期刊
SURFACE & COATINGS TECHNOLOGY
卷 203, 期 16, 页码 2307-2314出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2009.02.035
关键词
Thermal barrier coatings (TBC); Mechanical properties; Isothermal oxidation; Sensing indentation (nanoindentation); Scanning electron microscopy (SEM)
资金
- Spanish government CICYT [MAT 2003-06147, MAT 2007-64433]
- Comunidad de Madrid through the program ESTRUMAT-CM [MAT/77]
Thermal barrier coatings (TBC) are extensively used to protect metallic components in applications where the operating conditions include aggressive environment at high temperatures. Isothermal oxidation degrades the performance of these coatings, so this work analyses the mechanical properties (Young's modulus, E, and hardness, H) of TBC and its evolution after thermal exposure in air. ZrO2(Y2O3) top coat and NiCrAlY bond coating were air plasma sprayed onto an Inconel 600 Ni base alloy. The TBC were isothermally oxidized in air at 950 degrees C and 1050 degrees C for 72,144 and 336 h. Depth sensing indentation tests were carried out on the ceramic coating to evaluate E and H in the as-sprayed materials and after isothermal oxidation. An approach based on multiple tests at different loads was used to determine size independent apparent E an H. These mechanical properties, measured perpendicular to the surface, clearly decreased after isothermal oxidation as a consequence of microcracking within the ceramic coating. (C) 2009 Elsevier B.V. All rights reserved.
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