[Kovove materialy - Metallic materials]
    Thu - March 28, 2024 - 11:18 No. of hits : 1736367 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 42 (2004), Issue 5

Microstructure of air plasma sprayed NiAl coating isothermally exposed at 850 °C for 6 minutes
IZDINSKY, K., IVAN, J., ZEMANKOVA, M., CSUBA, A., MINAR, P., IZDINSKA, Z.
vol. 42 (2004), no. 5, pp. 316 - 328

Abstract
The microstructure of NiAl coating formed by air plasma spraying of ball-milled NiAl30 powder, isothermally exposed at 850 °C for 6 minutes in air, is studied in this paper. An exothermic reaction starting at 490 °C was determined by DTA within the heating period performed with the rate of 10 K.min-1. The reaction was recognized as a reaction synthesis restricted to local areas with appropriate chemical and phase composition. Metallic phases with the exception of some retained γ-Ni reacted to form NiAl phase. Average hardness of the coating increased from 130 to 450 HV 0.01. The local temperature increase induced by the exothermic reaction is responsible for the complete transformation of all amorphous Al2O3 oxides into crystalline oxides with spinel type structure.

Key words
NiAl coating, air-plasma spraying, microstructure, TEM studies, intermetallic phases, thermal analysis

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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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