Publication detail

Thermal Cyclic Behaviour of Conventional YSZ and Mullite-YSZ Thermal Barrier Coatings

JECH, D. KOMAROV, P. REMEŠOVÁ, M. DYČKOVÁ, L. SLÁMEČKA, K. RAVASZOVÁ, S. DVOŘÁK, K. ČELKO, L.

Original Title

Thermal Cyclic Behaviour of Conventional YSZ and Mullite-YSZ Thermal Barrier Coatings

Type

conference paper

Language

English

Original Abstract

Nowadays commonly used thermal barrier coatings (TBC) are based on yttria stabilized zirconia (YSZ). Addition of mullite phase into the YSZ coating can improve resulting high temperature properties. The contribution focuses on high temperature cyclic oxidation behaviour of two TBC systems with different top coats (TC) deposited by the means of atmospheric plasma spraying. The initial mullite-YSZ powder mixture consisted of 29 vol. % of mullite and 71 vol. % of YSZ. The conventional TBC system consisted of ~ 150 μm thick NiCoCrAlYHfSi bond coat (BC) and ~ 300 μm thick YSZ top coat. The experimental mullite-YSZ (MYSZ) TBC system consisted of ~ 150 μm thick NiCoCrAlYHfSi bond coat, ~ 100 μm thick YSZ interlayer and ~ 200 μm thick mullite-YSZ top coat. The experimental TBC proved higher lifetime, durability and phase stability and also lower grow rate of thermally grown oxide (TGO) compared to conventional TBC. Lifetime, phase stability and changes in the microstructure of TBCs after the furnace cyclic oxidation test were evaluated by the means of scanning electron microscopy equipped with EDX analyzer and X-ray diffraction techniques. Oxidation kinetics of TGO was calculated based on thickness determined utilizing digital image analysis.

Keywords

Cyclic oxidation; Atmospheric plasma spraying; Mullite, YSZ; Microstructure; Phase composition

Authors

JECH, D.; KOMAROV, P.; REMEŠOVÁ, M.; DYČKOVÁ, L.; SLÁMEČKA, K.; RAVASZOVÁ, S.; DVOŘÁK, K.; ČELKO, L.

Released

16. 11. 2020

Publisher

Trans Tech Publications Ltd

Location

Switzerland

ISBN

1662-9507

Periodical

Defect and Diffusion Forum

Year of study

45

State

Swiss Confederation

Pages from

417

Pages to

422

Pages count

6

URL

https://www.scientific.net/DDF.405.417

BibTex

@inproceedings{BUT166037,
  author="David {Jech} and Pavel {Komarov} and Michaela {Remešová} and Lucie {Dyčková} and Karel {Slámečka} and Simona {Ravaszová} and Karel {Dvořák} and Ladislav {Čelko}",
  title="Thermal Cyclic Behaviour of Conventional YSZ and Mullite-YSZ Thermal Barrier Coatings",
  booktitle="Metallography & Fractography 2019",
  year="2020",
  journal="Defect and Diffusion Forum",
  volume="45",
  pages="417--422",
  publisher="Trans Tech Publications Ltd",
  address="Switzerland",
  doi="10.4028/www.scientific.net/DDF.405.417",
  issn="1662-9507",
  url="https://www.scientific.net/DDF.405.417"
}