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1

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

Zagula-Yavarska M., Sieniawski J.

Archives of Materials Science and Engineering

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2011

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Vol. 52, nr 2

69-73

EN

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.

2

Mikrostruktura i odporność na utlenianie izotermiczne powłoki aluminiowej wytworzonej w niskoaktywnym procesie CVD na podłożu z nadstopu Inconel 713 LC

Yavorska M., Zielińska M., Kubiak K., Sieniawski J.

Archiwum Technologii Maszyn i Automatyzacji

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2010

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Vol. 30, nr 1

83-94

PL

Chemiczne osadzanie z fazy gazowej (CVD) jest jedną z metod wytwarzania aluminidkowych powłok dyfuzyjnych na podłożu z żarowytrzymałych nadstopów niklu i kobaltu. W artykule określono warunki technologiczne i termodynamiczne procesu CVD wytworzenia żaroodpornych powłok dyfuzyjnych na powierzchniach zewnętrznych pióra łopatek turbin silników lotniczych oraz na powierzchniach wewnętrznych kanałów chłodzących. Na podłożu z nadstopu inconel 713 LC wytworzono powłokę aluminidkową. Proces aluminiowania metodą CVD prowadzono za pomocą urządzenia IonBond z użyciem gazu reakcyjnego A1C13. Analiza składu chemicznego i fazowego wykazała, że głównym składnikiem fazowym mikrostruktury powłoki jest faza międzymetaliczna NiAl. Twardość na przekroju dyfuzyjnej powłoki aluminidkowej wynosi od 420 do 590 HV0,5. Badania odporności na utlenianie izotermiczne prowadzono w temperaturze 950°C w czasie 529 h w piecu komorowym w atmosferze powietrza. Stwierdzono, że powłokę aluminidkową na wewnętrznej powierzchni kanału chłodzącego łopatki, o wymiarach 2x30 mm i długości 20 mm, cechuje mniejsza prędkość utleniania niż materiału podłoża - inconelu 713 LC.

EN

Chemical vapour deposition (CVD) process is widely used to produce oxidation resistant coatings on Ni base superalloys. One of the feature of this method is the possibility of forming a diffusion coating on external and internal surfaces of the cooling channels of the aircraft turbine blades. The aluminide coating was formed on a commercial superalloy - Inconel 713 LC. The alumin-izing process - CVD was realized by the use of IonBond equipment and A1C13 - reacting gas. The investigations of chemical and phase composition of the surface layer of aluminized samples showed that the main constituent of microstructure is an intermetallic phase NiAl. The hardness of the coating measured on the cross section of the samples was from 420 to 590 HV0.5. The isothermal oxidation tests were performed at 950°C, during 529 h in the air atmosphere. It was proved that the developed aluminide layer on the internal surface of the cooling channel (with dimensions of 2x30 width and 20 mm length) of the turbine blades decreases the rate of oxidation of Inconel 713 LC superalloy.

3

Kvantitativní hodnocení degradace struktury niklových superslitin pomocí obrazové analýzy

Němec K., Podrábský T., Věchet S.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2007

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Vol. 321, z. 89

35-35

EN

Nickel-base superalloys, strengthened by the ´ phase dispersion, presents the typical precipitation strengthened alloys. In creep testing conditions, particles of secondary phase can be effectively blocks of dislocations movement at high temperatures as well. However, particles must be sufficiently stable with respect to coalescence, it means the average distance between them increases very slowly during creep. The aim of this work is the study of structural changes of the material Inconel 7I3 LC by image analysis. It is focused on short-time creep tests at temperatures 850°C and 950°C.

4

The influence comparison of creep testing and air traffic on microstructure of cast Ni - base superalloy inconel 713 LC

Němec K., Podrábský T., Věchet S., Juliš M., Pospíšilová S.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2003

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z. 76

177-182

EN

In the working conditions of the jet engines gas turbines of supersonic plane blades are loaded by the cycles, this process is the function of the time, temperature and stress. The blade are exposed to influence of degradable processes namely of the high-temperature corrosion, fatigue process and creep. As the result of short overloading as it happens for instance during the starts and landing, eventually in some other irregularities of the jet engine function, the increase of stress and temperature leads to the changes of microstructure and properties. The presented work is aimed at the study of structural changes of the material Inconel 7I3 LC subjected to short-time creep tests at s = 180 MPa and temperature 900°C and after air traffic. The thesis is a part of a complex project aimed at study of mechanical-structural characteristics of the polycrystalline nickel-base super alloy.