Measurement and Prediction of the Thermal and Electrical Conductivity of Al-Zr Overhead Line Conductors at Elevated Temperatures

Küçük Resim Yok

Tarih

2019

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Univ Fed Sao Carlos, Dept Engenharia Materials

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

In the present work, the thermal conductivity and electrical resistivity of the Al-0.25 Zr (wt.%) alloy have been investigated from 300 K to 600 K. The variations of thermal conductivity (K-total) with temperature were measured by using a radial heat flow furnace. The electrical resistivity (rho) measurements of the alloy depending on the temperature were performed using the standard four-point probe method. The electrical conductivity (sigma) was obtained by using the measured electrical resistivity. The thermal conductivity and the electrical resistivity coefficients were determined from the graphs of thermal and electrical resistivity versus temperature for the alloy. The electronic thermal conductivity (K-e) values were obtained from the Wiedemann-Franz and Smith-Palmer equations, and the values of K-L were obtained by subtracting K-e fromthe measured values (K-total). K-total is dominated by Ke, and K-e varies between 208-198 W/mK. The K-L decreases from 7.99 to 1.77 W/m K, and s varies between 1.41x10(7)-2.80x10(7) Omega(-1)m(-1) in the range of temperature 373-600 K. The enthalpy of fusion (Delta H) and the specific heat capacity (C-p) during the transformation were determined. Thermal diffusivity (alpha) changes were calculated as a function of temperature from these obtained thermal data.

Açıklama

Anahtar Kelimeler

Electrical resistivity, Electrical conductivity, Total thermal conductivity, Lattice thermal conductivity, Electronic thermal conductivity, Al-Zr Alloy

Kaynak

Materials Research-Ibero-American Journal of Materials

WoS Q Değeri

Q4

Scopus Q Değeri

Q3

Cilt

22

Sayı

1

Künye