2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 6: Coatings, Cement, Rare Earth & Ferro-alloys
| Editors: | Kongoli F, Yildirim H, Hainer S, Hofmann K, Proske T, Graubner C.A., Albert B |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 200 pages |
| ISBN: | 978-1-987820-29-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Development of Substrate Preparation methods for Duplex Structure CVD-NiAl/EB-YSZ TBC Coatings
Andrzej Nowotnik1; Pawel Rokicki2; Slawomir Kotowski1; Grazyna Mrowka-Nowotnik1; Jan Sieniawski2;1RZESZOW UNIVERSITY OF TECHNOLOGY, Rzeszow, Poland; 2RZESZOW UNIVERSITY OF TECHNOLOGY, RESEARCH AND DEVELOPMENT LABORATORY FOR AEROSPACE MATERIALS, Rzeszow, Poland;
Type of Paper: Regular
Id Paper: 228
Topic: 19
Abstract:
The major objective of this paper is to present the methodology of sample preparation for duplex structure thermal barrier coatings (TBCs). The analysed TBC structure consists of metallic, nickel aluminide (NiAl) bond coat, deposited during chemical vapour deposition (CVD), and ceramic yttria partially-stabilized zirconia (YPSZ) top coat. The comprehensive procedure of sample preparation, including casting, turning, heat treatment, cleaning and polishing, also both deposition processes, were conducted in the Research & Development Laboratory for Aerospace Materials at RUT.
In order to provide maximum adhesion between layers, a polishing process of substrate and bond cold is applied. In case of flat samples, the polishing can be carried out on a disc polishing machine, however, for complex geometries (cylindrical samples, turbine blades), it has to be carried out differently.
The authors will utilize the centrifugal tumbler to remove the near surface sample layer (elimination of casting defects) and polish its surface. The CNC controlled sander customized for four-axis automatic blasting is used to obtain proper surface finish of bond coat (US4321310).