Hybrid Thermal Interface Material for High-Conductivity Heat Transfer
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Solution Overview
Problem
Conventional thermal interface materials (TIMs) face challenges in achieving high thermal conductivity while avoiding surface scratching and maintaining cost-effectiveness, particularly in high-powered computing devices where heat management is critical.
Innovation Solution
A hybrid thermal interface material is developed, comprising a matrix material with diamond particles and other solid fillers, where diamond particles are engineered to be small enough to avoid scratching and are used in low concentrations to enhance thermal conductivity, achieving thermal conductivity of 6 W/(m K) or more without significant mechanical strength loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If diamond particles are used to enhance thermal conductivity, then thermal conductivity is improved, but surface scratching occurs due to the hardness and size of diamond particles
Solution Approach 1:
The patent applies parameter changes by controlling the size of diamond particles to be within a specific range (0.1-10 micrometers) and limiting their concentration to 1-10 wt.%. This parameter optimization allows the diamond particles to enhance thermal conductivity while being small enough to avoid significant surface scratching, thus resolving the contradiction between thermal performance and surface protection.
Solution Approach 2:
The patent uses composite materials by combining diamond particles with a polymer matrix material and other filler particles. This composite structure allows the diamond particles to provide thermal conductivity enhancement while the polymer matrix and other fillers provide mechanical cushioning and surface protection, preventing direct contact and scratching of the diamond particles with the mating surfaces.
2Temperature
If diamond loading is increased to improve thermal conductivity, then thermal conductivity is enhanced, but cost increases due to the high cost of diamond particles
Solution Approach 1:
The patent applies parameter changes by optimizing the diamond particle concentration to a specific range (1-10 wt.%). This optimized concentration provides sufficient thermal conductivity enhancement while avoiding excessive diamond loading that would significantly increase cost. The parameter optimization balances thermal performance with cost-effectiveness.
Solution Approach 2:
The patent uses composite materials by combining diamond particles with more cost-effective polymer matrix materials and other filler particles. This composite approach allows the expensive diamond particles to be used at lower concentrations (1-10 wt.%) while still achieving high thermal conductivity, thereby reducing overall material cost compared to using high concentrations of diamond alone.
3Strength
If large filler particles are used to maintain mechanical strength, then structural integrity is maintained, but thermal conductivity is reduced due to lower pack density
Solution Approach 1:
The patent applies segmentation by using a distribution of filler particles with different size ranges. Larger filler particles (1-100 micrometers) provide mechanical strength and structural integrity, while smaller diamond particles (0.1-10 micrometers) fill the gaps between larger particles. This size segmentation achieves high pack density for improved thermal conductivity while maintaining mechanical strength through the larger particles.
Solution Approach 2:
The patent uses composite materials by combining filler particles of different sizes and materials. The composite structure includes larger particles for mechanical strength and smaller diamond particles for thermal conductivity enhancement. This multi-component composite achieves both high mechanical strength and high thermal conductivity by leveraging the complementary properties of different particle sizes and materials.
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 hybrid TIM provides improved thermal conductivity and cost-effectiveness by using diamond particles in specific size and concentration ranges, effectively managing heat in high-powered computing devices without surface damage, outperforming conventional TIMs in heat extraction efficiency.
Implementation Method 1
thermal interface material for forming a layer conformable between a first heat transfer surface and an opposing second heat transfer surface to provide a thermal pathway therebetween
Data Source
AI summary
A thermal interface material for forming a layer conformable between a first heat transfer surface and an opposing second heat transfer surface to provide a thermal pathway therebetween includes: a matrix material composing 10 wt. % or less of the thermal interface material; a filler dispersed in the matrix material composing at least 80 wt. % of the thermal interface material, the filler including: particles of a first material having a nominal dimension in a range from 1 micron to 100 microns, the first material composing at least 40 wt. % of the thermal interface material; and diamond particles having a nominal dimension of 1,000 nm or less, the diamond particles composing 0.5 wt. % to 5 wt. % of the thermal interface material.