The influence of different post treatment presence on high temperature oxidation resistance of APS YSZ thermal barrier coatings
Monday, May 7, 2018
Exhibit Halls A-E (Gaylord Palms Resort )
Mrs. Alsu Akhmetgareeva
,
TSPC LLC, Scherbinka, Moscow, Russian Federation
Dr. Sergey Baldaev
,
TSPC, LLC, Scherbinka, Moscow, Russian Federation
Prof. Tat’yana Il’inkova
,
Kazan National Research Technical University named after A.N.Tupolev - KAI (KNRTU-KAI), Kazan, Russian Federation
Dr. Ivan Mazilin
,
TSPC, LLC, Scherbinka, Moscow, Russian Federation
Dr. Lev Baldaev
,
TSPC LLC, Scherbinka, Moscow, Russia
Mr. Nikolay Zaitsev
,
Technological systems for protective coatings, Moscow, Russia
Thermal barrier coatings (TBC) are used to protect gas turbine hot section parts during exposure at high temperatures, corrosion and wear. Yttria stabilized zirconia, which is usually used as a ceramic layer, is an oxygen transparent material. Therefore, special attention should be given to the bondcoat that prevents the penetration of oxygen through the ceramic to substrate, and to the modification methods of the TBC in general.
The purpose of the work is to determine the influence of presence and sequence of air and vacuum heat treatment on TBC properties particularly on oxidation resistance. TBC system was sprayed on Ni-based substrate and consists of APS NiCo-based bond coat (BC) and APS yttria-stabilized zirconia (YSZ) top coat. Isothermal heating test and thermal cycling test were used to determine effect of post treatment presence and sequence on interdiffusion between bond layer and substrate and microstructural characteristics of bond coat and ceramic top coat. Before and after tests cross-section of specimens was studied by SEM and EDX analyzes. Preliminary results showed the direct relationship between the presence and the sequence of post treatment on service life of APS TBC.
