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Verbesserung der Langzeit Oxidationsbeständigkeit von γ‐TiAl‐Werkstoffen
Author(s) -
Bobzin K.,
Schläfer T.,
Warda T.,
Brühl M.,
Linke T. F.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100827
Subject(s) - materials science , coating , cubic zirconia , brittleness , ceramic , layer (electronics) , thermal spraying , delamination (geology) , metallurgy , oxide , substrate (aquarium) , titanium , composite material , paleontology , oceanography , biology , subduction , tectonics , geology
In previous work, a thermal spray multilayer system consisting of Zirconia (ZrO 2 ) and MCrAlY top coat showed promising results regarding the oxidation behavior of the Gamma Titanium Aluminides substrates tested, which encouraged further research activities. Diffusion of substrate material was successfully inhibited by a ceramic Zirconia coating. A building up of a dense and stable oxide layer could be achieved by additional application of an MCrAlY top coat, leading to improved oxidation resistance and thus showing feasibility. In this work the main focus for development was put on enhancing adhesion and lowering residual stresses of the coatings in order to allow long term and cyclic testing without delamination taking place. Being a very brittle material, Gamma Titanium Aluminides require special surface treatment to enable roughening which is crucial for a strong mechanical bond between substrate and coating. Alternatives to conventional grit blasting as a standard preparation method were investigated. These were micro‐abrasive blasting and blasting at elevated temperature (≈300–550°C) to allow a more ductile behavior. The paper will highlight the implications by means of these measures and will also show the present development status of the multilayer system.