Heterogeneous Copper-Tin Nanowire Thermal Interface Material
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Solution Overview
Problem
Current thermal interface materials (TIMs) fail to provide a balance between high thermal conductivity and mechanical compliance, leading to significant thermal resistance and reliability issues in electronics, particularly as power density increases, causing material fatigue and potential delamination.
Innovation Solution
A high-performance thermal interface material (HPTIM) comprising a heterogeneous copper-tin nanowire array with ultra-compliant properties, exhibiting reduced Young's and shear moduli, which effectively reduces thermal resistance and enhances long-term reliability by accommodating thermal stresses and maintaining high thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If solder TIMs are used to achieve high thermal conductivity, then thermal resistance is reduced, but mechanical compliance deteriorates due to stiff nature
Solution Approach 1:
The patent transforms the material state of solder from solid to liquid encapsulated within a flexible polymer matrix. This parameter change allows the TIM to maintain high thermal conductivity (approaching solid solder) while gaining the mechanical compliance of liquid encapsulation, resolving the contradiction between thermal performance and mechanical adaptability
Solution Approach 2:
The invention creates a composite TIM structure combining solder particles/liquid metal with a flexible polymer matrix. This composite approach integrates the high thermal conductivity of metal components with the mechanical compliance and stress-absorbing capabilities of the polymer, simultaneously achieving both improved thermal management and enhanced mechanical adaptability
2Adaptability or versatility
If polymer-based TIMs are used to achieve high mechanical compliance, then stress accommodation is improved, but thermal conductivity deteriorates to order of 1 W/m·K
Solution Approach 1:
The patent develops a composite TIM where high-thermal-conductivity solder particles or liquid metal are dispersed within a flexible polymer matrix. This composite structure combines the mechanical compliance of the polymer with the high thermal conductivity of the metal components, achieving both stress accommodation and effective heat transfer
Solution Approach 2:
The invention applies local quality by concentrating high thermal conductivity materials (solder/liquid metal) at specific locations where heat transfer is most critical, while the surrounding polymer matrix provides mechanical compliance. This localized distribution optimizes both thermal and mechanical properties in different regions of the TIM
3Temperature
If copper nanowires are used to achieve high thermal conductivity of 70 W/m·K, then thermal resistance is reduced, but mechanical compliance deteriorates due to crosslinks between nanowires
Solution Approach 1:
The patent changes the structural parameters of nanowire arrays by controlling their density, length, and interconnections. By optimizing these parameters, the TIM achieves sufficient thermal conductivity while maintaining mechanical compliance through controlled flexibility and stress distribution across the nanowire network
Solution Approach 2:
The invention utilizes a porous or loosely interconnected nanowire structure that allows for mechanical compliance while maintaining thermal conduction pathways. The porous architecture enables stress absorption and material compliance while preserving enough nanowire connectivity to achieve high thermal conductivity
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 HPTIM achieves a two-fold reduction in thermal resistance and demonstrates exceptional long-term reliability with over 1,280 thermal cycles, enabling electronic systems to operate at lower temperatures or higher performance with higher power density.
Implementation Method 1
a heterogeneous copper-tin nanowire array that is ultra-compliant... capable of reducing the thermal resistance
Implementation Method 2
high mechanical compliance for accommodating the thermal stress generated due to mismatch in coefficients of thermal expansion
Implementation Method 3
exhibiting a Young's modulus 2-3 orders of magnitude lower, and a shear modulus 3-4 orders of magnitude lower than traditional solders
Data Source
AI summary
A high-performance thermal interface material comprising a heterogeneous copper-tin nanowire array that is ultra-compliant and that can reduce thermal resistance by two times as compared with the state-of-the-art thermal interface materials. The high-performance thermal interface material can be further used in electronic systems, ranging from microelectronics to portable electronics to massive data centers, to operate at lower temperatures, or at the same temperature but with higher performance and higher power density.