Papers by Keyword: Nickel Aluminides

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Authors: O. Coreño Alonso, J. Gerardo Cabañas-Moreno, J.J. Cruz-Rivera, G. Florez-Díaz, A. De Ita, S. Quintana-Molina, C. Falcony
Authors: Yuri M. Mishin, Diana Farkas
Authors: O. Coreño Alonso, J. Gerardo Cabañas-Moreno, J.J. Cruz-Rivera, H.A. Calderón, Minoru Umemoto, Koichi Tsuchiya, S. Quintana-Molina, C. Falcony
Authors: Chanon Bunmephiphit, Tawat Suriwong, Somchai Jiajitsawat, Nuchjira Dejang
Abstract: In this research, a Ni-Al solar absorber was successfully prepared by the flame spray technique with Ni-5 wt.%Al particles as a starting material. The Ni-5 wt.%Al particles were melted and sprayed onto the outer surface of a stainless steel 316L tube in order to form a Ni-Al composite coating. The phase, morphology and reflectance (R) spectrum of the Ni-Al solar absorber were characterized by X-ray Diffraction (XRD), a Scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) analyzer and an Ultraviolet-visible-near infrared spectrophotometer at the wavelength 300-2500 nm. The results revealed that the surface of the Ni-Al solar absorber was rough, and its cross section was overlapped layer by layer. The Ni-Al solar absorber was composed of Nickel (Ni) and aluminum (Al) phases. NiO and Al2O3 phases were also found on the surface. The chemical composition of the Ni-Al solar absorber was Ni (72.94 wt.%), Al (11.76 wt.%) and O (15.29 wt.%). The solar absorptance (α) of this solar absorber was 0.77. This demonstrates that a Ni-Al composite coating can be applied as a solar absorber material for solar collector at high operating temperatures.
Authors: Kaustubh N. Kulkarni
Abstract: Both FeAl and NiAl with B2 crystal structure are envisaged for their usage in high temperature applications and hence, availability of diffusion data in these intermetallics is crucial in designing their alloys and processes as well as deciding their in-service performance. A comprehensive overview of diffusion data available in B2 FeAl and NiAl and their alloys is provided in this article. Nearest neighbor vacancy jumps in B2 intermetallic lead to a local disorder in the lattice and hence it is not necessarily the unit step of diffusion in these structures. Several mechanisms of diffusion proposed in the literature are discussed including nearest neighbor jumps, next nearest neighbor jumps, six-jump vacancy cycle, triple defect and antisite bridge. Relevance of these mechanisms in FeAl and NiAl is discussed. An overview is given on the self-and solute diffusion and interdiffusion data available in both binary FeAl and NiAl. Due to wide solubility range of both FeAl and NiAl as well as their alloying requirements for improved properties, it becomes pertinent to study the multicomponent diffusion in the alloys based on these B2 itnermetallics. Hence, in the latter part of the article, various methods used for determining multicomponent diffusion data are reviewed. A detail overview is also provided on the diffusion studies available in literature on ternary alloys based on FeAl and NiAl with an emphasis on highlighting the diffusional interactions observed in these systems.
Authors: Christian Herzig, Sergiy V. Divinski
Authors: Victor Georgievich Shmorgun, A.I. Bogdanov, A.O. Taube
Abstract: The transformation of the structure, phase and chemical composition of the diffusion coatings of the system Al-Ni and Al-Cr-Ni at 1100 °C is studied. It is shown that the diffusion redistribution of Al by the coating thickness during the heat treatment is slower in the system Al-Cr-Ni than in the binary system Al-Ni.
Authors: Keisuke Uenishi, T. Kimata, Yoji Miyazaki, Kojiro F. Kobayashi
Authors: Y. Doi, Kenji Matsuki, H. Akimoto, Tetsuo Aida
Authors: Christoph Leyens, Ian G. Wright, Bruce A. Pint
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