Oxidation behavior of porous NiAl prepared through reactive synthesis

Dong, H. X., Jiang, Y., He, Y. H., Zou, J., Xu, N. P., Huang, B. Y., Liu, C. T. and Liaw, P. K. (2010) Oxidation behavior of porous NiAl prepared through reactive synthesis. Materials Chemistry And Physics, 122 2-3: 417-423. doi:10.1016/j.matchemphys.2010.03.017


Author Dong, H. X.
Jiang, Y.
He, Y. H.
Zou, J.
Xu, N. P.
Huang, B. Y.
Liu, C. T.
Liaw, P. K.
Title Oxidation behavior of porous NiAl prepared through reactive synthesis
Journal name Materials Chemistry And Physics   Check publisher's open access policy
ISSN 0254-0584
Publication date 2010-08
Sub-type Article (original research)
DOI 10.1016/j.matchemphys.2010.03.017
Volume 122
Issue 2-3
Start page 417
End page 423
Total pages 7
Place of publication Lausanne, Switzerland
Publisher Elsevier Sequoia S.A.
Collection year 2011
Language eng
Formatted abstract
Porous NiAl alloys were prepared by die-pressing Ni + Al powder mixtures and vacuum sintering. The porous NiAl has a porosity of 50% with permeability of 1.1 × 103 m3 m−2 kPa−1 h−1. Cyclic oxidation of porous NiAl alloys was tested in air at 400, 600, 800 and 1000 °C, respectively. The oxidation kinetic curves were determined by weight gains of samples under different cyclic conditions. Through characterizing the formation of the oxide layers formed on the external and internal surfaces, it was found that the porous NiAl alloys exhibit excellent isothermal and cyclical oxidation resistance. Only very small peak for oxide phase can be detected by XRD even when the sample was oxidized at 800 °C for 160 h. The pore structure remains stable due to the formation of very thin and incontinuous oxide films at 800 °C. The oxide scales consist primarily of α-Al2O3 at 1000 °C. The porous NiAl has provided a better oxidation resistance in the given environment compared to porous 316L stainless steel (316LSS), showing a promising alternative to the 316LSS in severe environment.
Keyword Intermetallic compounds
Porous materials
Sintering
Oxidation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Centre for Microscopy and Microanalysis Publications
 
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Created: Sun, 27 Jun 2010, 00:03:35 EST