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The thermal diffusivity or thermal barrier coatings (zirconia stabilized with 7-8 wt% yttria) deposited by air plasma spraying has been measured by the laser flash method. Free-standing samples (0.5-0.6-mm thick) polished on both sides were coated with graphite. Deduced values or thermal conductivity (e.g., 1.5 W m -1 K -1 at 200 o C in 1 atm. of nitrogen) are in...
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