Publication Date:
2019-07-13
Description:
The thermal conductivity of electron beam-physical vapor deposited (EB-PVD) Zr02-8wt%Y2O3 thermal barrier coatings was determined by a steady-state heat flux laser technique. Thermal conductivity change kinetics of the EB-PVD ceramic coatings were also obtained in real time, at high temperatures, under the laser high heat flux, long term test conditions. The thermal conductivity increase due to micro-pore sintering and the decrease due to coating micro-delaminations in the EB-PVD coatings were evaluated for grooved and non-grooved EB-PVD coating systems under isothermal and thermal cycling conditions. The coating failure modes under the high heat flux test conditions were also investigated. The test technique provides a viable means for obtaining coating thermal conductivity data for use in design, development, and life prediction for engine applications.
Keywords:
Composite Materials
Type:
NASA/TM-2000-210238
,
E-12357
,
NAS 1.15:210238
,
Metallurgical Coatings and Thin Films; Apr 10, 2000 - Apr 14, 2000; San Diego, CA; United States
Format:
application/pdf
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