A comparative study on the performance of suspension plasma sprayed thermal barrier coatings with different bond coat systems

• The performance of suspension plasma sprayed (SPS) yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) after isothermal treatment at 1150. °C was investigated. The NiCoCrAlY bond coats were applied by air plasma spray (APS) and high velocity oxygen fuel (HVOF) techniques. It was found that the microstructure of SPS TBCs depends on the surface morphology of the bond coat. The SPS TBCs with a rough APS bond coat exhibited a longer lifetime than those with a smooth HVOF bond coat. To understand this phenomenon, the evolution of the microstructure, mechanical properties and the residual stresses in the TBCs and TGO were systematically studied. Results showed that the surface roughness and oxidation behavior of the bond coat play dominant roles in the SPS TBC failure. © 2015.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

Nyckelord

Air; Coatings; Isotherms; Mechanical properties; Microstructure; Plasma jets; Plasma spraying; Sprayed coatings; Stresses; Surface roughness; Yttria stabilized zirconia; Zirconia

Bond coats; Evolution of the microstructure; High velocity oxygen fuel(HVOF); Isothermal exposures; Plasma-sprayed thermal barrier coating; Suspension plasma sprays; Thermal barrier coating (TBCs); Yttria-stabilized zirconias (YSZ)

Thermal barrier coatings

Produktions- och materialteknik

Manufacturing and materials engineering

Publikations- och innehållstyp

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