Effects of heat treatment on thermal conductivity of highly porous copper/silver systems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The phenomenon of sintering has a significant impact on the thermal conductivity of a highly porous material. Particle diffusion greatly reduces the number of grain boundaries that are normally present in porous materials. In turn, fewer grain boundaries imply fewer sites for phonon scattering during conductive heat transfer. Therefore, during heat treatment of a highly porous material, particle diffusion accounts for a changing thermal conductivity. This occurs with no bulk densificiation of the material. In fact, SEM images show that the microstructure of a porous material changes from many individual particles with small pores between the particles to diffused particles with large pores in between large chunks of material. To model such a phenomenon, standard equations were scaled with unitless weighting functions to account for variable microstructures during heating. By weighting standard equations, the effects of microstructure could be more accurately described as a function of porosity and time.

Original languageEnglish (US)
Title of host publicationHeat Transfer, Fluid Flows, and Thermal Systems
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages979-987
Number of pages9
Volume8
ISBN (Electronic)0791843025
DOIs
StatePublished - 2007
EventASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, United States
Duration: Nov 11 2007Nov 15 2007

Other

OtherASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007
CountryUnited States
CitySeattle
Period11/11/0711/15/07

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Murtha, B. A., Kulkarni, A. K., & Singh, J. (2007). Effects of heat treatment on thermal conductivity of highly porous copper/silver systems. In Heat Transfer, Fluid Flows, and Thermal Systems (Vol. 8, pp. 979-987). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2007-43817