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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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Oxidation behaviour of palladium modified aluminide coatings deposited by CVD method on nickel-based superalloys under air atmosphere

Zagula-Yavorska M., Kubiak K., Sieniawski J.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 2

848--854

Purpose: In this paper the oxidation resistance of palladium modified aluminide coatings deposited by CVD method on nickel-based superalloy was evaluated. Design/methodology/approach: Palladium coatings 3 and 7 μm thick were deposited by the electroplating process. The heat treatment of electroplating coatings at the temperature 1050 °C for 2 h under argon atmosphere was performed. Low activity CVD aluminizing process of palladium heat treated coatings (3 and 7 μm thick) at the 1050°C for 8 h using IonB ond equipment was performed. Oxidation resistance was evaluated at 1100°C for 1000 h in air atmosphere using furnace of Czylok company. The microstructure investigations of palladium modified aluminide coatings were conducted by the use of optical microscope (Nikon Epiphot 300) and a scanning electron microscope (Hitachi S-3400N) equipped with an Energy Dispersive Spectroscope EDS (VOYAGER of NORAN INSTRUMENTS). The phase composition was identified by X-ray (ARL X’TRAX) diffractometer. The surface roughness parameter - Ra of modified aluminide coatings was evaluated by Perthometer S2 MAHR equipment. Findings: The microstructure of palladium modified aluminide coatings (3 and 7 μm thick) consists of (Ni,Pd)Al phase and two zones: outer and internal one. Low activity CVD aluminizing at 1050 °C for 8 h causes the increase of surface roughness parameter of modified coatings. The increase of platinum thickness from 3 to 7 μm causes a greater surface roughness of aluminide coatings. On the ground of the obtained results, it was found that palladium modification of aluminide coatings to increases the oxidation resistance of CMSX 4 Ni-base superalloy. Practical implications: The palladium modified aluminide coatings are used as an alternative for platinum modified aluminide coatings in turbine blades of aircraft engines. Originality/value: It was proved that palladium modification of aluminide coatings has a positive effect on the oxidation resistance of CMSX 4 Ni-base substrate.