluids.
Innovation Solution
A manufacturing method involving interposing a pure iron interphase between layers, followed by mechanical pressing, welding, and hot isostatic compression to create a uniform mechanical junction, ensuring excellent thermal conductivity and crack deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is left between the two layers of the double-layer heat exchange wall, then detection of fluid piercing is enabled, but thermal conductivity is reduced
Solution Approach 1:
A detection layer is introduced as an intermediary between the first and second layers. This detection layer fills the gap completely and enables fluid detection through its porous structure, while maintaining thermal conductivity through intimate contact with adjacent layers. The detection layer acts as a mediator that provides both detection functionality and thermal pathway.
2Temperature
If the gap between layers is filled to improve thermal conductivity, then thermal performance improves, but detection capability is lost
Solution Approach 1:
The detection layer is made with a porous structure that allows fluid to pass through and be detected. The porosity enables detection functionality while the material composition and structure maintain sufficient thermal conductivity. The porous structure allows fluid molecules to penetrate and trigger detection mechanisms.
3Reliability
If a mechanical clearance is maintained between layers, then detection systems can function, but the structure cannot respond effectively to simultaneous piercing
Solution Approach 1:
The detection layer merges the detection function with the structural integrity function. By filling the gap completely and creating intimate contact between layers, the detection layer becomes part of the load-bearing structure, enabling effective response to simultaneous piercing while maintaining detection capability.
4Strength
If braided wires are interposed in the gap, then structural connection is achieved, but thermal conductivity remains penalized
Solution Approach 1:
The detection layer uses composite material structure that combines structural support capability with high thermal conductivity. Unlike braided wires which create thermal resistance, the composite detection layer material provides both mechanical connection and thermal pathway through its homogeneous structure and intimate contact with adjacent layers.
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 produces a double-layer wall with enhanced thermal conductivity and extended fatigue life, preventing crack propagation and maintaining integrity under mechanical stress.
Implementation Method 1
This metallic interphase also makes it possible to give the double-layer wall excellent thermal conductivity properties by ensuring very good heat transfer between the first and second layers
Implementation Method 2
step (v) of heat treatment of the welded assembly obtained at the end of step (iv), this heat treatment step being carried out by hot isostatic pressing (HIP) conducted at a temperature between 800°C and 1200°C, at a pressure between 10^8 Pa and 10^10 Pa
Data Source
Figure 1~2
AI summary
The invention relates to a method for manufacturing a double-layered heat exchange wall comprising first and second metal layers. This method comprises the following successive steps: (i) providing a first metal sheet intended to form the first layer, a second metal sheet intended to form the second layer, and a strip of iron Fe° having a thickness of between 10 μm and 100 μm; (ii) assembling the first and second metal sheets and the strip of iron Fe°, the strip being inserted between the first and second metal sheets; (iii) mechanically pressing the assembly obtained at the end of the preceding step under a minimum pressure of 1 MPa; (iv) peripherally welding the pressed assembly obtained at the end of step (iii); and (v) thermally treating the welded assembly obtained at the end of step (iv), this thermal treatment being carried out by hot isostatic compression conducted at a temperature of between 800°C and 1200°C, at a pressure of between 108 Pa and 2.108 Pa, for a duration of between 1 h and 3 h.