Thermal conductivity determination in Fe78Si9B13/GNP/Epoxy composites by observation of samples and use of ad-hoc software: a new approximation methodology

Authors

  • Marcelo Ruben Pagnola Instituto de Tecnologías y Ciencias de la Ingeniería, INTECIN (UBA-CONICET), Buenos Aires, Argentina. https://orcid.org/0000-0003-1514-0287
  • Jairo Useche Facultad de Ingeniería, Universidad Tecnológica de Bolívar, Cartagena, Colombia https://orcid.org/0000-0002-9761-2067
  • Javier Faig Grupo de Materiales Avanzados, Departamento de Ingeniería Mecánica, Facultad de Ingeniería de la Universidad de Buenos Aires, Buenos Aires, Argentina https://orcid.org/0009-0004-7459-6887
  • Ricardo Martinez García Instituto de Tecnologías y Ciencias de la Ingeniería, INTECIN (UBA-CONICET), Buenos Aires, Argentina. https://orcid.org/0000-0001-7516-0517

DOI:

https://doi.org/10.32397/tesea.vol6.n2.902

Keywords:

Thermal conductivity, Thermal diffusivity, porosity, epoxy, composite, Graphene Nanoplatelets, Magnetic particles

Abstract

This study investigated the thermal conductivity (k) of composites composed of Fe78Si9B13 microparticles (weight fractions: 10%, 15%, and 25%) and graphene nanoplatelets (GNP) (weight fractions: 0%, 1.0%, and 1.5%) embedded in a transparent epoxy matrix. Nine cylindrical samples (7 mm diameter and 2 mm length) were prepared. Thermal conductivity was determined by measuring the thermal diffusivity using the flash technique and applying the relevant relationship between the two parameters. Because some samples contained pores, the measured diffusivity was corrected for porosity by using a novel method developed by the authors. This method allowed the estimation of the composite percentage porosity based on the Young's modulus (E) of the sample. This correction eliminates the influence of porosity on the calculated diffusivity value, allowing determination of the intrinsic diffusivity of the composite material. Finally, each sample's thermal conductivity was calculated using the diffusivity values. The values of the estimated parameters were compared with those determined by other well-known and established methods, and practically the same results were obtained. These comparative calculations demonstrated the efficiency of the proposed method. The results demonstrate the effectiveness of this method in correcting the effects of porosity on the thermal conductivity measurements in the studied samples.

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Published

2025-10-06

How to Cite

Thermal conductivity determination in Fe78Si9B13/GNP/Epoxy composites by observation of samples and use of ad-hoc software: a new approximation methodology. (2025). Transactions on Energy Systems and Engineering Applications, 6(2), 1-18. https://doi.org/10.32397/tesea.vol6.n2.902

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