Additive Manufacturing of Patterned Metallic Foils via Thermal Delamination
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Solution Overview
Problem
Traditional manufacturing processes for thin foils are complex and time-consuming, and existing microelectronics manufacturing processes face issues with adhesion loss and damage due to mismatched coefficients of thermal expansion between layers, leading to delamination and waste.
Innovation Solution
A method involving the application of ink layers with differing coefficients of thermal expansion, followed by controlled heating and cooling rates to deliberately induce delamination, producing patterned metallic foils suitable for microelectronics applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional lithography processes are used to manufacture thin foils, then manufacturing precision can be maintained, but the process becomes time-consuming and complex
Solution Approach 1:
The patent replaces traditional mechanical lithography processes with a thermal field-based approach. By using controlled heating and cooling cycles that exploit differential thermal expansion coefficients between the substrate and metallic ink layer, the system achieves pattern transfer through thermal delamination rather than mechanical etching or lithography, significantly reducing manufacturing time while maintaining precision
Solution Approach 2:
The invention changes the fundamental processing parameters from room temperature mechanical/lithographic operations to elevated temperature thermal processing. By heating to specific temperatures (e.g., 80-150°C or higher depending on the material system) and controlling the thermal expansion differential, the process achieves rapid pattern formation and delamination, reducing cycle time while preserving manufacturing precision
2Adaptability or versatility
If materials with mismatched coefficients of thermal expansion are used in additive manufacturing, then material versatility is improved, but adhesion loss and delamination occur during temperature changes
Solution Approach 1:
The patent converts the harmful effect of thermal expansion mismatch, which traditionally causes delamination and adhesion loss, into a beneficial mechanism for controlled pattern transfer. By deliberately selecting material combinations with known differential CTE values and applying controlled thermal cycling, the system achieves reliable delamination of the metallic foil pattern from the substrate, transforming a reliability problem into a controllable process feature
Solution Approach 2:
The invention directly exploits thermal expansion differential as the driving mechanism for pattern formation. By heating the substrate-ink assembly to a target temperature where the metallic ink layer expands more (or less) than the substrate, and then controlling the cooling rate, the system achieves controlled delamination that produces the desired foil pattern with high reliability
3Ease of manufacture
If controlled thermal cycling is used to induce delamination, then manufacturing simplicity is improved, but precise temperature control is required
Solution Approach 1:
The patent incorporates temperature sensing and control feedback mechanisms to monitor and adjust the thermal cycling process in real-time. By using thermocouples or other temperature sensors positioned near the substrate-ink interface, the system can detect temperature deviations and adjust heating power or cooling rates to maintain the target temperature window, ensuring consistent delamination outcomes without requiring overly complex manual control
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 method enables efficient and reliable production of thin foils with controlled delamination, reducing manufacturing complexity and waste while ensuring adhesion and structural integrity.
Implementation Method 1
heating the ink layer and the substrate at a temperature increase ramp rate to a predefined target temperature for the ink layer
Implementation Method 2
cooling the metallic layer and the substrate at a temperature decrease ramp rate, wherein a difference between the substrate coefficient of thermal expansion and the metallic coefficient of thermal expansion operates to completely delaminate the metallic layer from the substrate
Data Source
AI summary
A method may apply an ink layer in a desired pattern onto a substrate with a substrate coefficient of thermal expansion. A method may heat the ink layer and the substrate at a temperature increase ramp rate to a predefined target temperature for the ink layer, to obtain a metallic layer in substantially the desired pattern and with a metallic coefficient of thermal expansion. A method may cool the metallic layer and the substrate at a temperature decrease ramp rate, wherein a difference between the substrate coefficient of thermal expansion and the metallic coefficient of thermal expansion, in combination with the temperature increase ramp rate and the temperature decrease ramp rate, operates to completely delaminate the metallic layer from the substrate, thereby producing the patterned metallic foil.