Investigation on thermal conductivity of silver-based porous materials by finite difference method. (December 2022)

• Record Type: Journal Article
• Authors: Xiong, Ziming; Wang, Xudong; He, Mu; Benabou, Lahouari; Feng, Zhiqiang
• Is Part Of: Materials today communications. Volume 33(2022)
• Publication Date: 2022-12
• Subjects: Equivalent thermal conductivity -- Finite difference method -- Voxelization -- Porous media -- Sintered silver; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104897
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Porous materials are widely used in the electronics industry and biomedical fields, where sintered silver, as an emerging representative of porous media, is a promising chip-connection material for adoption in third-generation power electronics. One of the important parameters to characterize the heat conduction capacity of porous sintered silver is the thermal conductivity. In this paper, a numerical model for calculating the equivalent thermal conductivity of porous silver is proposed, based on a voxelized mesh, using finite difference method (FDM) instead of the commonly used finite element method (FEM). Comparisons between the two methods are carried out for the classical unit cells such as simple cubic, body-centered cubic, and face-centered cubic, as well as the silver-based stochastic model. The developed finite difference algorithm is valid, and consistent results are obtained. Graphical abstract: