|
7275 |
|
Thursday, May 05, 2022, Hall G2 10:00 AM New Processes I |
|
Development of a low power plasma reactor for the local deposition of YSZ thermal barrier coatings at atmospheric pressure |
|
Sandra Segondy* / Chimie ParisTech (IRCP), France Catherine Rio / ONERA, DMAS, Université Paris-Saclay, France Stéphane Landais/ ONERA, DMAS, Université Paris-Saclay, France Cédric Guyon/ Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), France Frédéric Rousseau/ Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), France |
|
Repair methods are of great interest for the aeronautic industry, especially for turbines. Deposition techniques that can quickly and easily repair small and localized damaged areas of Thermal Barrier Coatings (TBC) located on combustion chambers could be economically interesting. In a first approach, a Low-Power Plasma Reactor (LPPR) working at low pressure (< 1000 Pa, 240 W) was tested to locally deposit performant Yttria Stabilized Zirconia (YSZ) as TBC. However, vacuum was more difficult to implement at an industrial scale. For this reason, a new version of LPPR (< 1 kW) working at atmospheric pressure with solution precursors was investigated. The precursors were injected in the plasma afterglow to be sprayed and deposited onto parts of combustion chambers. Because the afterglow temperature was colder than for most thermal spray processes, the spray distance was lower than 10 mm. So the YSZ deposition could be done locally in hard-to-reach regions. The YSZ coating characteristics were studied by FTIR and SEM analyses. For example, the YSZ coatings exhibited the expected stoichiometry, a precursor conversion of 98 mol%, a good adherence and a porosity evaluated around 30 vol%. In addition, the thickness of the YSZ coating could be higher than 200 µm. |