Effect of Bondcoat Thickness on High Temperature Hot Corrosion of ZrO₂-8Y₂O₃Thermal Barrier Coating

Abstract

Thermal barrier coatings (TBCs) are widely used for industrial and aero turbines. The use of residual fuel oil is well known due to economic reasons, which causes hot corrosion. Hot corrosion over extended exposures reduces durability. Therefore, there is a requirement to develop new design approaches for TBCs in order to operate under hot corrosion environment. In this paper, the effect of bond coat thickness on the hot corrosion resistance was studied. Hot corrosion test were carried out in 50 wt.% Na2So4 + 50 wt.% V2O5 molten salt at 950• C for 50 hours. The characterizations of the coatings included X-ray diffraction analysis, scanning electron microscopy and optical microscope. Results indicated that TBCs with thick bond coat exhibited superior hot corrosion resistance to the TBCs with conventional bond coat.

Characterization of Alumina-Titania Coatings Produced by Atmospheric Plasma Spraying on 304 SS Steel

“…Microstructural characterization was carried out with scanning electron microscopy (SEM) [5,15]. Fig.…”

“…In atmospheric plasma spraying (APS), one of many plasma spray methods [3], a coated layer is formed on a substrate surface by spraying melted powders onto a substrate at a high speed using a high-temperature plasma jet [4,5]. Powder grains are transported within a carrier gas at high temperature and high speed, injected into plasma jet.…”

“…Introduction Plasma-sprayed ceramic coatings are widely used for structural applications in order to improve resistances to wear, friction, corrosion, and oxidization [1,2]. In atmospheric plasma spraying (APS), one of many plasma spray methods [3], a coated layer is formed on a substrate surface by spraying melted powders onto a substrate at a high speed using a high-temperature plasma jet [4,5]. Powder grains are transported within a carrier gas at high temperature and high speed, injected into plasma jet.…”

A Cyclic Voltammetry Study on Electrodeposition of Cu-Zn Alloy Films: Effect of Ultrasonication Time

“…There are many thin and thick film production techniques, each with its own advantages and drawbacks [16][17][18][19][20]. Among these techniques, electrodeposition has advantages of non-vacuum fabrication, ability of production at room temperature, aqueous deposition, low cost, versatility etc.…”

Phase Formation in Electrodeposited Cu-Zn Alloy Films Produced from Ultrasonicated Solutions

“…Thin and thick films can be produced by many different methods [16][17][18][19][20]. Electrodeposition or electrochemical deposition is a simple but advantageous technique of fabrication of thin and thick films.…”