[Kovove materialy - Metallic materials]
    Mon - October 03, 2022 - 20:13 No. of hits : 1389472 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 39 (2001), Issue 5

Microstructure of plasma sprayed NiCrAlY coating isothermally exposed at 850 °C for 1, 10 and 100 hours
IZDINSKY, K., IVAN, J., ZEMANKOVA, M.
vol. 39 (2001), no. 5, pp. 316 - 330

Abstract
Results of structural studies performed with light microscopy and transmission electron microscopy on plasma sprayed NiCrAlY coatings isothermally exposed at 850 °C for 1, 10 and 100 hours are presented in this paper. The applied thermal treatment led to the decomposition of initial phases and to precipitation of α-Cr and γ'-Ni3Al. It is shown that the precipitation of α-Cr in the γ/γ' matrix obeys orientation relationships.
Complete transformation of amorphous oxides into crystalline structures takes place within the 100 hour exposure. Spinel structures with spacings close to γ-Al2O3 are mostly formed, however, Cr2O3 and CrO3 oxides were found too. No transformation to stable α-Al2O3 oxide has been observed.

Key words
NiCrAlY coatings, microstructure, thermal treatment, TEM studies

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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