|
| Abstract No.: |
|
Scheduled at:
|
Wednesday, May 04, 2022, Hall D 4:00 PM
Young Professionals Session
|
|
| Title: |
Deposition of columnar structured thermal barrier coatings – investigation of parameters influencing lifetime and microstructure
|
|
| Authors: |
Jana Joeris* / Forschungszentrum Jülich GmbH, Germany
Robert Vassen / Forschungszentrum Jülich IEK-1, Deutschland
|
|
| Abstract: |
Turbine blades are subjected to high thermal and mechanical stresses during use and must be designed to withstand these harsh conditions. This goal is to be achieved by continuously optimising both, the materials and the coating processes. Single-crystalline superalloys serve as substrate material and are first coated with a metallic bond coat and then with a ceramic thermal barrier coating (TBC). The layers are produced by vacuum plasma spraying (VPS), suspension plasma spraying (SPS) and plasma spraying - physical vapour deposition (PS-PVD). The topcoat has a columnar microstructure, as these are characterised by high strain tolerance and consequently longer lifetimes. The system is further optimised by depositing another layer, the so-called oxide dispersion strenghtened layer (ODS), between the bondcoat and the topcoat. This consists of a metallic bondcoat powder mixed with alumina in order to avoid a mismatch of the thermal expansion coefficients of the TBC layers and consequently to reduce local stresses in the thermal barrier layer, which influence the service life.
|
|