Temperature Measurements and Adhesion Properties of Plasma Sprayed Thermal Barrier Coatings

Abstract

Metal-ceramic coatings have been widely used for industrial applications, mainly in the gas turbine and diesel engine industries as thermal barrier coatings (TBCs). Conventional thermal barrier coatings consist of a metallic bond coat and an insulating ceramic topcoat. Temperatures and temperature gradients in the coating during plasma spraying play an important role on the final coating quality, especially the temperature of the particles just hitting the substrate surface. In this work, metal-ceramic coatings were applied on nickel-superalloy substrates. The temperatures of both the coating surface and substrate were measured during spraying. The adhesion of the coatings was determined using ASTM C 633 and correlated with the measured temperatures. Optical pyrometry and thermocouples were used to measure the interfacial and substrate temperatures, respectively. Temperature was shown to have a significant influence where lower interfacial temperatures were found to result in lower adhesion values.

Stability of rare‐earth‐doped spherical yttria‐stabilized zirconia synthesized by ultrasonic spray pyrolysis

“…As a TBC, calcia‐stabilized zirconia was used on the exhaust nozzle of the X‐15 manned rocket plane . Later, several ceramic coatings such as Al 2 O 3, mullite, CaO/MgO+ZrO 2, YSZ, CeO 2 +YSZ, La 2 Zr 2 O 7, etc. have been tested as TBC materials.…”

Study of Performance and Emission Analysis of Dual Biodiesel Fuelled on LHR Diesel Engine Supported by EGR System

“…The bond coat serves for the purpose of reducing the thermal stresses created between the top coat and the substrate due to difference in coefficient of thermal expansion. The bond coat also protects the substrate from oxidation and corrosion [28]. Generally metallic alloys are employed as TBC.…”

Einfluss einer PVD-Al-Zwischenschicht auf die Eigenschaften eines thermisch gespritzten Wärmedämmschichtsystems nach Temperaturwechselbelastung

“… einem metallischen Substrat, z. B. Ni‐Basis‐Superlegierungen für Turbinenanwendungen, Ti‐Legierungen für Flugzeugtriebwerke, Nb‐Legierungen für Schubdüsen oder Stahlelemente in Dieselmotoren [, ], einer metallischen Haftschicht mit einer Dicke von etwa 150 µm, in der Regel eine hochlegierte MCrAlY‐Legierung (M = Ni, Co, Fe oder eine Kombination) [, –], die eine hohe Passivierungsneigung in sauerstoffhaltiger Atmosphäre besitzt ( Tab. ), der thermisch gewachsenen Oxidschicht‐Schicht, die sich unter Einwirkung des durch die offenporöse keramische Deckschicht (4) eindringenden Sauerstoffs unter erhöhten Temperaturen auf der Grenzfläche zur Haftschicht bildet [–], einer keramischen Deckschicht, für die häufig Yttriumoxid‐stabilisiertes Zirkondioxid (YSZ, ZrO 2 /Y 2 O 3 , Masseanteil an Y 2 O 3 meist 8%) mit einer Schichtdicke von 250 µm bis 350 µm Anwendung findet [–]. …”