Ref.: MceMac17-001

Development of oxide-based coatings for extreme environments

Apresentador: Andre Renan Mayer

Autores (Instituição): Mayer, A.R.(Concordia University); Ettouil, F.B.(Concordia University); Moreau, C.(Concordia University); Stoyanov, P.(Concordia University);

Resumo:
Tribological interfaces within aircraft engines represent an exceptionally demanding domain due to their operation in high-temperature environments, a factor linked to the engines' efficiency and thus, a source of significant economic concern. It is well known that metallic oxides play an important role in tribological systems, mostly at high temperatures arising from surface oxidation. Consequently, a huge importance has been given to the lubricity of these oxides, mostly at high temperatures. Among them, molybdenum trioxide (MoO3) has shown to be a great candidate for coating development. Due to its high ionic potential, MoO3 exhibits excellent lubricating capabilities. Additionally, MoO3 possesses the highest oxidation state among molybdenum oxides, which contributes to its chemical stability. This study extends prior research on thermally sprayed metallic oxides, exploring MoO3 as a coating using suspension plasma spray (SPS). MoO3-based coatings are compared to baseline oxides via a ball-on-flat tribometer at varying temperatures and ex-situ analyses are performed to understand the interface and wear mechanisms. The research focuses on the potential of MoO3-based coatings to enhance tribological performance within aircraft engines, with implications for improved efficiency and cost savings.