The Excellent Flexible Thermal Interface Material Based on Liquid Metal Bridging Aluminum Powders
To address the trade-off between thermal conductivity and compliance in thermal interface materials,liquid metal was introduced into the polydimethylsiloxane(PDMS)/aluminum system.This approach reduces the contact thermal resistance between spherical aluminum particles,thereby enhancing the thermal conductivity of the PDMS/aluminum composite.Concurrently,it avoids the decline in compliance typically caused by high filler content.The resultant PDMS/aluminum/liquid metal thermal interface material exhibits a thermal conductivity of 4.25 W·m-1·K-1 and outstanding compliance(elongation at break reaching 164.9%and a Young's modulus of only 174 kPa),mirroring the mechanical properties of soft biological tissues.This novel strategy provides a promising solution for the development of thermal interface materials for high-power and large-size chips,such as CoWoS wafer-level packages.
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