Progress in Novel Electrodeposited Bond Coats for Thermal Barrier Coating Systems

Abstract

The increased demand for high performance gas turbine engines has resulted in a continuous search for new base materials and coatings. With the significant developments in nickel-based superalloys, the quest for developments related to thermal barrier coating (TBC) systems is increasing rapidly and is considered a key area of research. Of key importance are the processing routes that can provide the required coating properties when applied on engine components with complex shapes, such as turbine vanes, blades, etc. Despite significant research and development in the coating systems, the scope of electrodeposition as a potential alternative to the conventional methods of producing bond coats has only been realised to a limited extent. Additionally, their effectiveness in prolonging the alloys’ lifetime is not well understood. This review summarises the work on electrodeposition as a coating development method for application in high temperature alloys for gas turbine engines and discusses the progress in the coatings that combine electrodeposition and other processes to achieve desired bond coats. The overall aim of this review is to emphasise the role of electrodeposition as a potential cost-effective alternative to produce bond coats. Besides, the developments in the electrodeposition of aluminium from ionic liquids for potential applications in gas turbines and the nuclear sector, as well as cost considerations and future challenges, are reviewed with the crucial raw materials’ current and future savings scenarios in mind.

Sol-gel zinc oxide nanoparticles: advances in synthesis and applications

“…The characterization of one-dimensional (1D) nanowires -like strong light-emitting, light absorption, and optical conductivity -can improve the light-emitting diodes (LEDs) performance, optical detectors, sensors, solar cells, field-effect transistors, and nanogenerators. For instance, nanowires of ZnO act as carrier conduction channels in photoelectric devices and reduce the carrier loss of light produced [145][146][147]. The LEDs' performance and nanowire-based detectors of photoelectric could be improved compared to tools based on thin films of polycrystalline [148,149].…”

Investigation of evaluated temperature oxidation for IN-738 LC superalloy turbine blade thermally coated by AL2O3 using slurry coating process

“…Nickel-base superalloys are popular as base materials for hot components in industrial gas turbines such as blades or vanes due to their superior mechanical performance and high-temperature oxidation resistance [8]. On the other hand, the combustion gases' existence generates a harsh environment, as well as hot oxidation, which is inevitable when alloys are utilized at high temperatures for long durations of time [9]. Two approaches.…”

“…Furthermore, the processing methods can offer the necessary coating characteristics for engine parts with complicated forms, like blades, turbine vanes, etc. [9].The study scope of electrodeposition has not been realized to a wide extent as an alternative to traditional strategies of generating bond coats as well as their effectiveness in increasing the life cycle. Due to their ability to create dense, adherent scales for Al 2 O 3 , Alumina coverings are commonly utilized as overlays and as a connection cover for TBCs on hot-gas turbine blades and other parts [16,17].…”