Results 181 to 190 of about 1,038 (226)

Role of platinum in aluminide coatings

Surface and Coatings Technology, 1991
Abstract An investigation has been carried out to determine the role of platinum in aluminide coatings on selected nickel-based superalloys. Various microscopy, spectroscopy and diffraction techniques were used to characterize the microstructure. It is found that platinum improves the protective nature of the coating by (1) increasing its diffusional
H.M. Tawancy, N.M. Abbas, T.N. Rhys-Jones   +2 more
openaire   +1 more source

Characterization of the Degraded Microstructures of a Platinum Aluminide Coating

MRS Proceedings, 2001
AbstractTo investigate phase evolution of β-(Ni,Pt)Al/γ-(Ni3Al) in thermal barrier coating bond coat systems, specimens were subjected to 1200°C cyclic and isothermal heating. By removing the thermally grown oxide (TGO) after every 10 hours of heating, aluminum (Al) depletion from the bond coat was accelerated.
H.J. Kim, M.E. Walter
openaire   +1 more source

Use of experimental designs to evaluate formation of aluminide and platinum aluminide coatings

Surface and Coatings Technology, 1998
Abstract Aluminide and platinum-modified aluminide coatings are widely used for protecting nickel and cobalt-based superalloy gas turbine engine components from oxidation and corrosion. Conventional methods for producing these coatings include pack cementation, `above-the-pack', and CVD aluminization processes.
T.A Kircher, B.G McMordie, K Richards
openaire   +1 more source

Protective Aluminide Coatings for Refractory Metals

Oxidation of Metals, 2016
Refractory metals are promising materials for high-temperature applications. However, these materials exhibit low oxidation resistance at elevated temperatures. To overcome this problem, aluminum diffusion layers were applied to molybdenum, niobium, tantalum, and tungsten using a pack cementation process.
A. S. Ulrich, M. C. Galetz
openaire   +1 more source

Aluminide Coatings for Nickel Based Superalloys

Surface Engineering, 2004
A number of aluminide coatings have been developed which are modified by additional elements (noble metals, Cr and reactive elements such as Y and Hf). This results in a marked improvement in their corrosion resistance. In the present paper, aluminide coatings are reviewed. The hot corrosion and oxidation resistance of these coatings in laboratory and
M.R. Khajavi, M.H. Shariat, A. Pasha
openaire   +1 more source

Aluminide Coatings on 304 Stainless Steel

CORROSION 2013, 2013
Abstract USA Type 304 stainless steel coupons were aluminized at 650, 750 and 850°C for coating times in the 1-25 hour range via halide activated pack cementation. Mass gains per unit area and coating thicknesses were plotted as a function of time.
Kevin L. Smith, Armen Kutyan, Shaghik A. Abolian, Tom F. Krenek, Stephanie A. Salas, Vilupanur A. Ravi   +5 more
openaire   +1 more source

Protection of titanium aluminides by FeCrAlY Coatings

Materials and Corrosion, 1997
AbstractThe effectiveness of Fe+15%Cr+5%Al+0.3%Y coatings. produced by sputter ion plating, in improving the oxidation behaviour of γ‐2 Ti3Al at 800°C and γ‐TiAl at 900° and 1000°C. during cyclic exposures in air of up to 1000 hours duration, has been studied.
M. J. Bennett, S. J. Bull
openaire   +1 more source

Corrosion resistant modified aluminide coatings

Journal of Materials Engineering, 1988
The requirements for increasing operating temperatures in gas turbines and fuel fired energy systems is linked to the use of protective coatings able to improve oxidation and corrosion resistance of structural materials. MCrA1Y-type overlay coatings have been especially designed to protect airfoils and other hot gas component superalloys against hot ...
R. Streiff, D. H. Boone
openaire   +1 more source

High temperature oxidation of aluminide coatings

Materials Science and Engineering, 1987
Abstract Fe-17Cr (where the composition is in approximate weight per cent) alloys were aluminized using the pack cementation technique. They were then oxidized at a high temperature (800–1000 °C) in O 2 ( P O 2 = 1000 mbar ). Pure α-Al 2 O 3 scales were formed. They are abnormally thich and their morphology differs from that exhibited when Fe
Z El Majid, M Lambertin
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An investigation of pack-aluminide coating on steel

Oxidation of Metals, 1982
Aluminide coatings are known to protect steels from oxidation and corrosion in hydrocarbon and sulfur-bearing atmospheres. Pack cementation is ideally suited for forming these coatings on small intricate components, wherein a diffused layer is formed which is well bonded to the substrate.
R. Sivakumar, E. Janardhana Rao
openaire   +1 more source