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1 2011

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Effect of palladium diffusion in coatings deposited on the nickel based superalloy

Zagula-Yavarska M., Sieniawski J.

Archives of Materials Science and Engineering

2011

Vol. 52, nr 2

69-73

Purpose: In this paper the effect of palladium diffusion in coatings deposited on the surface of nickel based superalloy was evaluated. Design/methodology/approach: The palladium coatings 3 and 7 μm thick were deposited by the electroplating process on Inconel 713 LC Ni-base superalloy. The heat treatment of electroplated coatings at the temperature 1050°C for 2 h under argon atmosphere was performed. The microstructure investigations of the heat treated coatings were conduced 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 heat treated coatings was evaluated by Perthometer S2 MAHR equipment. Findings: The microstructure of 3 žm thick palladium electroplated coating after diffusion treatment consists of three phases: AlPd2, Ni3Al, Ni0,52Pd0,475. The increase of palladium thickness from 3 to 7 μm does not influence the phase composition of heat treated coatings. Heat treatment of palladium electroplating coatings increases the surface roughness parameter Ra. Research limitations/implications: The results will be used in the future investigations to explain the influence of palladium on the oxidation resistance of aluminide coatings. Practical implications: The palladium electroplating coatings after heat treatment and aluminizing process may be used as an alternative to platinum modified aluminide coatings as coatings for turbine blades of aircraft engines. Originality/value: The paper includes the results of microstructure and surface roughness investigations of palladium electroplating coatings 3 and 7 μm thick after diffusion treatment.