Determining thermal conductivity of plasma sprayed TBC by electrochemical impedance spectroscopy
Abbreviated Journal Title
Surf. Coat. Technol.
impedance spectroscopy; conductivity; plasma spraying; sintering; zirconium oxide; thermal barrier coating; ANGLE NEUTRON-SCATTERING; BARRIER COATINGS; BOND-COAT; NONDESTRUCTIVE; EVALUATION; ELECTRONIC TRANSPORT; INTERFACIAL DAMAGE; OXIDATION; STRESSES; SPALLING FAILURE; SINGLE-CRYSTALS; HEAT-TREATMENT; Materials Science, Coatings & Films; Physics, Applied
Thermal conductivity, K, of free-standing air plasma sprayed (APS) thermal barrier coatings (TBCs) after exposure at temperatures of 1100, 1200, and 1350 degreesC for 3, 10, 17, 24, and 120 h was measured using laser flash (LF) technique and differential scanning calorimeter (DSC), and correlated with the spectra of electrochemical impedance spectroscopy (EIS). High-temperature exposure of TBCs increases the thermal conductivity as well as the electrochemical conductance, C-t(T), with an increase in exposure temperature and exposure time. A linear relationship between thermal conductivity, K, and electrochemical conductance, C-t(T), has been found. The result has demonstrated that electrochemical impedance technique holds the promise enabling to assess and monitor the thermal conductivity of free-standing TBCs. (C) 2004 Elsevier B.V. All rights reserved.
Surface & Coatings Technology
"Determining thermal conductivity of plasma sprayed TBC by electrochemical impedance spectroscopy" (2005). Faculty Bibliography 2000s. 5832.