Papers by Keyword: NiAl

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Authors: Anders Engström, Johan Bratberg, Qing Cheng, Lars Höglund, Paul Mason
Abstract: This paper presents a brief review, followed by some new results from recent diffusion simulations in Ni-base superalloy systems, performed by means of a thermodynamic and kinetic modeling approach as taken in the commercial finite-difference code DICTRA. The DICTRA code solves the multi-component diffusion equations, combining assessed thermodynamic and kinetic data in order to determine the full composition dependent interdiffusion matrix. The link between fundamental physics based models and critically assessed data allows simulations to be performed with realistic conditions on alloys of practical importance. Emphasis in this paper is on modeling and simulation of interdiffusion occurring between NiAl coatings and Ni-base superalloy substrates. For this purpose we have used the so-called homogenization approach to diffusion in multi-phase systems, recently implemented into the DICTRA software. The simulation results have been validated against experimental data and the agreement is very satisfactory given the complexity of the problem.
Authors: Anne Marie Huntz, S.C. Tsaï, J. Balmain, K. Messaoudi, Bernard Lesage, C. Dolin
Authors: Christian Herzig, Sergiy V. Divinski, St. Frank, T. Przeorski
Authors: N.F. Afandi, Abreeza Manap, Halina Misran, S.Z. Othman, N.I.M. Pauzi
Abstract: NiAl is widely used for elevated temperature application because it gives better properties, especially in the gas turbine application. This study was done in order to investigate the effects of calcination temperature on NiAl and α-Al2O3 formation using gel combustion synthesis method. This method used fatty alcohol and fatty acid ester for producing NiAl powders. X-Ray diffraction patterns of calcined samples exhibited NiAl and α-Al2O3 at temperature 1050°C. Therefore, nanostructured NiAl-α- Al2O3 can be successfully produced with the gel combustion method using less expensive and more environmental friendly fatty alcohol and fatty acid ester as fuels.
Authors: Alexander Kirdyashkin, A.N. Guschin, A.S. Maznoy, S.S. Minaev, F.S. Palesskiy
Abstract: An investigation is performed of the filtrational combustion of gaseous hydrocarbons inside a spherical nozzle manufactured from porous Ni-Al material. The porous material is produced using the process of self-propagating high temperature synthesis, which allows an article of the desired configuration, chemical composition and porosity to be fabricated within a single technological stage. A combustion mode is demonstrated, wherein the combustion wave is localized inside the wall of the porous nozzle. Under this condition, up to 70 % of the total heat value of the fuel mixture is converted into IR flux radiated from the surface of the nozzle, with the maximum lying within the wavelength region 3–11 μm. A number of promising applications of new porous materials for designing new energy conversion devices are shown.
Authors: Dominique Poquillon, Djar Oquab, Daniel Monceau
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