Improved oxidation resistance of thermal barrier coatings

Hot-corrosion behaviors of overlay-clad yttria-stabilized zirconia coatings in contact with vanadate–sulfate salts

“…Previous results demonstrated that oxidation of bond coat and thermal mismatch between ceramic coating and superalloy substrate were main factors that limit lifetimes of TBCs used in aviation gas turbines. [1][2][3][4][5][6] TBCs are also finding increasing application in land-based industrial engines and sea engines that are usually operated in corrosive environments or burn low-quality fuels containing impurities, such as vanadium, sodium, and sulfur. In this case, another failure mode, hot corrosion, becomes predominant and crucial to the lifetimes of TBCs.…”

Glass–ceramics as oxidation resistant bond coat in thermal barrier coating system

“…Preoxidation surface treatment of the bond coat performed under specific condition decreased the TGO growth rate resulting in improvement in TBC life compared with a conventional TBC system [6]. Application of a platinum-modified aluminide coating between the CoNiCrAlY bond coat and the ZrO 2 -Y 2 O 3 top coat improved the oxidation resistance of the TBC system at the high temperatures [7]. Pint et al found out that the lifetime of TBC can be improved by employing a more oxidation resistant bond coat [8].…”

The Oxidation Characteristics of the γ–γ′ Tie-Line Alloys of a Nickel-Base Superalloy

“…The second type of coating is called the overlay coating, which is based on NiCrAlY, CoNiCrAlY, and their derivatives; it is applied via chemical and physical vapour deposition. [3][4][5] Inter-diffusion occurs at the bond coat/substrate interface, as both families of coatings are not in thermodynamic equilibrium with their substrates. [1][2][3][4][5][6] The high amounts of refractory elements in newer alloys are nearer to their respective solubility limits (SL) in the alloys, making the alloys microstructurally less stable.…”