Thermal spraying

Quantum mechanics

Sediment

Chemical vapor deposition

Phase (matter)

Engineering

Biology

Metallurgy

Materials science

Coating

Deposition (geology)

Ceramic

Plasma

Chemical engineering

Paleontology

Contact angle

Physics

Nanotechnology

Organic chemistry

Tetragonal crystal system

Yttria-stabilized zirconia

Composite material

Infiltration (HVAC)

Chemistry

Wetting

Cubic zirconia

Physical vapor deposition

Thermal barrier coating

Electron beam physical vapor deposition

Journal of the European Ceramic Society

Thermal barrier coatings (TBCs) produced by electron beam physical vapor deposition (EB-PVD) or plasma spray (PS) usually suffer from molten calcium-magnesium-alumino-silicate (CMAS) attack. In this study, columnar structured YSZ coatings were fabricated by plasma spray physical vapor deposition (PS-PVD). The coatings were CMAS-infiltrated at 1250 °C for short terms (1, 5, 30 min). The wetting and spreading dynamics of CMAS melt on the coating surface was in-situ investigated using a heating microscope. The results indicate that the spreading evolution of CMAS melt can be described in terms of two stages with varied time intervals and spreading velocities. Besides, the PS-PVD columnar coating (∼100 μm thick) was fully penetrated by CMAS melt within 1 min. After the CMAS attack for 30 min, the original feathered-YSZ grains (tetragonal phase) in both PS-PVD and EB-PVD coatings were replaced by globular shaped monoclinic ZrO2 grains in the interaction regions.

Wetting, infiltration and interaction behavior of CMAS towards columnar YSZ coatings deposited by plasma spray physical vapor