Air Plasma-Sprayed Yttria and Yttria-Stabilized Zirconia Thermal Barrier Coatings Subjected to Calcium-Magnesium-Alumino-Silicate (CMAS)

2014 ◽  
Vol 23 (6) ◽  
pp. 975-983 ◽  
Author(s):  
Wenshuai Li ◽  
Huayu Zhao ◽  
Xinghua Zhong ◽  
Liang Wang ◽  
Shunyan Tao
Keyword(s):  
Thermal Barrier Coatings ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Calcium Magnesium ◽  
Alumino Silicate ◽  
Plasma Sprayed

Failure Mechanism of Yttria Stabilized Zirconia Atmospheric Plasma Sprayed Thermal Barrier Coatings Subjected to Calcia-Magnesia-Alumino-Silicate Environmental Attack

2017 ◽  
Vol 270 ◽  
pp. 39-44 ◽  
Author(s):  
Ladislav Čelko ◽  
David Jech ◽  
Pavel Komarov ◽  
Michaela Remešová ◽  
Karel Dvořák ◽  
...  
Keyword(s):  
Thin Layer ◽  
Thermal Barrier Coatings ◽  
Yttria Stabilized Zirconia ◽  
Atmospheric Plasma ◽  
Thermal Barrier ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Alumino Silicate ◽  
Plasma Sprayed ◽  
Environmental Attack

The contribution focuses on the description of failure mechanism of atmospheric plasma sprayed multilayer thermal barrier coatings subjected to calcia-magnesia-alumino-silicate (CMAS) environmental attack. To identify exothermic and endothermic reactions which occurred during heating/cooling by means of calorimetry was also utilized initial yttria stabilized zirconia (YSZ) powder subsequently used for thermal spraying of multilayer thermal barrier coating system (TBCs), CMAS powder later on utilized for thin layer deposition and its mixture. Atmospheric plasma spray technique was used to produce the TBCs on a grit blasted nickel-based superalloy substrates, where CoNiCrAlY powder was used for deposition of a bond coat and YSZ powder was sprayed as a top coat. In accordance to the aerospace standard the thin layer of CMAS was deposited on as sprayed TBCs samples surface from its colloidal solution by paint brush method. Burner-rig test, utilizing direct propane-oxygen flame, was used for thermal cyclic exposition of the multilayer coated samples at the temperature of 1150 °C. Samples after thermal cyclic exposure test were investigated by means of materialographic analysis approaches. The significant reduction in life-time of CMAS coated YSZ top coat was observed due to lower melting point phase formation and molten silicate crystallization within the pores providing the spallation identified as a major mechanism of TBCs failure.

scholarly journals Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings

DYNA ◽  
2014 ◽  
Vol 81 (185) ◽  
pp. 13 ◽  
Author(s):  
Julián D. Osorio ◽  
Adrian Lopera-Valle ◽  
Alejandro Toro ◽  
Juan P. Hernández-Ortiz
Keyword(s):  
Phase Transformations ◽  
Thermal Barrier Coatings ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Plasma Sprayed
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