Choosing a wear-resistant coating for a high-temperature brush seal

Leakage in the gas path of aircraft engines negatively affects operational efficiency. The problem of reducing leakage is among the most significant. Brush seal devices are widely used to reduce leakage, and considerable attention is paid to their improvement. To increase the service life of brush seals, coatings are applied that reduce seal wear. The use of ceramic coatings is promising; however, they have very low fracture toughness, which negatively affects wear resistance, especially under thermal cycling conditions. This article investigates the possibility of using a composite coating based on partially stabilized zirconia. The advantage of this coating over other ceramic coatings for tribotechnical purposes is its highest fracture toughness and the possibility of increasing it through microalloying with rare-earth elements. The effectiveness of alloying on fracture toughness indicators has been demonstrated by the kinetic microindentation method.
EDN: VKCJBD, https://elibrary/vkcjbd

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