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Oxidation behaviour of zirconium-doped NiAl coatings deposited on pure nickel

Zagula-Yavorska M., Sieniawski J., Romanowska J.

Archives of Materials Science and Engineering

2012

Vol. 58, nr 2

250--254

Purpose: In this paper the oxidation behaviour of zirconium-doped NiAl coatings deposited on a pure nickel was investigated. Design/methodology/approach: The zirconium-doped NiAl coatings were deposited by the chemical vapour deposition method on the pure nickel. The microstructure investigations of zirconium-doped aluminide coatings were performed by the use of an optical microscope (Nikon Epiphot 300) and a scanning electron microscope (Hitachi S-3400N) equipped with an Energy Dispersive Spectroscope EDS (VOYAGER of NORAN INSTRUMENTS). Oxidation behaviour at 1100ºC for 500 h in the air atmosphere in the furnace manufactured by Czylok company was evaluated. The phase composition of oxidized coatings were identified by the X-ray (ARL X’TRAX) diffractometer. Findings: The microstructures of zirconium-doped aluminide coatings consist of the β-NiAl, γ’-Ni3Al and γ-Ni(Al) phases. EDS analysis results of elements distribution indicate that zirconium is located at the distance of 13-16 μm from the surface after 1.5 h of aluminizing and randomly distributed in the whole coating after 5 h of aluminizing. Zirconium (less than 1% at) could contribute to a faster reduction of Al vacancies through fast diffusion towards the metal/oxide interface and increases adhesion of the oxide layer to the coating and this why the oxidation resistance improves. Research limitations/implications: The research involve microstructure, phase composition and oxidation behaviour investigation of zirconium doped aluminide coatings. Practical implications: The zirconium-doped aluminide coatings may be used as the cheaper alternative to platinum and palladium modified aluminide coatings for turbine blades of aircraft engines. Originality/value: The range of investigation includes microstructure, phase composition and oxidation behaviour of zirconium doped aluminide coating.