Title :
Electromagnetic properties of plasma sprayed thermal barrier coatings in terahertz range
Author :
Watanabe, M. ; Kuroda, S. ; Yamawaki, H. ; Shiwa, M.
Author_Institution :
Nat. Inst. for Mater. Sci., Tsukuba, Japan
Abstract :
Dielectric properties of yttria partially stabilized zirconia thermal barrier coatings with various pore density were investigated by terahertz time domain spectroscopy in the continuous frequency range of 0.3 ~ 1.3 THz. The real part of the refractive index was 4.2 ~ 4.8 and the value increases as the porosity decreases. It indicates the potential application of terahertz spectroscopy to inspect the microstructure of plasma sprayed coatings nondestructively.
Keywords :
dielectric materials; plasma arc sprayed coatings; porosity; refractive index; terahertz wave spectra; thermal barrier coatings; yttrium compounds; zirconium compounds; ZrO2-Y2O3; aeroengine; electromagnetic properties; frequency 0.3 THz to 1.3 THz; gas turbines; inspection; microstructure; nondestructive testing; plasma sprayed thermal barrier coatings; porosity; refractive index; terahertz time domain spectroscopy; Coatings; Dielectrics; Electrochemical impedance spectroscopy; Frequency; Microstructure; Plasma applications; Plasma density; Plasma properties; Refractive index; Thermal spraying;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5324598
