Paper Title:
Intermetallic Ti-Al-Cr Based Layers and Zirconia Topcoats Deposited on Gamma Titanium Aluminides for Environmental Protection
  Abstract

. Intermetallic Ti-Al-Cr layers with small additions of Si, Zr, W, and Y were deposited on γ-TiAl specimens using magnetron sputtering. The oxidation behaviour of the coated γ-TiAl alloy was studied in the temperature range between 950 and 1000°C under cyclic oxidation conditions in air. Compared to the bare substrate material, the coatings exhibited higher oxidation resistance. During prolonged exposure the intermetallic layers degraded losing their capability to form a protective alumina scale. On coated γ-TiAl samples zirconia topcoats were deposited by electron beam physical vapour deposition. These thermal barrier coating systems exhibited lifetimes exceeding the maximum exposure length of 1000 1 h cycles at 950°C, but failed at 1000°C. Failure was caused by degradation of the bond coats resulting in spallation of the thermally grown oxides.

  Info
Periodical
Edited by
M. Heilmaier
Pages
497-502
DOI
10.4028/www.scientific.net/AMR.278.497
Citation
R. Braun, M. Fröhlich, C. Leyens, "Intermetallic Ti-Al-Cr Based Layers and Zirconia Topcoats Deposited on Gamma Titanium Aluminides for Environmental Protection", Advanced Materials Research, Vol. 278, pp. 497-502, 2011
Online since
July 2011
Export
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tadeusz Wierzchoń, Halina Garbacz, M. Ossowski
Abstract:The rapid progress in engineering enhances the demands set on materials requiring better mechanical properties, resistance to frictional...
3883
Authors: T. Wierzchon, M. Ossowski
Abstract:The rapid progress in engineering enhances the demands set on materials requiring better mechanical properties, resistance to frictional...
1287
Authors: Tomohiro Sasaki, Takahiro Yagi, Takehiko Watanabe, Atsushi Yanagisawa
Chapter 20: Surface Engineering & Coatings
Abstract:Diffusion treatments of TiAl-based alloys (49.1 at% Al) aluminum coated by thermal spray were carried out at the temperature range of...
2571
Authors: Widyastuti, Kusriantoko Parindra, Lilis Mariani, Hosta Ardhyananta, Sulistijono
Chapter 5: Surfaces, Coatings and Hardening of Materials for Industrial Application
Abstract:TBC (Thermal Barrier Coating) with YSZ-Al2O3/YSZ as top coat (TC) and MCrAlY alloy as bond coat (BC) marked as...
338