Theoretical prediction of interfacial thermal conductance at high temperature across solid-solid interfaces

TL;DR

This paper introduces a theoretical model to predict high-temperature interfacial thermal conductance between dissimilar solids, treating the interface as an amorphous layer and aligning predictions with experimental data.

Contribution

A novel model that estimates interfacial thermal conductance at high temperatures without extensive calculations, using the interface as an amorphous layer and focusing on coordination number density.

Findings

Predicted ITC range at 300K: 10^7 to 10^9 W/m^2K

Model aligns well with experimental measurements

Simplifies high-temperature ITC estimation

Abstract

The existed theories and methods for calculating interfacial thermal conductance of solid-solid interface lead to diverse values that deviate from experimental measurements. In this letter, We propose a model to estimate the ITC at high temperature without comprehensive calculations, where the interface between two dissimilar solids can be treated as an amorphous thin layer and the coordination number density across interface becomes a key parameter. Our model predicts that the ITCs of various interfaces at 300K are in a narrow range: 10$^{7}$W m$^{-2}$K$^{-1}$ $\sim $10$^{9}$ W m$^{-2}$ K$^{-1}$, which is in good agreement with the experimental measurement.