INFLUENCE OF HAFNIUM ON HIGH TEMPERATURE OXIDATION OF NiAl AND Ni3Al ALLOYS
Journal Title: Prace Instytutu Metalurgii Żelaza - Year 2018, Vol 70, Issue 2
Abstract
The results presented in this paper concern the modification of NiAl and Ni3Al alloys with reactive elements that in-crease their high temperature oxidation resistance. Literature data indicate that even trace additions of Hf to aluminide coatings significantly improve the resistance to oxidation in the range of 1100–1150°C, however the exact mechanism of its influence is not yet known. In order to determine the influence of various additions of Hf on high temperature oxidation of aluminide coatings, cyclic oxidation tests were performed at 1150°C of model NiAl and Ni3Al alloys with different Hf additions – from 0.25 wt.% to 1.5 wt.%. High resolution electron microscopy, as well as chemical composition analysis techniques, were applied to perform a detailed characterisation of the influence of Hf on the substructure, chemical and phase composition in the nano scale of oxide scales formed during high temperature oxidation.
Authors and Affiliations
Radosław Swadźba
Keywords
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- EP ID EP429668
- DOI 10.32730/imz.0137-9941.18.2.02
- Views 77
- Downloads 0
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