R. Soltani, E. Garcia, T. W. Coyle, J. Mostaghimi, University of Toronto, Toronto, ON, Canada; C. Moreau, National research council Canada, Boucherville, QC, Canada; R. S. Lima, B. R. Marple, National Research Council of Canada, Boucherville, QC, Canada
Retaining non-melted nano-particles of zirconia in the nanostructured coatings has been a challenge in the past. Recently an air plasma spray process was developed1 to produce coatings which retain more than 20% by volume non-melted particles, resulting in a unique structure. The creep/sintering behavior of such thermal barrier coatings deposited from nanostructured feedstock has been measured and compared with deposits produced from hollow sphere powder (HOSPTM). Both feedstocks contain 7-8wt% Y2O3 as stabilizer. Compression creep testing was conducted under several different loads and temperatures to obtain creep exponents and parameters. Thermal expansion and conductivity was measured as well to evaluate coating performance in high temperatures.
Summary: Recently an air plasma spray process was developed1 to produce coatings which retain more than 30-35% by volume non-melted particles, resulting in a unique structure. The creep/sintering behavior of such thermal barrier coatings deposited from nanostructured feedstock has been measured and compared with deposits produced from hollow sphere powder (HOSPTM).
