T17 – Collaborative Research Centre 871: Regeneration of Complex Capital Goods

T17 - Increasing the service life of the outer air seal coating in the high-pressure turbine by developing a new adhesion promoter layer and applying it using thermal spraying

Outer air seal (OAS) coatings play a key role in the efficiency and operational safety of high-pressure turbines, as they stabilize clearance dimensions and minimize friction losses. Under real operating conditions, however, these coatings are subject to intense thermal and mechanical stress, which can lead to delamination or structural damage. Project T17 addresses this issue and investigates novel adhesion promoter coatings that are to be applied by thermal spraying in order to significantly increase the service life of the OAS coating.

Motivation

Despite their high potential, existing OAS coating systems are often susceptible to delamination and wear, especially under extreme temperature changes and friction contacts. An optimized bonding agent layer can specifically address these weaknesses and thus significantly improve the service life of the entire assembly. The aim of the transfer project is therefore to develop, apply, and validate a new bonding agent system that will be tested under realistic test conditions and qualified for use in engine maintenance in collaboration with the industrial partner.

Project Partners

MTU Maintenance Hannover GmbH

Responsible Institutes

The project is managed by the Institute of Materials Science .