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1186 |
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Processing and properties of hybrid YSZ coating deposited by thermal plasma directed vapor deposition |
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Teddy Lavaud* / SPCTS, University of Limoges, France, France Michel Vardelle/ SPCTS, University of Limoges, France Pierre Fauchais/ SPCTS, University of Limoges, France Justine Menuey/ SNECMA Services, France |
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The aim of this study is to develop for thermal barrier applications a new process in which coatings exhibit properties between those of APS and EBPVD. This process includes two conventional D.C. plasma torches in a chamber whose pressure can vary between 0.1 and 1 atm. Micro-sized ceramics powders are injected in both plasma jets to vaporize them, at least partially, and produce finely-structured coatings from vapor and micro-droplets deposition. The torch arrangement allows separating the vapor and the very small particles (less than 1 µm) from the partially vaporised ones. The diagnostics are based on optical emission spectroscopy, pyrometry, imaging of particles trajectories and microstructural characterization. |